Some standard content:
Chemical Industry Standard of the People's Republic of China
Industrial Polyaluminium Chloride
Subject Content and Scope of Application
HG/T 2677--95
This standard specifies the technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of industrial polyaluminium chloride. This standard applies to industrial polyaluminium chloride. This product is mainly used in industrial water treatment, paper sizing, precision casting, petroleum, chemical industry, dyes and other industries.
Molecular formula: EAl(OH), Clsnn
2 Reference standards
Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents GB/T 601
Preparation of standard solutions for determination of impurities in chemical reagents GB/T 602
GB/T 603
Preparation of preparations and products used in test methods for chemical reagents GB 1250
Expression and determination methods of limit values GB/T 3049
GB/T 4472
GB/T 6678
GB/T 6682
General method for determination of iron content in chemical products General rules for determination of density and relative density of chemical products General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories Plastic woven bags
GB 8946
GB/T9724 General Rules for Determination of pH Value of Chemical Reagents 3 Technical Requirements
O-phenanthroline spectrophotometric method
3.1 Appearance: Liquid products are colorless or light yellow-brown liquids; solid products are yellow or gray flake, granular or powdery solids. 3.2 Industrial polyaluminium chloride shall meet the requirements of the following table:
Aluminium oxide (Al,O) content, %
Density (20C) g/cm
Basicity, %
pH value (10g/l.solution)
Sulfate (in S), %
Iron (Fe) content, %
Acid-insoluble matter content, %
Superior product
Note: "If the user has other requirements for alumina content and basicity, they can be agreed upon separately." Approved by the Ministry of Chemical Industry of the People's Republic of China on April 5, 1995 562
First-class products
10. 0~~11. 0
Qualified products
All US standards and industry data free download standards
First-class products
Qualified products
1996-01-01 implementation
4 Test methods
HG/T 2677-- 95
The reagents and water used in this standard, unless otherwise specified, refer to analytical pure reagents and the third-grade water specified in GB/T6682. The standard solutions, impurity standard solutions, preparations and products required for the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603. 4.1 Determination of aluminum oxide content
4.1.1 Summary of the method
Add nitric acid and a known amount of excess EDTA standard titration solution to the sample to completely complex the aluminum. When the pH is about 6, back titrate with zinc standard solution using xylenol orange as an indicator. 4.1.2 Reagents and materials
4.1.2.1 Nitric acid (GB/T626) solution: 1+12; 4.1.2.2 Disodium ethylenediaminetetraacetic acid (GB/T1401) standard titration solution: c (EDTA) about 0.048~0.049 mol/L; 4.1.2.3 Zinc standard titration solution: c (Zn) about 0.02 mol/L. Weigh 1.628g of reference zinc oxide (GB1260) burned to constant weight at 800℃ (accurate to 0.0002g), moisten with a small amount of water, add 1+1 hydrochloric acid (GB/T622) solution until completely dissolved. Transfer to a 1L volumetric flask and dilute to scale with water;
4.1.2.4 Sodium acetate (GB/T693) solution: 272g/L; Xylenol orange indicator solution: 1g/L.
4.1.3 Analysis steps
Weigh about 10g (liquid) or about 4g (solid) sample (accurate to 0.001g), dissolve in water, transfer all to a 500mL volumetric flask, dilute to scale with water, and shake well. Use a pipette to transfer 20mL of this test solution to a 250mL conical flask. Add 2mL nitric acid solution and boil for 1min. After cooling, add 20mL of DTA standard titration solution with a pipette. Adjust the pH value to about 3 with sodium acetate solution (check with pH test paper) and boil for about 2 minutes. After cooling, add about 10mL of sodium acetate solution and 2-5 drops of xylenol orange indicator solution. Titrate with zinc standard titration solution. The end point is when the solution color changes from light yellow to slightly red. Take another 250mL conical flask, add about 20mL of water, and perform a blank test as above starting from "add 2mL of nitric acid". 4.1.4 Expression of analytical results
The aluminum oxide (Al,O.) content X expressed as mass percentage is calculated according to formula (1): Xx0. 051 0x10X 0.93)...
m×500
Where: V. —Volume of zinc standard titration solution consumed in blank test, mL; V, —Volume of zinc standard titration solution consumed in test solution, mL; c —Actual concentration of zinc standard titration solution, mol/L; Mass of sample, g;
Iron content determined in Article 4.6;
Mass of aluminum oxide (Al,O,) expressed in grams equivalent to 1.00mL zinc standard titration solution [c (Zn) 1.000mol/LJ;
Coefficient of iron conversion into aluminum oxide.
4.1.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.3%. 4.2 Determination of density of liquid polyaluminium chloride
Determine according to the density meter method specified in GB/T4472. 4.3 Determination of basicity
4.3.1 Summary of method
HG/T 2677-95
After boiling and decomposing the sample with hydrochloric acid, mask it with potassium fluoride and titrate it with sodium hydroxide standard titration solution using phenolphthalein as indicator. 4.3.2 Reagents and materials
4.3.2.1 Potassium fluoride (GB/T1271) solution: 500g/L; 4.3.2.2 Hydrochloric acid (GB/T622) standard titration solution: c (HCl) about 0.5mol/L; 4.3.2.3 Sodium hydroxide (GB/T629) standard titration solution: c (NaOH) about 0.5mol/L; 4.3.2.4 Phenol (GB/10729) indicator solution: 10g/1. 4.3.3 Analysis steps
Weigh about 2g (liquid) or about 0.6g (solid) sample (accurate to 0.001g), cover it in a 250ml conical flask, add about 25ml of water, use a pipette to transfer 25ml of hydrochloric acid standard titration solution, add it to the conical flask, cover it with a surface III, heat it in a water bath for 10min, and cool it to room temperature. Add 25mL of potassium fluoride solution and 5 drops of phenolphthalein indicator solution, and immediately titrate with sodium oxide standard titration solution. The end point is when the solution turns slightly red.
