Some standard content:
GB/T 4209-1996
In this standard, liquid products of superior quality are equivalent to Japanese standard JIS K1408-1966 (confirmed in 1985) "Industrial Sodium Silicate", and liquid products of non-equivalent quality are equivalent to JIS K1408-1966. This standard is a revision of GB/T4209-84 "Sodium Silicate". The main technical differences between this standard and Japanese standard JIS K1408-1966 (confirmed in 1985) "Industrial Sodium Silicate". (1) Japanese standard JIS K1408-1966 (confirmed in 1985) "Industrial Sodium Silicate" only includes liquid sodium silicate, and this standard adds solid sodium silicate.
(2) According to the actual situation in my country, the index items of this standard have added an item "modulus" compared with the Japanese standard. The main technical content changes between this standard and GB/T 4209-84 "Sodium Silicate". (1) GB/T4209-84 is only applicable to industrial liquid sodium silicate made from sodium carbonate. This standard adds industrial sodium silicate made from sodium sulfate or sodium hydroxide. (2) This standard adds solid sodium silicate. It is divided into two categories: liquid sodium silicate and solid sodium silicate. Solid sodium silicate is added. Solid sodium silicate is mainly used to make liquid sodium silicate. According to different uses, solid sodium silicate is divided into four types. Each type is divided into two levels. The index items and parameters are determined according to the enterprise standards and the corresponding liquid sodium silicate. (3) Since this standard expands the scope of application, each type of liquid sodium silicate is divided into three levels, one more level than GB/T4209-84.
(4) GB/T4209-84 expresses specific gravity in 20℃ and Baume degrees. This standard changes to 20℃ and density. The determination method is changed to density meter.
(5) The dissolution method of solid sodium silicate adopts pressure dissolution bomb dissolution. This standard shall replace GB/T4209--84 from the date of entry into force. This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The drafting units of this standard are: Tianjin Chemical Research Institute, Qingdao Soda Factory, Shijiazhuang Chemical Factory No. 5. The main drafters of this standard are: Jiang Junhua, Tian Yuqi, Fan Guoqiang, Zhang Yuehua, Xing Jiansuo. 243
1 Scope
National Standard of the People's Republic of China
Industrial Sodium Silicate
Sodium silicate for industrial useGB/T 4209—1996
GB/r 4209 - 84
This standard specifies the classification, model, requirements, sampling, test methods, marking, packaging, transportation and storage of industrial sodium silicate. This standard applies to industrial solid sodium silicate and industrial liquid sodium silicate made from sodium carbonate, sodium sulfate or sodium hydroxide and quartz sand as raw materials. Liquid sodium silicate is mainly used as chemical raw materials, fillers, adhesives, additives, preservatives, etc. Solid sodium silicate is mainly used to make liquid sodium silicate.
Molecular formula
2 Reference standards
Na2O· nSi02
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191---90 Pictorial marking for packaging, storage and transportation
Preparation of standard solution for titration analysis (volume analysis) of chemical reagents GB/T 601--88
GB/T 602-88
GB/T 603-88
Preparation of standard solution for determination of impurities of chemical reagents (negISO6353-1:1982) Preparation of preparations and products used in test methods for chemical reagents (negIS(）6353-1:1982) GB/T 1250-89
Expression and determination method of limit values GB/T 3049-86
General method for determination of iron content in chemical products-o-phenanthroline spectrophotometry (neqISO6685:1982) GB/T 6678--86
GB/T 6682--92
General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987) GB/T 8946-88
Plastic woven bags
3Product classification and model
Industrial sodium silicate is divided into two categories:
Class I: liquid sodium silicate. Class I: solid sodium silicate. Liquid sodium silicate is divided into five models: liquid-1, liquid-2, liquid-3, liquid-4, liquid-5. Solid sodium silicate is divided into four models: solid-1, solid-2, solid-3, solid-4. Liquid-1, liquid-2, liquid-4, solid-1, solid-2, solid-4 products are mainly used as binders, fillers and chemical raw materials. Liquid-3 and solid-3 products are mainly used in the building materials industry, etc., and liquid-5 and solid-4 products are used in the foundry industry, etc. 4 Requirements
4.1 Appearance: Liquid sodium silicate is a colorless, slightly colored, transparent or translucent viscous liquid. Solid sodium silicate is a colorless, slightly colored, transparent or translucent glass block.
Approved by the State Administration of Technical Supervision on December 2, 1996 24.1
Implementation on May 1, 1997
GB/T4209—1996
Industrial sodium silicate shall meet the requirements of Table 1 and Table 2. 4.2
Table 1 Technical indicators of industrial liquid sodium silicate
Model level
Indicator items
Iron (Fe) content, %
Water-insoluble matter content, %
Density (20℃), g/cm
Sodium oxide (Na20) content, %
Silicon dioxide (SiO2) content, %
Moduli (M)
Model level
Indicator items
Total soluble solid content%≥
Iron (Fe) content, %
Moduli (M)
5 Sampling
Excellent 1st grade
【Qualified Excellent|1st grade|Qualified|Excellent 1st grade Qualified|Excellent|1st grade Qualified|Excellent! 1st grade qualified
0. 020. 05
10.200.400.50|0.200.400.500.200.600.8010.20|0.40|0.500.20|0.80/1.00:—
1.318~1.342
3.5～3.7
1.368~1. 394
1. 436~1. 465
2. 6 2. 9
Table 2 Technical indicators of industrial solid sodium silicate
1st grade
Qualified products
5.1 Each batch of products shall not exceed 200t.
1st grade
Qualified product
1st grade
1. 368~~1. 394
Qualified product
1.526~~1.599
1st grade
Qualified product
5.2 Determine the number of sampling units according to the provisions of 6.6 of GB/T667886. Sampling method of liquid sodium silicate: Take samples from the container of uniformly mixed finished liquid sodium silicate, take an average sample of not less than 500g, and immediately put it into two clean, dry, plastic bottles with lids and seal them. Sampling method of solid sodium silicate: Randomly sample according to the determined number of sampling units. The sample taken from each bag is not less than 50g. Mix the samples thoroughly, reduce them to about 500g by quartering method, and immediately put them into two clean, dry wide-mouth bottles and seal them. A label is attached to the bottle, indicating: manufacturer name, product name, model, grade, batch number, sampling date and name of the sampler. One bottle is used as a laboratory sample, and the other bottle of liquid sodium silicate is stored for one month and solid sodium silicate is stored for three months for future reference. 5.3 If one of the test results does not meet the requirements of this standard, re-sample from twice the amount of packaging should be verified. Even if only one of the test results does not meet the requirements of this standard, the entire batch of products is unqualified. 6 Test method
The reagents and water used in this standard, unless otherwise specified, refer to analytical pure reagents and grade 3 water specified in GB/T6682-92. The standard solutions, impurity standard solutions, preparations and products required in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601-88, GB/T602-88 and GB/T603-88. The rounded value comparison method specified in 5.2 of GB/T1250-89 is used to determine whether the test results meet the standards. 6.1 Determination of iron content
6.1.1 Summary of method
According to Chapter 2 of GB/T3049-86.
6.1.2 Reagents and materials
According to Chapter 3 of GB/T3049-86.
6.1.2.1 Methyl orange: 1g/L solution.
6.1.2.2 Hydrochloric acid: 1+3 solution.
6.1.2.3 Bromine water: saturated solution at room temperature.
6.1.3 Instruments and equipment
According to Chapter 4 of GB/T3049-86.
6.1.3.1 Electric drying oven: controllable at 200. 6.1.3.2 Agate mortar.
6.1.3.350ml. Pressure bomb.