Use another 250ml conical flask, add 25ml of water, and conduct a blank test. 4.3.4 Expression of analytical results
The basicity X expressed in mass percentage is calculated according to formula (2): Xx -VoV)XcX0.016 99×100
169. 9(V.--V)c
Wherein: V,-volume of standard sodium hydroxide solution consumed in blank test, mL; V-volume of standard sodium hydroxide solution consumed in test solution, mL; -actual concentration of standard sodium hydroxide solution, mol/L; mmass of sample, g;
X,~4.1 content of aluminum oxide measured, %; (2)
The mass of aluminum oxide (Al,O,) expressed in grams equivalent to 1.00mL standard sodium hydroxide solution [c (Na(H)=1.000mol/L)].
4.3.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 1%. 4.4 Determination of pH value
4.4.1 Summary of method
Same as GB/T 9724.
4.4.2 Analysis steps
Weigh 1.0g of sample, transfer it into a 100mL volumetric flask, and dilute it to the scale with water. The pH value of the prepared solution is determined according to GB/T9724. 4.5 Determination of sulfate content
4.5.1 Summary of method
Add hydrochloric acid solution to the sample and heat it to decompose it. After filtering, add chlorination solution to form a precipitate with sulfate, filter, wash, dry, burn and weigh.
4.5.2 Reagents and materials
4.5.2.1 Hydrochloric acid (GB/T622) solution: 1+1; 4.5.2.2 Barium chloride (BaCl2·2H,O) (GB/T652) solution: 50g/L; 4.5.2.3 Silver nitrate (GB/T670) solution: 17g/L. 4.5.3 Analysis steps
Weigh about 5g (liquid) or about 2g (solid) sample (accurate to 0.01g), put it into a 250mL beaker, add 8mL hydrochloric acid solution and 100ml water, heat to a slight boil for 10min, filter it with medium-speed filter paper into a 400mL beaker while it is still hot, wash with water until the filtrate is about 200mL, heat the filtrate to boiling, add 10ml barium chloride solution dropwise while it is still hot and stir, and keep it warm in a water bath (above 90C) for 2h. Filter with slow quantitative filter paper, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), put the filter paper and precipitate into a crucible that has been kept at constant weight at 800±25℃, dry and ash, put into a high-temperature furnace, and burn at 800±25℃ to constant weight. 4.5.4 Expression of analysis results
Sulfate content (in terms of S) expressed as a mass percentage X: Calculate according to the following formula: X.=
-mass of the sample in g;
rti: m,--
m-barium sulfate precipitate and crucible mass in g;
m--—mass of the sample in g;
(m2-m,)X0. 142
0.412——Coefficient for converting sulfuric acid precipitate into sulfate (SO4). 4.5.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.3%. 4.6 Determination of iron content
4.6.1 Summary of method
GB/T3049 Article 2.
4.6.2 Reagents and materials
Same as GB/T3049 Article 3.
4.6.3 Instruments and equipment
Same as GB/T3049 Article 4.
4.6.4 Analysis steps
4.6.4.1 Drawing of working curve
According to Article 5.3 of GB/T3049, select the absorption cell and the corresponding amount of iron standard solution according to the iron content of the sample, and draw the working curve. 4.6.4.2 Preparation of test solution
Weigh about 10g (liquid) or about 3g (solid) sample (accurate to 0.01g), place it in a 250mL beaker, add 10mL (1+1) hydrochloric acid and appropriate water, heat to dissolve, transfer all to a 500mL volumetric flask, dilute with water to the scale, shake well. Filter, use a pipette to transfer a certain volume of filtrate, place it in a 100mL volumetric flask, and add water to about 60mL. 4.6.4.3 Preparation of blank test solutionwwW.bzxz.Net
Except for not adding sample, other operations are the same as Article 4.6.4.2. 4.6.4.4 Determination
According to the provisions of Article 5.4 of GB/T3049, the operation shall be started from "add water to about 60 mL if necessary". 4.6.5 Expression of analysis results
Iron (Fe) content X expressed as mass percentage. Calculate according to formula (4): (m --mo)×10\
-The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: m\
-The amount of iron found from the working curve based on the measured absorbance of the reagent blank solution, mg, m
m—-Sample mass, g;
V—Volume of the test solution transferred, mL.
4.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.002%. 4
4.7 Determination of acid-insoluble matter content
4.7.1 Reagents and materials
4.7.1.1 Hydrochloric acid (GB/T622) solution: 1+1. HG/T 2677-95
4.7.1.2 Silver nitrate (GB/T670) solution: 17g/L. 4.7.2 Instruments and equipment
Crucible filter: filter plate pore size 5~15pm
4.7.3 Analysis steps
Weigh about 5g of sample (accurate to 0.01g), place in a 250mL beaker, add 200ml of water and 15mL of hydrochloric acid, heat and boil for 10min to dissolve the sample, and let it stand for 1h. 105-110℃ dried to constant weight crucible filter, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), dry crucible filter at 105-110℃ to constant weight. 4.7.4 Expression of analysis results
The acid insoluble content X expressed as mass percentage is calculated as follows: X, = mz = mx100
Where: m-mass of crucible filter, g;
m2-mass of crucible filter and insoluble matter, g; m-test material Mass, g.
4.7.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.05%. 5 Inspection rules
5.1 Industrial polyaluminium chloride shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial polyaluminium chloride shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, net weight grade, batch number or production date, product quality certificate of compliance with this standard and this standard number. 5.2 The user unit has the right to accept the industrial polyaluminium chloride received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 20t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. For solid products, when sampling, insert the sampler vertically from the center of the package to three-quarters of the depth of the material layer for sampling. After mixing the collected samples, reduce them to about 500g by quartering method, and pack them into two clean and dry wide-mouth bottles with ground stoppers, and seal them. For liquid products, use glass sampling tubes to collect samples from the upper, middle and lower parts of each barrel or tank car, and take out no less than 500mL of samples in total, place them in a clean and dry container, mix them evenly, and pack them into two polyethylene bottles, and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for 1 month for future reference.