6.1.4 Analysis steps
6.1.4.1 Drawing of working curve
GB/T 42091996
According to the provisions of 5.3 of GB/T3049-86, use a 3cm absorption cell and the corresponding amount of iron standard solution to draw the working curve. 6.1.4.2 Preparation of test solution
a) Preparation of liquid sodium silicate test solution
Weigh 5g of the sample, weigh to 0.01g, place it in a 500mL beaker, add 150mL of water, add 2 drops of methyl orange indicator solution, add 1+3 hydrochloric acid solution to neutralize, then add 10mL in excess, then add 5mL of bromine water, boil for 5min, cool to room temperature, transfer all into a 250mL volumetric flask, dilute to the scale with water, shake the hook, this solution is test solution A. b) Preparation of solid sodium silicate test solution
Dry the sample to be tested, grind it with an agate mortar until there is no granular feeling, and place it in a drying oven at 105-110℃ to constant weight. Weigh about 1g of this sample, weigh it to 0.0002g, place it in a pressure bomb, add about 2mL of water, cover the bomb tightly, place it in an oven, and when the temperature rises to 180℃, continue to keep the temperature at 180℃ for 2h. Take out the bomb, when the temperature drops to 40℃, dissolve the sample with water above 80℃, transfer all of it into a 400mL beaker, add 2 drops of methyl orange indicator solution, neutralize it with 1+3 hydrochloric acid solution and add 10mL in excess, then add 5mL of bromine water, boil for 5min, cool to room temperature, transfer all of it into a 250mL volumetric flask, dilute to the scale with water, shake well, this solution is test solution B. 6.1.4.3 Preparation of blank test solution
In a 500mL beaker, add 150mL of water, 2 drops of methyl orange indicator solution, 15mL of 1+3 hydrochloric acid solution, 5mL of bromine water, boil for 5min, cool to room temperature, transfer all into a 250mL volumetric flask, dilute to scale with water, and shake well. 6.1.4.4 Measurement
Use a pipette to transfer the test solution (6.1.4.2): take 10mL of liquid sodium silicate premium, 5mL of test solution A of first-class, and 10mL of test solution B of solid sodium silicate, and place them in 100mL volumetric flasks respectively. In addition, use a pipette to take 10mL and 5mL of blank test solution (6.1.4.3) respectively, and place them in 100mL volumetric flasks respectively. The following operations are carried out according to 5.3.2 of GB/T3049-86, starting from "add water to about 60mL..."
6.1.5 Expression of analysis results
The iron (Fe) content (X,) expressed as mass percentage shall be calculated according to the formula ((1): X
mi - m2
25 X (mi - m2)
×100=
m×250
X 1000
Wherein: m,-——the amount of iron found from the working curve based on the measured absorbance of the test solution, mg; m2————the amount of iron found from the working curve based on the measured absorbance of the blank test solution, mg; V————the volume of the test solution (6.1.4.2) transferred, mL; m——the mass of the sample weighed when preparing the test solution (6.1.4.2), g. 246
6.1.6 Tolerance
GB/T 4209—1996
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 0.005% for liquid sodium silicate and 0.01% for solid sodium silicate.
6.2 Determination of water-insoluble matter content
6.2.1 Reagents and materials
6.2.1.1 Hydrochloric acid: 1+3 solution.
6.2.1.2 Sodium hydroxide: 50g/L solution. 6. 2.1.3 Phenolic acid: 10g/L ethanol solution. 6.2.1.4 Acid-washed asbestos: Take an appropriate amount of acid-washed asbestos, soak it in 1+3 hydrochloric acid solution, boil it for 20 minutes, filter it with a Buchner funnel and wash it with water until it is neutral. Then soak it in 50g/L sodium hydroxide solution and boil it for 20 minutes, filter it with a Buchner funnel and wash it with water until it is neutral (check with phenolic acid indicator solution). Mix it with water to make a thin paste and set aside. 6.2.2 Instruments and equipment
6.2.2.1 Gooch crucible: capacity 30mL.
Place the Gooch crucible on the filtration bottle, evenly spread about 3mm thick treated acid-washed asbestos on the upper and lower sides of the sieve plate, and wash with 60-80℃ water until the filtrate does not contain asbestos wool. Remove the crucible and dry it at 105-110℃, weigh it after cooling. Wash it with hot water, dry it at 105-110℃, weigh it after cooling. Repeat this process until the crucible has a constant weight. 6.2.3 Analysis steps
Weigh about 5g of sample, accurately to 0.01g, put it in a 400mL beaker, dissolve it with about 300mL of 60-80℃ water, filter it with a Gooch crucible that has been dried to constant weight at 105-110℃, and wash the residue with 60-80℃ water until there is no alkaline reaction (check with phenolic acid indicator solution). Dry the residue at 105-110℃ to constant weight. 6.2.4 Expression of analysis results
The water-insoluble content (X,) expressed as mass percentage is calculated according to formula (2): X. = m=m ×100
Where: ml—the mass of the Gooch crucible, g;
m2—the mass of the water-insoluble matter and the Gooch crucible, g; the mass of the sample, nominal.
6.2.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02%. 6.3 Determination of density
6.3.1 Summary of method
Read the density of the liquid from the depth of the hydrometer immersed in the measured liquid when it reaches equilibrium. 6.3.2 Instruments and equipment
6.3.2.1 Density meter: graduation value is 0.001g/cm2; 6.3.2.2 Constant temperature water bath: temperature controlled at 20±0.5℃; 6.3.2.3 250mL straight measuring cylinder;
6.3.2.4 Thermometer: graduation value is 1℃. 6.3.3 Analysis steps
Pour the sample to be tested into a clean and dry measuring cylinder without bubbles, and place the measuring cylinder in a constant temperature water bath at 20±0.5℃. After the temperature is constant, slowly place the clean and dry densimeter into the sample. The lower end should be more than 2 cm away from the bottom of the cylinder and cannot touch the cylinder wall. The upper end of the densimeter exposed outside the liquid surface should not be more than 2 to 3 scales of liquid. After the densimeter is stable in the sample, read the scale at the lower edge of the meniscus of the densimeter, which is the density of the sample at 20℃. 6.3.4 Allowable difference
GB/T 4209-1996
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.001g/cm. 6.4 Determination of sodium oxide content
6.4.1 Summary of the method
Use methyl red as the indicator and titrate the total alkalinity with hydrochloric acid standard titration solution. 6.4.2 Reagents and materials
6.4.2.1 Hydrochloric acid: c(HCI) about 0.2mol/I. standard titration solution. a) Preparation: Measure 18 mL of hydrochloric acid, inject it into 1000 mL of water, and shake well. b) Calibration: Weigh about 0.4 g of standard anhydrous sodium carbonate burned to constant weight at 270~~300℃, and weigh to 0.0001 g. Dissolve in 50 mL of water, add 10 drops of bromocresol green-methyl red mixed indicator solution, and titrate with the prepared hydrochloric acid standard titration solution until the solution changes from green to dark red. Boil for 2 minutes, cool and continue to titrate until the solution turns dark red again. Perform a blank test at the same time. c) Calculation: The actual concentration c of the hydrochloric acid standard titration solution in mol/L is calculated according to formula (3). m
c = (V/- V,) × 0. 052 99
Wherein; m is the mass of anhydrous sodium carbonate, g; V is the volume of standard hydrochloric acid solution consumed in titration, mL; V2 is the volume of standard hydrochloric acid solution consumed in blank test, mL; (3)
0.05299—--The mass of anhydrous sodium carbonate in grams equivalent to 1.00mL standard hydrochloric acid solution Cc(HC1)1.000mol/L3.
6.4.2.2 Methyl red: 1g/L ethanol solution. 6.4.3 Instruments and equipment
6.4.3.1 Electric drying oven: can be controlled at 200℃. 6.4.3.2 Agate mortar.
6.4.3.350mL pressure bomb.
6.4.4 Analysis steps
6.4.4.1 Preparation of test solution
a) Preparation of liquid sodium silicate test solution: weigh about 5g of sample, accurate to 0.0002g, transfer to a 250mL volumetric flask, dissolve with water, dilute to scale, shake well, this solution is test solution C. b) Preparation of solid sodium silicate test solution: dry the sample to be tested, grind it with an agate mortar until there is no granularity, and place it in a drying oven at 105~～110℃ to dry until constant weight. Weigh about 1g of the sample, accurate to 0.0002g, place it in a pressure bomb, add about 2mL of water, cover the bomb tightly, place it in an oven, and when the temperature rises to 180℃, continue to keep the temperature at 180℃ for 2h. Take out the bomb, when the temperature drops to 40℃, dissolve the sample with water above 80℃, cool to room temperature, transfer all into a 250mL volumetric flask, dilute to the scale, shake well, this solution is test solution D. 6.4.4.2 Determination
Use a pipette to transfer 50mL of test solution C or D (6.4.3.1) into a 300mL conical flask, add 10 drops of methyl red indicator solution, and titrate with hydrochloric acid standard titration solution until the solution changes from yellow to slightly red, which is the end point. The solution after titration is test solution E, and this solution is retained for the determination of silica content.
6.4.5 Expression of analysis results
The sodium oxide (Na2O) content (X:) expressed as mass percentage is calculated according to formula (4): X; = cV× 0. 030 99 × 100 = .VX15. 50m×0
-actual concentration of standard hydrochloric acid titration solution, mol/l; where: —
V—volume of standard hydrochloric acid titration solution consumed in the titration, mL; mass of the sample, g;
(4)
0.03099—mass of sodium oxide in grams equivalent to 1.00mL of standard hydrochloric acid titration solution Cc(HC1)=1.000mol/LJ. 248
6.4.6 Allowable difference
GB/T 4209-1996
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 0.1%. 6.5 Determination of silicon dioxide content
6.5.1 Summary of method
Add excess sodium fluoride to the solution after the sodium oxide content has been determined to generate a quantitative amount of sodium hydroxide. Add excess hydrochloric acid solution and then back-titrate with sodium hydroxide standard titration solution. 6.5.2 Reagents and materials
6.5.2.1 Hydrochloric acid: c(HCI) standard titration solution of about 0.5 mol/L. 6.5.2.2 Sodium hydroxide: c(NaOH) standard titration solution of about 0.5 mol/L. 6.5.2.3 Sodium fluoride.