5.5 If one of the indicators of the inspection results does not meet the requirements of this standard, sampling should be carried out from twice the amount of packaging. If the inspection results do not meet the requirements of this standard even if only one indicator does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 5.7 The rounded value comparison method specified in GB/T1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial polyaluminium chloride should be firmly and clearly marked. The content includes: manufacturer name, product name, trademark, net weight, grade, batch number or production date and this standard number.
6.2 Industrial polyaluminium chloride solid products are double-layered. The inner bag is a vinyl film bag with a bag thickness of not less than 0.1mm. The outer bag is a plastic woven bag (select the corresponding model according to the provisions of GB8946). Each batch of packaging materials should be sampled and inspected, and its performance and inspection methods should comply with the provisions of 566
wHG/T2677-95
GB8946. The net weight of each bag is 25kg, 40kg or 50kg. Liquid products are stored and transported in plastic barrels or glass fiber reinforced plastic tank trucks. The net weight of each barrel is 25kg, 40kg or 50kg. 6.3 The inner bag of the package is sealed with two ties or heat seals to ensure a tight seal. The outer bag is sewn with a bag sewing machine, with a stitch length of no more than 10mm, neat stitches, uniform stitch length, and no leaks or skipped stitches. The packaging barrel cover should use an acid- and alkali-resistant elastic gasket and be firmly sealed. 6.4 The packaging of industrial polyaluminium chloride products should be kept intact during transportation to prevent leakage and heat and moisture. 6.5 Industrial polyaluminium fluoride products should be stored in a cool, ventilated and dry warehouse. Additional Notes:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Liaoning Jinxi Nanpiao Chemical Plant, Sichuan Chengdu Shurong Water Purifier Plant, and Hebei Huanghua Chemical Industry Xinfa Co., Ltd. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang, Wang Fenglin, Luo Quan, and Wang Baozhong. This standard is not equivalent to the Japanese Industrial Standard JIS K1457-78 (84) "Polyaluminium chloride for water supply systems".O) (GB/T652) solution: 50g/L; 4.5.2.3 Silver nitrate (GB/T670) solution: 17g/L. 4.5.3 Analysis steps
Weigh about 5g (liquid) or about 2g (solid) sample (accurate to 0.01g), put it into a 250mL beaker, add 8mL hydrochloric acid solution and 100ml water, heat to a slight boil for 10min, filter it with medium-speed filter paper in a 400mL beaker while it is hot, wash it with water until the filtrate is about 200mL, heat the filtrate to boiling, add 10ml barium chloride solution while it is hot and stir, and keep it warm in a water bath (above 90C) for 2h. Filter with slow quantitative filter paper, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), put the filter paper and precipitate into a crucible that has been kept at constant weight at 800±25℃, dry and ash, put into a high-temperature furnace, and burn at 800±25℃ to constant weight. 4.5.4 Expression of analysis results
Sulfate content (in terms of S) expressed as a mass percentage X: Calculate according to the following formula: X.=
-mass of the sample in g;
rti: m,--
m-barium sulfate precipitate and crucible mass in g;
m--—mass of the sample in g;
(m2-m,)X0. 142
0.412——Coefficient for converting sulfuric acid precipitate into sulfate (SO4). 4.5.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.3%. 4.6 Determination of iron content
4.6.1 Summary of method
GB/T3049 Article 2.
4.6.2 Reagents and materials
Same as GB/T3049 Article 3.
4.6.3 Instruments and equipment
Same as GB/T3049 Article 4.
4.6.4 Analysis steps
4.6.4.1 Drawing of working curve
According to Article 5.3 of GB/T3049, select the absorption cell and the corresponding amount of iron standard solution according to the iron content of the sample, and draw the working curve. 4.6.4.2 Preparation of test solution
Weigh about 10g (liquid) or about 3g (solid) sample (accurate to 0.01g), place it in a 250mL beaker, add 10mL (1+1) hydrochloric acid and appropriate water, heat to dissolve, transfer all to a 500mL volumetric flask, dilute with water to the scale, shake well. Filter, use a pipette to transfer a certain volume of filtrate, place it in a 100mL volumetric flask, and add water to about 60mL. 4.6.4.3 Preparation of blank test solution
Except for not adding sample, other operations are the same as Article 4.6.4.2. 4.6.4.4 Determination
According to the provisions of Article 5.4 of GB/T3049, the operation shall be started from "add water to about 60 mL if necessary". 4.6.5 Expression of analysis results
Iron (Fe) content X expressed as mass percentage. Calculate according to formula (4): (m --mo)×10\
-The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: m\
-The amount of iron found from the working curve based on the measured absorbance of the reagent blank solution, mg, m
m—-Sample mass, g;
V—Volume of the test solution transferred, mL.
4.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.002%. 4
4.7 Determination of acid-insoluble matter content
4.7.1 Reagents and materials
4.7.1.1 Hydrochloric acid (GB/T622) solution: 1+1. HG/T 2677-95
4.7.1.2 Silver nitrate (GB/T670) solution: 17g/L. 4.7.2 Instruments and equipment
Crucible filter: filter plate pore size 5~15pm
4.7.3 Analysis steps
Weigh about 5g of sample (accurate to 0.01g), place in a 250mL beaker, add 200ml of water and 15mL of hydrochloric acid, heat and boil for 10min to dissolve the sample, and let it stand for 1h. 105-110℃ dried to constant weight crucible filter, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), dry crucible filter at 105-110℃ to constant weight. 4.7.4 Expression of analysis results
The acid insoluble content X expressed as mass percentage is calculated as follows: X, = mz = mx100
Where: m-mass of crucible filter, g;
m2-mass of crucible filter and insoluble matter, g; m-test material Mass, g.