6.5.2.4 Methyl red: 1g/1. ethanol solution. 6.5.3 Analysis steps
After determining the sodium oxide content, add 3±0.1g sodium fluoride to the test solution E (6.4.4.2), shake it to dissolve, and the solution will turn yellow again. Immediately titrate with hydrochloric acid standard titration solution until the red color remains unchanged, then add 2~3mL in excess, and accurately record the total volume of hydrochloric acid standard titration solution. Then titrate with sodium hydroxide standard titration solution until the yellow color is the end point. At the same time, do a blank test. In a 250mL conical flask, add about 50mL of water, 10 drops of methyl red indicator solution, add 3±0.1g sodium fluoride, and immediately titrate with hydrochloric acid standard titration solution until the red color remains unchanged, then add 2~3mL in excess, and accurately record the total volume of hydrochloric acid standard titration solution. Then titrate with sodium hydroxide standard titration solution until the yellow color is the end point. 6.5.4 Expression of analysis results
The silicon dioxide (SiO2) content (X) expressed as mass percentage shall be calculated according to formula (5): [(cV)(07)] × 0.015 02 × 100m X 50/250
[(cV - cV2) - (c-V3 - c,V)] × 7.510m
-actual concentration of standard hydrochloric acid titration solution, mol/L; where: c,—
actual concentration of standard sodium hydroxide titration solution, mol/L, volume of standard hydrochloric acid titration solution consumed in titration, mL, volume of standard sodium hydroxide titration solution consumed in titration, mL; V
V3—volume of standard hydrochloric acid titration solution consumed in blank test, mL; volume of standard sodium hydroxide titration solution consumed in blank test, mL; V
0.015 02
6.4.4.1 The mass of the sample for determining the sodium oxide content, g; · (5)
The mass of silicon dioxide in grams equivalent to 1.00mL of standard hydrochloric acid titration solution [c(HCI)==1.000mol/L].
6.5.5 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 0.2%. 6.6 Calculation of modulus (M)
The modulus (M) is the ratio of the molar number of silicon dioxide to the molar number of sodium oxide in the product, calculated according to formula (6): M-
Where: X is the percentage of sodium oxide (Na2O) (6.4.5); X,——the percentage of silicon dioxide (SiO) (6.5.4); 1.032—the ratio of the relative molecular mass of sodium oxide to silicon dioxide. 6.7 Calculation of total soluble solid content
(6)
6.7.1 Summary of the method
GB/T 4209-1996
After the sample is dissolved, measure its sodium oxide content and silicon dioxide content. The sum of the percentage of sodium oxide and the percentage of silicon dioxide is the total soluble solid content.
6.7.2 Calculation of total soluble solid content
The total soluble solid content (X,) expressed as mass percentage is calculated according to formula (7): Xs = X3+ X4
Where: X: — percentage of sodium oxide (6.4.5); X. — percentage of silicon dioxide (6.5.4). 7 Marking, packaging, transportation, storage
7.1 The packaging of industrial sodium silicate should be firmly and clearly marked with: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, and this standard number. 7.2 Each batch of products leaving the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 7.3 Industrial liquid sodium silicate is sealed and packaged in clean iron barrels, plastic barrels or tank trucks. Industrial solid sodium silicate is packaged in plastic woven bags. The net weight of each bag of product is 50kg, and the net weight of the product packaged in barrels and tank trucks is determined by the customer. 7.4 The plastic woven bags for packaging are selected according to the provisions of GB/T8946-88. They are sealed by sewing, or by vinyl rope or other ropes of equivalent quality. Iron barrels, plastic barrels, and tank trucks are sealed by pressing, hoop or spiral. 7.5 Industrial sodium silicate should be stored in a ventilated, dry and corrosion-free warehouse.VX15. 50m×0
-actual concentration of hydrochloric acid standard titration solution, mol/l; where:-
V-volume of hydrochloric acid standard titration solution consumed in titration, mL; mass of sample, g;
(4)
0.03099-mass of sodium oxide in grams equivalent to 1.00mL hydrochloric acid standard titration solution Cc(HC1)=1.000mol/LJ. 248
6.4.6 Allowable difference
GB/T 4209-1996
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 0.1%. 6.5 Determination of silicon dioxide content
6.5.1 Summary of method
Add excess sodium fluoride to the solution after the sodium oxide content has been determined to generate a certain amount of sodium hydroxide. Add excess hydrochloric acid solution and then back-titrate with sodium hydroxide standard titration solution. 6.5.2 Reagents and materials
6.5.2.1 Hydrochloric acid: c(HCI) standard titration solution of about 0.5 mol/L. 6.5.2.2 Sodium hydroxide: c(NaOH) standard titration solution of about 0.5 mol/L. 6.5.2.3 Sodium fluoride.
6.5.2.4 Methyl red: 1 g/1. ethanol solution. 6.5.3 Analysis steps
After determining the sodium oxide content, add 3±0.1g sodium fluoride to the test solution E (6.4.4.2), shake it to dissolve, and the solution will turn yellow again. Immediately titrate with hydrochloric acid standard titration solution until the red color remains unchanged, then add 2~3mL in excess, and accurately record the total volume of the hydrochloric acid standard titration solution. Then titrate with sodium hydroxide standard titration solution until the yellow color is the end point. At the same time, do a blank test. In a 250mL conical flask, add about 50mL of water and 10 drops of methyl red indicator solution, add 3±0.1g sodium fluoride, and immediately titrate with hydrochloric acid standard titration solution until the red color remains unchanged, then add 2~3mL in excess, and accurately record the total volume of the hydrochloric acid standard titration solution. Then titrate with sodium hydroxide standard titration solution until the yellow color is the end point. 6.5.4 Expression of analysis results
The silicon dioxide (SiO2) content (X) expressed as mass percentage shall be calculated according to formula (5): [(cV)(07)] × 0.015 02 × 100m X 50/250
[(cV - cV2) - (c-V3 - c,V)] × 7.510m
-actual concentration of standard hydrochloric acid titration solution, mol/L; where: c,—
actual concentration of standard sodium hydroxide titration solution, mol/L, volume of standard hydrochloric acid titration solution consumed in titration, mL, volume of standard sodium hydroxide titration solution consumed in titration, mL; V
V3—volume of standard hydrochloric acid titration solution consumed in blank test, mL; volume of standard sodium hydroxide titration solution consumed in blank test, mL; VwwW.bzxz.Net
0.015 02
6.4.4.1 The mass of the sample for determining the sodium oxide content, g; · (5)
The mass of silicon dioxide in grams equivalent to 1.00mL of standard hydrochloric acid titration solution [c(HCI)==1.000mol/L].
6.5.5 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 0.2%. 6.6 Calculation of modulus (M)
The modulus (M) is the ratio of the molar number of silicon dioxide to the molar number of sodium oxide in the product, calculated according to formula (6): M-
Where: X is the percentage of sodium oxide (Na2O) (6.4.5); X,——the percentage of silicon dioxide (SiO) (6.5.4); 1.032—the ratio of the relative molecular mass of sodium oxide to silicon dioxide. 6.7 Calculation of total soluble solid content
(6)
6.7.1 Summary of the method
GB/T 4209-1996
After the sample is dissolved, measure its sodium oxide content and silicon dioxide content. The sum of the percentage of sodium oxide and the percentage of silicon dioxide is the total soluble solid content.