4.7.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.05%. 5 Inspection rules
5.1 Industrial polyaluminium chloride shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial polyaluminium chloride shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, net weight grade, batch number or production date, product quality certificate of compliance with this standard and this standard number. 5.2 The user unit has the right to accept the industrial polyaluminium chloride received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 20t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. For solid products, when sampling, the sampler shall be inserted vertically from the center of the package to three-quarters of the depth of the material layer for sampling. After mixing the collected samples, reduce them to about 500g by quartering method, and pack them into two clean and dry wide-mouth bottles with ground stoppers, and seal them. For liquid products, use glass sampling tubes to collect samples from the upper, middle and lower parts of each barrel or tank car, and take out no less than 500mL of samples in total, place them in a clean and dry container, mix them evenly, and pack them into two polyethylene bottles, and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for 1 month for future reference.
5.5 If one of the indicators of the inspection results does not meet the requirements of this standard, sampling should be carried out from twice the amount of packaging. If the inspection results do not meet the requirements of this standard even if only one indicator does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 5.7 The rounded value comparison method specified in GB/T1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial polyaluminium chloride should be firmly and clearly marked. The content includes: manufacturer name, product name, trademark, net weight, grade, batch number or production date and this standard number.
6.2 Industrial polyaluminium chloride solid products are double-layered. The inner bag is a vinyl film bag with a bag thickness of not less than 0.1mm. The outer bag is a plastic woven bag (select the corresponding model according to the provisions of GB8946). Each batch of packaging materials should be sampled and inspected, and its performance and inspection methods should comply with the provisions of 566
wHG/T2677-95
GB8946. The net weight of each bag is 25kg, 40kg or 50kg. Liquid products are stored and transported in plastic barrels or glass fiber reinforced plastic tank trucks. The net weight of each barrel is 25kg, 40kg or 50kg. 6.3 The inner bag of the package is sealed with two ties or heat seals to ensure a tight seal. The outer bag is sewn with a bag sewing machine, with a stitch length of no more than 10mm, neat stitches, uniform stitch length, and no leaks or skipped stitches. The packaging barrel cover should use an acid- and alkali-resistant elastic gasket and be firmly sealed. 6.4 The packaging of industrial polyaluminium chloride products should be kept intact during transportation to prevent leakage and heat and moisture. 6.5 Industrial polyaluminium fluoride products should be stored in a cool, ventilated and dry warehouse. Additional Notes:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Liaoning Jinxi Nanpiao Chemical Plant, Sichuan Chengdu Shurong Water Purifier Plant, and Hebei Huanghua Chemical Industry Xinfa Co., Ltd. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang, Wang Fenglin, Luo Quan, and Wang Baozhong. This standard is not equivalent to the Japanese Industrial Standard JIS K1457-78 (84) "Polyaluminium chloride for water supply systems".O) (GB/T652) solution: 50g/L; 4.5.2.3 Silver nitrate (GB/T670) solution: 17g/L. 4.5.3 Analysis steps
Weigh about 5g (liquid) or about 2g (solid) sample (accurate to 0.01g), put it into a 250mL beaker, add 8mL hydrochloric acid solution and 100ml water, heat to a slight boil for 10min, filter it with medium-speed filter paper in a 400mL beaker while it is hot, wash it with water until the filtrate is about 200mL, heat the filtrate to boiling, add 10ml barium chloride solution while it is hot and stir, and keep it warm in a water bath (above 90C) for 2h. Filter with slow quantitative filter paper, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), put the filter paper and precipitate into a crucible that has been kept at constant weight at 800±25℃, dry and ash, put into a high-temperature furnace, and burn at 800±25℃ to constant weight. 4.5.4 Expression of analysis results
Sulfate content (in terms of S) expressed as a mass percentage X: Calculate according to the following formula: X.=
-mass of the sample in g;
rti: m,--
m-barium sulfate precipitate and crucible mass in g;
m--—mass of the sample in g;
(m2-m,)X0. 142
0.412——Coefficient for converting sulfuric acid precipitate into sulfate (SO4). 4.5.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.3%. 4.6 Determination of iron content
4.6.1 Summary of method
GB/T3049 Article 2.
4.6.2 Reagents and materials
Same as GB/T3049 Article 3.
4.6.3 Instruments and equipment
Same as GB/T3049 Article 4.
4.6.4 Analysis steps
4.6.4.1 Drawing of working curve
According to Article 5.3 of GB/T3049, select the absorption cell and the corresponding amount of iron standard solution according to the iron content of the sample, and draw the working curve. 4.6.4.2 Preparation of test solution
Weigh about 10g (liquid) or about 3g (solid) sample (accurate to 0.01g), place it in a 250mL beaker, add 10mL (1+1) hydrochloric acid and appropriate water, heat to dissolve, transfer all to a 500mL volumetric flask, dilute with water to the scale, shake well. Filter, use a pipette to transfer a certain volume of filtrate, place it in a 100mL volumetric flask, and add water to about 60mL. 4.6.4.3 Preparation of blank test solution
Except for not adding sample, other operations are the same as Article 4.6.4.2. 4.6.4.4 Determination
According to the provisions of Article 5.4 of GB/T3049, the operation shall be started from "add water to about 60 mL if necessary". 4.6.5 Expression of analysis results
Iron (Fe) content X expressed as mass percentage. Calculate according to formula (4): (m --mo)×10\
-The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: m\
-The amount of iron found from the working curve based on the measured absorbance of the reagent blank solution, mg, m
m—-Sample mass, g;
V—Volume of the test solution transferred, mL.