6.7.2 Calculation of total soluble solid content
The total soluble solid content (X,) expressed as mass percentage is calculated according to formula (7): Xs = X3+ X4
Where: X: — percentage of sodium oxide (6.4.5); X. — percentage of silicon dioxide (6.5.4). 7 Marking, packaging, transportation, storage
7.1 The packaging of industrial sodium silicate should be firmly and clearly marked with: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, and this standard number. 7.2 Each batch of products leaving the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 7.3 Industrial liquid sodium silicate is sealed and packaged in clean iron barrels, plastic barrels or tank trucks. Industrial solid sodium silicate is packaged in plastic woven bags. The net weight of each bag of product is 50kg, and the net weight of the product packaged in barrels and tank trucks is determined by the customer. 7.4 The plastic woven bags for packaging are selected according to the provisions of GB/T8946-88. They are sealed by sewing, or by vinyl rope or other ropes of equivalent quality. Iron barrels, plastic barrels, and tank trucks are sealed by pressing edges, hoop or spiral. 7.5 Industrial sodium silicate should be stored in a ventilated, dry and corrosion-free warehouse.VX15. 50m×0
-actual concentration of hydrochloric acid standard titration solution, mol/l; where:-
V-volume of hydrochloric acid standard titration solution consumed in titration, mL; mass of sample, g;
(4)
0.03099-mass of sodium oxide in grams equivalent to 1.00mL hydrochloric acid standard titration solution Cc(HC1)=1.000mol/LJ. 248
6.4.6 Allowable difference
GB/T 4209-1996
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 0.1%. 6.5 Determination of silicon dioxide content
6.5.1 Summary of method
Add excess sodium fluoride to the solution after the sodium oxide content has been determined to generate a certain amount of sodium hydroxide. Add excess hydrochloric acid solution and then back-titrate with sodium hydroxide standard titration solution. 6.5.2 Reagents and materials
6.5.2.1 Hydrochloric acid: c(HCI) standard titration solution of about 0.5 mol/L. 6.5.2.2 Sodium hydroxide: c(NaOH) standard titration solution of about 0.5 mol/L. 6.5.2.3 Sodium fluoride.
6.5.2.4 Methyl red: 1 g/1. ethanol solution. 6.5.3 Analysis steps
After determining the sodium oxide content, add 3±0.1g sodium fluoride to the test solution E (6.4.4.2), shake it to dissolve, and the solution will turn yellow again. Immediately titrate with hydrochloric acid standard titration solution until the red color remains unchanged, then add 2~3mL in excess, and accurately record the total volume of the hydrochloric acid standard titration solution. Then titrate with sodium hydroxide standard titration solution until the yellow color is the end point. At the same time, do a blank test. In a 250mL conical flask, add about 50mL of water and 10 drops of methyl red indicator solution, add 3±0.1g sodium fluoride, and immediately titrate with hydrochloric acid standard titration solution until the red color remains unchanged, then add 2~3mL in excess, and accurately record the total volume of the hydrochloric acid standard titration solution. Then titrate with sodium hydroxide standard titration solution until the yellow color is the end point. 6.5.4 Expression of analysis results
The silicon dioxide (SiO2) content (X) expressed as mass percentage shall be calculated according to formula (5): [(cV)(07)] × 0.015 02 × 100m X 50/250
[(cV - cV2) - (c-V3 - c,V)] × 7.510m
-actual concentration of standard hydrochloric acid titration solution, mol/L; where: c,—
actual concentration of standard sodium hydroxide titration solution, mol/L, volume of standard hydrochloric acid titration solution consumed in titration, mL, volume of standard sodium hydroxide titration solution consumed in titration, mL; V
V3—volume of standard hydrochloric acid titration solution consumed in blank test, mL; volume of standard sodium hydroxide titration solution consumed in blank test, mL; V
0.015 02
6.4.4.1 The mass of the sample for determining the sodium oxide content, g; · (5)
The mass of silicon dioxide in grams equivalent to 1.00mL of standard hydrochloric acid titration solution [c(HCI)==1.000mol/L].
6.5.5 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 0.2%. 6.6 Calculation of modulus (M)
The modulus (M) is the ratio of the molar number of silicon dioxide to the molar number of sodium oxide in the product, calculated according to formula (6): M-
Where: X is the percentage of sodium oxide (Na2O) (6.4.5); X,——the percentage of silicon dioxide (SiO) (6.5.4); 1.032—the ratio of the relative molecular mass of sodium oxide to silicon dioxide. 6.7 Calculation of total soluble solid content
(6)
6.7.1 Summary of the method
GB/T 4209-1996
After the sample is dissolved, measure its sodium oxide content and silicon dioxide content. The sum of the percentage of sodium oxide and the percentage of silicon dioxide is the total soluble solid content.