4.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.002%. 4
4.7 Determination of acid-insoluble matter content
4.7.1 Reagents and materials
4.7.1.1 Hydrochloric acid (GB/T622) solution: 1+1. HG/T 2677-95
4.7.1.2 Silver nitrate (GB/T670) solution: 17g/L. 4.7.2 Instruments and equipment
Crucible filter: filter plate pore size 5~15pm
4.7.3 Analysis steps
Weigh about 5g of sample (accurate to 0.01g), place in a 250mL beaker, add 200ml of water and 15mL of hydrochloric acid, heat and boil for 10min to dissolve the sample, and let it stand for 1h. 105-110℃ dried to constant weight crucible filter, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), dry crucible filter at 105-110℃ to constant weight. 4.7.4 Expression of analysis results
The acid insoluble content X expressed as mass percentage is calculated as follows: X, = mz = mx100
Where: m-mass of crucible filter, g;
m2-mass of crucible filter and insoluble matter, g; m-test material Mass, g.
4.7.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.05%. 5 Inspection rules
5.1 Industrial polyaluminium chloride shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial polyaluminium chloride shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, net weight grade, batch number or production date, product quality certificate of compliance with this standard and this standard number. 5.2 The user unit has the right to accept the industrial polyaluminium chloride received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 20t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. For solid products, when sampling, insert the sampler vertically from the center of the package to three-quarters of the depth of the material layer for sampling. After mixing the collected samples, reduce them to about 500g by quartering method, and pack them into two clean and dry wide-mouth bottles with ground stoppers, and seal them. For liquid products, use glass sampling tubes to collect samples from the upper, middle and lower parts of each barrel or tank car, and take out no less than 500mL of samples in total, place them in a clean and dry container, mix them evenly, and pack them into two polyethylene bottles, and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for 1 month for future reference.
5.5 If one of the indicators of the inspection results does not meet the requirements of this standard, sampling should be carried out from twice the amount of packaging. If the inspection results do not meet the requirements of this standard even if only one indicator does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 5.7 The rounded value comparison method specified in GB/T1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial polyaluminium chloride should be firmly and clearly marked. The content includes: manufacturer name, product name, trademark, net weight, grade, batch number or production date and this standard number.
6.2 Industrial polyaluminium chloride solid products are double-layered. The inner bag is a vinyl film bag with a bag thickness of not less than 0.1mm. The outer bag is a plastic woven bag (select the corresponding model according to the provisions of GB8946). Each batch of packaging materials should be sampled and inspected, and its performance and inspection methods should comply with the provisions of 566
wHG/T2677-95
GB8946. The net weight of each bag is 25kg, 40kg or 50kg. Liquid products are stored and transported in plastic barrels or glass fiber reinforced plastic tank trucks. The net weight of each barrel is 25kg, 40kg or 50kg. 6.3 The inner bag of the package is sealed with two ties or heat seals to ensure a tight seal. The outer bag is sewn with a bag sewing machine, with a stitch length of no more than 10mm, neat stitches, uniform stitch length, and no leaks or skipped stitches. The packaging barrel cover should use an acid- and alkali-resistant elastic gasket and be firmly sealed. 6.4 The packaging of industrial polyaluminium chloride products should be kept intact during transportation to prevent leakage and heat and moisture. 6.5 Industrial polyaluminium fluoride products should be stored in a cool, ventilated and dry warehouse. Additional Notes:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Liaoning Jinxi Nanpiao Chemical Plant, Sichuan Chengdu Shurong Water Purifier Plant, and Hebei Huanghua Chemical Industry Xinfa Co., Ltd. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang, Wang Fenglin, Luo Quan, and Wang Baozhong. This standard is not equivalent to the Japanese Industrial Standard JIS K1457-78 (84) "Polyaluminium chloride for water supply systems".01g), put it into a 250mL beaker, add 8mL hydrochloric acid solution and 100ml water, heat to a slight boil for 10min, filter it with medium-speed filter paper in a 400mL beaker while it is hot, wash it with water until the filtrate is about 200mL, heat the filtrate to boiling, add 10ml barium chloride solution dropwise while hot and stir, and keep it warm in a water bath (above 90C) for 2h. Filter with slow quantitative filter paper, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), put the filter paper and precipitate into a crucible that has been kept at constant weight at 800±25℃, dry and ash, put into a high-temperature furnace, and burn at 800±25℃ to constant weight. 4.5.4 Expression of analysis results
Sulfate content (in terms of S) expressed as a mass percentage X: Calculate according to the following formula: X.=
-mass of the sample in g;
rti: m,--
m-barium sulfate precipitate and crucible mass in g;
m--—mass of the sample in g;
(m2-m,)X0. 142
0.412——Coefficient for converting sulfuric acid precipitate into sulfate (SO4). 4.5.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.3%. 4.6 Determination of iron content
4.6.1 Summary of method
GB/T3049 Article 2.
4.6.2 Reagents and materials
Same as GB/T3049 Article 3.
4.6.3 Instruments and equipment
Same as GB/T3049 Article 4.
4.6.4 Analysis steps
4.6.4.1 Drawing of working curve
According to Article 5.3 of GB/T3049, select the absorption cell and the corresponding amount of iron standard solution according to the iron content of the sample, and draw the working curve. 4.6.4.2 Preparation of test solution
Weigh about 10g (liquid) or about 3g (solid) sample (accurate to 0.01g), place it in a 250mL beaker, add 10mL (1+1) hydrochloric acid and appropriate water, heat to dissolve, transfer all to a 500mL volumetric flask, dilute with water to the scale, shake well. Filter, use a pipette to transfer a certain volume of filtrate, place it in a 100mL volumetric flask, and add water to about 60mL. 4.6.4.3 Preparation of blank test solution
Except for not adding sample, other operations are the same as Article 4.6.4.2. 4.6.4.4 Determination
According to the provisions of Article 5.4 of GB/T3049, the operation shall be started from "add water to about 60 mL if necessary". 4.6.5 Expression of analysis results
Iron (Fe) content X expressed as mass percentage. Calculate according to formula (4): (m --mo)×10\
-The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: m\
-The amount of iron found from the working curve based on the measured absorbance of the reagent blank solution, mg, m
m—-Sample mass, g;
V—Volume of the test solution transferred, mL.
4.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.002%. 4
4.7 Determination of acid-insoluble matter content
4.7.1 Reagents and materials
4.7.1.1 Hydrochloric acid (GB/T622) solution: 1+1. HG/T 2677-95
4.7.1.2 Silver nitrate (GB/T670) solution: 17g/L. 4.7.2 Instruments and equipment
Crucible filter: filter plate pore size 5~15pm
4.7.3 Analysis steps
Weigh about 5g of sample (accurate to 0.01g), place in a 250mL beaker, add 200ml of water and 15mL of hydrochloric acid, heat and boil for 10min to dissolve the sample, and let it stand for 1h. 105-110℃ dried to constant weight crucible filter, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), dry crucible filter at 105-110℃ to constant weight. 4.7.4 Expression of analysis results
The acid insoluble content X expressed as mass percentage is calculated as follows: X, = mz = mx100
Where: m-mass of crucible filter, g;
m2-mass of crucible filter and insoluble matter, g; m-test material Mass, g.
4.7.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.05%. 5 Inspection rules
5.1 Industrial polyaluminium chloride shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial polyaluminium chloride shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, net weight grade, batch number or production date, product quality certificate of compliance with this standard and this standard number. 5.2 The user unit has the right to accept the industrial polyaluminium chloride received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 20t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. For solid products, when sampling, the sampler shall be inserted vertically from the center of the package to three-quarters of the depth of the material layer for sampling. After mixing the collected samples, reduce them to about 500g by quartering method, and pack them into two clean and dry wide-mouth bottles with ground stoppers, and seal them. For liquid products, use glass sampling tubes to collect samples from the upper, middle and lower parts of each barrel or tank car, and take out no less than 500mL of samples in total, place them in a clean and dry container, mix them evenly, and pack them into two polyethylene bottles, and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for 1 month for future reference.
5.5 If one of the indicators of the inspection results does not meet the requirements of this standard, sampling should be carried out from twice the amount of packaging. If the inspection results do not meet the requirements of this standard even if only one indicator does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 5.7 The rounded value comparison method specified in GB/T1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 Industrial polyaluminium chloride packaging should have firm and clear markings. The content includes: manufacturer name, product name, trademark, net weight, grade, batch number or production date and this standard number.
6.2 Industrial polyaluminium chloride solid products are double-layered. The inner bag is a vinyl film bag with a bag thickness of not less than 0.1mm. The outer bag is a plastic woven bag (select the corresponding model according to the provisions of GB8946). Each batch of packaging materials should be sampled and inspected, and its performance and inspection methods should comply with the provisions of 566
wHG/T2677-95
GB8946. The net weight of each bag is 25kg, 40kg or 50kg. Liquid products are stored and transported in plastic barrels or glass fiber reinforced plastic tank trucks. The net weight of each barrel is 25kg, 40kg or 50kg. 6.3 The inner bag of the package is sealed with two ties or heat seals to ensure a tight seal. The outer bag is sewn with a bag sewing machine, with a stitch length of no more than 10mm, neat stitches, uniform stitch length, and no leaks or skipped stitches. The packaging barrel cover should use an acid- and alkali-resistant elastic gasket and be firmly sealed. 6.4 The packaging of industrial polyaluminium chloride products should be kept intact during transportation to prevent leakage and heat and moisture. 6.5 Industrial polyaluminium fluoride products should be stored in a cool, ventilated and dry warehouse. Additional Notes:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Liaoning Jinxi Nanpiao Chemical Plant, Sichuan Chengdu Shurong Water Purifier Plant, and Hebei Huanghua Chemical Industry Xinfa Co., Ltd. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang, Wang Fenglin, Luo Quan, and Wang Baozhong. This standard is not equivalent to the Japanese Industrial Standard JIS K1457-78 (84) "Polyaluminium chloride for water supply systems".01g), put it into a 250mL beaker, add 8mL hydrochloric acid solution and 100ml water, heat to a slight boil for 10min, filter it with medium-speed filter paper in a 400mL beaker while it is hot, wash it with water until the filtrate is about 200mL, heat the filtrate to boiling, add 10ml barium chloride solution dropwise while hot and stir, and keep it warm in a water bath (above 90C) for 2h. Filter with slow quantitative filter paper, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), put the filter paper and precipitate into a crucible that has been kept at constant weight at 800±25℃, dry and ash, put into a high-temperature furnace, and burn at 800±25℃ to constant weight. 4.5.4 Expression of analysis results
Sulfate content (in terms of S) expressed as a mass percentage X: Calculate according to the following formula: X.=
-mass of the sample in g;
rti: m,--
m-barium sulfate precipitate and crucible mass, g;
m--—mass of the sample in g;
(m2-m,)X0. 142
0.412——Coefficient for converting sulfuric acid precipitate into sulfate (SO4). 4.5.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.3%. 4.6 Determination of iron content
4.6.1 Summary of method
GB/T3049 Article 2.
4.6.2 Reagents and materials
Same as GB/T3049 Article 3.
4.6.3 Instruments and equipment
Same as GB/T3049 Article 4.