6.7.2 Calculation of total soluble solid content
The total soluble solid content (X,) expressed as mass percentage is calculated according to formula (7): Xs = X3+ X4
Where: X: — percentage of sodium oxide (6.4.5); X. — percentage of silicon dioxide (6.5.4). 7 Marking, packaging, transportation, storage
7.1 The packaging of industrial sodium silicate should be firmly and clearly marked with: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, and this standard number. 7.2 Each batch of products leaving the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 7.3 Industrial liquid sodium silicate is sealed and packaged in clean iron barrels, plastic barrels or tank trucks. Industrial solid sodium silicate is packaged in plastic woven bags. The net weight of each bag of product is 50kg, and the net weight of the product packaged in barrels and tank trucks is determined by the customer. 7.4 The plastic woven bags for packaging are selected according to the provisions of GB/T8946-88. They are sealed by sewing, or by vinyl rope or other ropes of equivalent quality. Iron barrels, plastic barrels, and tank trucks are sealed by pressing, hoop or spiral. 7.5 Industrial sodium silicate should be stored in a ventilated, dry and corrosion-free warehouse.5.5 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 0.2%. 6.6 Calculation of modulus (M)
The modulus (M) is the ratio of the molar number of silicon dioxide to the molar number of sodium oxide in the product, calculated according to formula (6): M-
Wherein: X is the percentage content of sodium oxide (Na2O) (6.4.5); X,——the percentage content of silicon dioxide (SiO) (6.5.4); 1.032—the ratio of the relative molecular mass of sodium oxide to silicon dioxide. 6.7 Calculation of total soluble solid content
(6)
6.7.1 Summary of the method
GB/T 4209-1996
After the sample is dissolved, measure its sodium oxide content and silicon dioxide content. The sum of the percentage of sodium oxide and the percentage of silicon dioxide is the total soluble solid content.
6.7.2 Calculation of total soluble solid content
The total soluble solid content (X,) expressed as mass percentage is calculated according to formula (7): Xs = X3+ X4
Where: X: — percentage of sodium oxide (6.4.5); X. — percentage of silicon dioxide (6.5.4). 7 Marking, packaging, transportation, storage
7.1 The packaging of industrial sodium silicate should be firmly and clearly marked with: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, and this standard number. 7.2 Each batch of products leaving the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 7.3 Industrial liquid sodium silicate is sealed and packaged in clean iron barrels, plastic barrels or tank trucks. Industrial solid sodium silicate is packaged in plastic woven bags. The net weight of each bag of product is 50kg, and the net weight of the product packaged in barrels and tank trucks is determined by the customer. 7.4 The plastic woven bags for packaging are selected according to the provisions of GB/T8946-88. They are sealed by sewing, or by vinyl rope or other ropes of equivalent quality. Iron barrels, plastic barrels, and tank trucks are sealed by pressing, hoop or spiral. 7.5 Industrial sodium silicate should be stored in a ventilated, dry and corrosion-free warehouse.5.5 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 0.2%. 6.6 Calculation of modulus (M)
The modulus (M) is the ratio of the molar number of silicon dioxide to the molar number of sodium oxide in the product, calculated according to formula (6): M-
Wherein: X is the percentage content of sodium oxide (Na2O) (6.4.5); X,——the percentage content of silicon dioxide (SiO) (6.5.4); 1.032—the ratio of the relative molecular mass of sodium oxide to silicon dioxide. 6.7 Calculation of total soluble solid content
(6)
6.7.1 Summary of the method
GB/T 4209-1996
After the sample is dissolved, measure its sodium oxide content and silicon dioxide content. The sum of the percentage of sodium oxide and the percentage of silicon dioxide is the total soluble solid content.
6.7.2 Calculation of total soluble solid content
The total soluble solid content (X,) expressed as mass percentage is calculated according to formula (7): Xs = X3+ X4
Where: X: — percentage of sodium oxide (6.4.5); X. — percentage of silicon dioxide (6.5.4). 7 Marking, packaging, transportation, storage
7.1 The packaging of industrial sodium silicate should be firmly and clearly marked with: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, and this standard number. 7.2 Each batch of products leaving the factory should have a quality certificate. The content includes: manufacturer name, factory address, product name, model, grade, trademark, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 7.3 Industrial liquid sodium silicate is sealed and packaged in clean iron barrels, plastic barrels or tank trucks. Industrial solid sodium silicate is packaged in plastic woven bags. The net weight of each bag of product is 50kg, and the net weight of the product packaged in barrels and tank trucks is determined by the customer. 7.4 The plastic woven bags for packaging are selected according to the provisions of GB/T8946-88. They are sealed by sewing, or by vinyl rope or other ropes of equivalent quality. Iron barrels, plastic barrels, and tank trucks are sealed by pressing, hoop or spiral. 7.5 Industrial sodium silicate should be stored in a ventilated, dry and corrosion-free warehouse.
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