4.6.4 Analysis steps
4.6.4.1 Drawing of working curve
According to Article 5.3 of GB/T3049, select the absorption cell and the corresponding amount of iron standard solution according to the iron content of the sample, and draw the working curve. 4.6.4.2 Preparation of test solution
Weigh about 10g (liquid) or about 3g (solid) sample (accurate to 0.01g), place it in a 250mL beaker, add 10mL (1+1) hydrochloric acid and appropriate water, heat to dissolve, transfer all to a 500mL volumetric flask, dilute with water to the scale, shake well. Filter, use a pipette to transfer a certain volume of filtrate, place it in a 100mL volumetric flask, and add water to about 60mL. 4.6.4.3 Preparation of blank test solution
Except for not adding sample, other operations are the same as Article 4.6.4.2. 4.6.4.4 Determination
According to the provisions of Article 5.4 of GB/T3049, the operation shall be started from "add water to about 60 mL if necessary". 4.6.5 Expression of analysis results
Iron (Fe) content X expressed as mass percentage. Calculate according to formula (4): (m --mo)×10\
-The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: m\
-The amount of iron found from the working curve based on the measured absorbance of the reagent blank solution, mg, m
m—-Sample mass, g;
V—Volume of the test solution transferred, mL.
4.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.002%. 4
4.7 Determination of acid-insoluble matter content
4.7.1 Reagents and materials
4.7.1.1 Hydrochloric acid (GB/T622) solution: 1+1. HG/T 2677-95
4.7.1.2 Silver nitrate (GB/T670) solution: 17g/L. 4.7.2 Instruments and equipment
Crucible filter: filter plate pore size 5~15pm
4.7.3 Analysis steps
Weigh about 5g of sample (accurate to 0.01g), place in a 250mL beaker, add 200ml of water and 15mL of hydrochloric acid, heat and boil for 10min to dissolve the sample, and let it stand for 1h. 105-110℃ dried to constant weight crucible filter, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), dry crucible filter at 105-110℃ to constant weight. 4.7.4 Expression of analysis results
The acid insoluble content X expressed as mass percentage is calculated as follows: X, = mz = mx100
Where: m-mass of crucible filter, g;
m2-mass of crucible filter and insoluble matter, g; m-test material Mass, g.
4.7.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.05%. 5 Inspection rules
5.1 Industrial polyaluminium chloride shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial polyaluminium chloride shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, net weight grade, batch number or production date, product quality certificate of compliance with this standard and this standard number. 5.2 The user unit has the right to accept the industrial polyaluminium chloride received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 20t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. For solid products, when sampling, the sampler shall be inserted vertically from the center of the package to three-quarters of the depth of the material layer for sampling. After mixing the collected samples, reduce them to about 500g by quartering method, and pack them into two clean and dry wide-mouth bottles with ground stoppers, and seal them. For liquid products, use glass sampling tubes to collect samples from the upper, middle and lower parts of each barrel or tank car, and take out no less than 500mL of samples in total, place them in a clean and dry container, mix them evenly, and pack them into two polyethylene bottles, and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for 1 month for future reference.
5.5 If one of the indicators of the inspection results does not meet the requirements of this standard, sampling should be carried out from twice the amount of packaging. If the inspection results do not meet the requirements of this standard even if only one indicator does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 5.7 The rounded value comparison method specified in GB/T1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial polyaluminium chloride should be firmly and clearly marked. The content includes: manufacturer name, product name, trademark, net weight, grade, batch number or production date and this standard number.
6.2 Industrial polyaluminium chloride solid products are double-layered. The inner bag is a vinyl film bag with a bag thickness of not less than 0.1mm. The outer bag is a plastic woven bag (select the corresponding model according to the provisions of GB8946). Each batch of packaging materials should be sampled and inspected, and its performance and inspection methods should comply with the provisions of 566
wHG/T2677-95
GB8946. The net weight of each bag is 25kg, 40kg or 50kg. Liquid products are stored and transported in plastic barrels or glass fiber reinforced plastic tank trucks. The net weight of each barrel is 25kg, 40kg or 50kg. 6.3 The inner bag of the package is sealed with two ties or heat seals to ensure a tight seal. The outer bag is sewn with a bag sewing machine, with a stitch length of no more than 10mm, neat stitches, uniform stitch length, and no leaks or skipped stitches. The packaging barrel cover should use an acid- and alkali-resistant elastic gasket and be firmly sealed. 6.4 The packaging of industrial polyaluminium chloride products should be kept intact during transportation to prevent leakage and heat and moisture. 6.5 Industrial polyaluminium fluoride products should be stored in a cool, ventilated and dry warehouse. Additional Notes:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Liaoning Jinxi Nanpiao Chemical Plant, Sichuan Chengdu Shurong Water Purifier Plant, and Hebei Huanghua Chemical Industry Xinfa Co., Ltd. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang, Wang Fenglin, Luo Quan, and Wang Baozhong. This standard is not equivalent to the Japanese Industrial Standard JIS K1457-78 (84) "Polyaluminium chloride for water supply systems".4 Expression of analysis results
Sulfate content (in terms of S) expressed as a percentage on a mass basis X: Calculate according to the following formula: X.=
-snail mass g;
rti: m2--
m-barium sulfate precipitate and crucible, g;
m---sample mass.g;
(m2-m2)X0.142
0.412——Coefficient for converting sulfuric acid precipitate into sulfate (SO4). 4.5.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.3%. 4.6 Determination of iron content
4.6.1 Summary of the method
冏Article 2 of GB/T3049.
4.6.2 Reagents and materials
Same as Article 3 of GB/T3049.
4.6.3 Instruments and equipment
Same as Article 4 of GB/T3049.
4.6.4 Analysis steps
4.6.4.1 Drawing of working curve
According to Article 5.3 of GB/T3049, select the absorption cell and the corresponding amount of iron standard solution according to the iron content of the sample, and draw the working curve. 4.6.4.2 Preparation of test solution
Weigh about 10g (liquid) or about 3g (solid) sample (accurate to 0.01g), put it in a 250mL beaker, add 10mL (1+1) hydrochloric acid and appropriate water, heat to dissolve, transfer all to a 500mL volumetric flask, dilute to the scale with water, and shake well. After filtering, use a pipette to transfer a certain volume of filtrate, place it in a 100mL volumetric flask, and add water to about 60mL. 4.6.4.3 Preparation of blank test solution
Except for not adding the sample, the other operations are the same as those in 4.6.4.2. 4.6.4.4 Determination
According to the provisions of Article 5.4 of GB/T3049, start the operation from "add water to about 60mL if necessary". 4.6.5 Expression of analytical results
The iron (Fe) content X expressed as mass percentage is calculated according to formula (4): (m --mo)×10\
-The amount of iron found from the working curve based on the measured absorbance of the test solution, mg; Where: m\
-The amount of iron found from the working curve based on the measured absorbance of the reagent blank solution, mg, m
m—-Sample mass, g;
V—Volume of the test solution transferred, mL.
4.6.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.002%. 4
4.7 Determination of acid-insoluble matter content
4.7.1 Reagents and materials
4.7.1.1 Hydrochloric acid (GB/T622) solution: 1+1. HG/T 2677-95
4.7.1.2 Silver nitrate (GB/T670) solution: 17g/L. 4.7.2 Instruments and equipment
Crucible filter: filter plate pore size 5~15pm
4.7.3 Analysis steps
Weigh about 5g of sample (accurate to 0.01g), place in a 250mL beaker, add 200ml of water and 15mL of hydrochloric acid, heat and boil for 10min to dissolve the sample, and let it stand for 1h. 105-110℃ dried to constant weight crucible filter, wash with hot water until the filtrate is free of chloride ions (check with silver nitrate solution), dry crucible filter at 105-110℃ to constant weight. 4.7.4 Expression of analysis results
The acid insoluble content X expressed as mass percentage is calculated as follows: X, = mz = mx100
Where: m-mass of crucible filter, g;
m2-mass of crucible filter and insoluble matter, g; m-test material Mass, g.
4.7.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.05%. 5 Inspection rules
5.1 Industrial polyaluminium chloride shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all industrial polyaluminium chloride shipped out of the factory meets the requirements of this standard. Each batch of products shipped out of the factory shall be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, net weight grade, batch number or production date, product quality certificate of compliance with this standard and this standard number. 5.2 The user unit has the right to accept the industrial polyaluminium chloride received in accordance with the provisions of this standard. 5.3 Each batch of products shall not exceed 20t.
5.4 Determine the number of sampling units in accordance with the provisions of Article 6.6 of GB/T6678. For solid products, when sampling, insert the sampler vertically from the center of the package to three-quarters of the depth of the material layer for sampling. After mixing the collected samples, reduce them to about 500g by quartering method, and pack them into two clean and dry wide-mouth bottles with ground stoppers, and seal them. For liquid products, use glass sampling tubes to collect samples from the upper, middle and lower parts of each barrel or tank car, and take out no less than 500mL of samples in total, place them in a clean and dry container, mix them evenly, and pack them into two polyethylene bottles, and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for 1 month for future reference.
5.5 If one of the indicators of the inspection results does not meet the requirements of this standard, sampling should be carried out from twice the amount of packaging. If the inspection results do not meet the requirements of this standard even if only one indicator does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.6 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 5.7 The rounded value comparison method specified in GB/T1250 shall be used to determine whether the inspection results meet the standards. 6 Marking, packaging, transportation, storage
6.1 The packaging of industrial polyaluminium chloride should be firmly and clearly marked. The content includes: manufacturer name, product name, trademark, net weight, grade, batch number or production date and this standard number.
6.2 Industrial polyaluminium chloride solid products are double-layered. The inner bag is a vinyl film bag with a bag thickness of not less than 0.1mm. The outer bag is a plastic woven bag (select the corresponding model according to the provisions of GB8946). Each batch of packaging materials should be sampled and inspected, and its performance and inspection methods should comply with the provisions of 566
wHG/T2677-95
GB8946. The net weight of each bag is 25kg, 40kg or 50kg. Liquid products are stored and transported in plastic barrels or glass fiber reinforced plastic tank trucks. The net weight of each barrel is 25kg, 40kg or 50kg. 6.3 The inner bag of the package is sealed with two ties or heat seals to ensure a tight seal. The outer bag is sewn with a bag sewing machine, with a stitch length of no more than 10mm, neat stitches, uniform stitch length, and no leaks or skipped stitches. The packaging barrel cover should use an acid- and alkali-resistant elastic gasket and be firmly sealed. 6.4 The packaging of industrial polyaluminium chloride products should be kept intact during transportation to prevent leakage and heat and moisture. 6.5 Industrial polyaluminium fluoride products should be stored in a cool, ventilated and dry warehouse. Additional Notes:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Tianjin Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Liaoning Jinxi Nanpiao Chemical Plant, Sichuan Chengdu Shurong Water Purifier Plant, and Hebei Huanghua Chemical Industry Xinfa Co., Ltd. The main drafters of this standard are Huang Jiaxu, Fan Guoqiang, Wang Fenglin, Luo Quan, and Wang Baozhong. This standard is not equivalent to the Japanese Industrial Standard JIS K1457-78 (84) "Polyaluminium chloride for water supply systems".4 Expression of analysis results
Sulfate content (in terms of S) expressed as a percentage on a mass basis X: Calculate according to the following formula: X.=
-snail mass g;
rti: m2--
m-barium sulfate precipitate and crucible, g;
m---sample mass.g;
(m2-m2)X0.142
0.412——Coefficient for converting sulfuric acid precipitate into sulfate (SO4). 4.5.5 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result, and the absolute difference of the parallel determination results shall not exceed 0.3%. 4.6 Determination of iron content
4.6.1 Summary of the method
冏Article 2 of GB/T3049.
4.6.2 Reagents and materials
Same as Article 3 of GB/T3049.
4.6.3 Instruments and equipment
Same as Article 4 of GB/T3049.
4.6.4 Analysis steps
4.6.4.1 Drawing of working curve||tt
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