Some standard content:
HG/T2829-1997
This industry standard is formulated based on the standards of major domestic enterprises and according to actual production conditions and user requirements. This standard is divided into two levels.
Appendix A of this standard is the appendix of the standard.
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 Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The drafting units of this standard are: Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Shandong Zibo Dongyue Fluorine Chemical Co., Ltd., and Xiongxian Chemical General Plant of Sinochem Hebei Group.
The main drafters of this standard are: Wang Qi, Zhang Wucheng, Yu Xiuyuan, Wang Xingtian, and Yang Hewen. This standard is entrusted to the technical unit responsible for standardization of inorganic salt products of the Ministry of Chemical Industry for interpretation. 712
1 Scope
Chemical Industry Standard of the People's Republic of China
Industrial Anhydrous Potassium Fluoride
Potassium fluoride anhydrous for industrial useHG/T 2829-1997
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of industrial anhydrous potassium fluoride. This standard is applicable to industrial anhydrous potassium fluoride. The product is mainly used as glass engraving, welding flux, pesticide, fluorinating agent and absorbent. Molecular formula: KF
Relative molecular mass: 58.10 (according to the 1993 international relative atomic mass) 2 Reference standards
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 version of the following standards. （GI3191—1990 Pictorial symbols for packaging, storage and transportation GB/T601--1988 Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents GB/T603.-1988 Preparation of preparations and products used in chemical reagent test methods (neqISO6353-11982) GB/T1250--1989 Methods for expressing and determining limit values GB/T 6678--1986
GB/T 6682---1992
GB/T 8946---1988
3.1 Appearance: white powder.
General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987)Plastic woven bags
3.2 Industrial anhydrous potassium fluoride shall meet the requirements of Table 1. Table 1 Requirements
Potassium fluoride (KF) Content
Potassium chloride (KCI) Content of pendant
Free acid or
Free alkali
(calculated as HF)
(calculated as KOH)
Each batch of products shall not exceed 10t.
The Ministry of Chemical Industry of the People's Republic of China approved the first-class product on February 4, 1997
Qualified product
Implemented on October 1, 1997
HG/T 2829-1997
4.2 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678. When sampling, insert the sampler obliquely from the top of the packaging bag to 3/4 of the depth of the material layer to take samples. After mixing the collected samples, reduce them to no less than 500g by the quartering method, and divide them into two clean and dry wide-mouth bottles with stoppers and seal them. Label the bottles with the following information: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used as a laboratory sample, and the other bottle is kept for three months for future reference. 4.3 If any indicator of the test results does not meet the requirements of this standard, re-sampling should be carried out from twice the amount of packaging for verification. Even if any indicator of the verification results does not meet the requirements of this standard, the entire batch of products will be unqualified. 4.4 The user should conduct the test within 15 days from the date of receipt of the goods. 5 Test method
5.1 Determine the test results by the rounded value comparison method specified in 5.2 of GB/T1250. 5.2 The reagents and water used in this standard, unless otherwise specified, refer to analytically pure reagents and grade 3 water specified in GB/T6682. The standard titration solutions, preparations and products used in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601 and GB/T603.
5.3 Determination of potassium fluoride content
5.3.1 Method summary
Dissolve the sample in water and pass it through a strong acid cation The ion exchange column is exchanged to generate hydrofluoric acid, which is titrated with sodium hydroxide standard titration solution using phenol as the indicator solution.
5.3.2 Reagents and materials
5.3.2.1 H-732 type ion exchange resin; 5.3.2.2 Hydrochloric acid solution: 1+6;
5.3.2.3 Sodium hydroxide standard titration solution: c(NaOH) is about 0.5 mol/L; 5.3.2.4 Phenolic acid indicator solution: 10 g/L.
5.3.3 Instruments and equipment
Ion exchange column: polyethylene plastic tube, inner diameter 25 mm, length 500 mm, with a stopcock at the bottom. 5.3.4 Analysis steps
5.3.4.1 Preparation of ion exchange column
Fix the ion exchange column on the rack, close the piston, fill the bottom of the column with 1 cm thick asbestos wool, and pour about 10 mL of water to wet it. Pour the pretreated resin into the column so that the resin bed height is 400mm. Treat according to the provisions of Appendix A before use. 5.3.4.2 Determination
Weigh about 1g of sample (accurate to 0.0002g), place it in a 100mL plastic cup, add 50mL of water to dissolve, and inject it into the ion exchange column. Use water as the elution solution, control the column flow rate to 5.0mL/min~~6.0ml./min, wash until the effluent is neutral (check with pH test paper), and collect the effluent in a 500mL plastic cup. Add 2 drops of phenolic indicator solution to the effluent, and titrate with sodium hydroxide standard titration solution until the solution turns pink and remains pink for 30s. 5.3.5 Expression of analytical results
The potassium fluoride (KF) content X expressed as mass percentage is calculated according to formula (1): X = Ve × 0.058 10 × 100X2 × 0.779 9 X × 2.904m
-X2 × 0.779 9-X4 × 2.904
Wherein: V——the volume of sodium hydroxide standard titration solution consumed in the titration effluent, mL; V——the actual concentration of sodium hydroxide standard titration solution, mol/L; (1)
The mass of potassium fluoride (KF) in grams equivalent to 1.00 mL of sodium hydroxide standard titration solution (c(NaOH)=1.000 mol/L); www.bzxz.net
HG/T 2829—1997
X, one, the content of potassium chloride expressed as a mass percentage measured according to 5.4; the coefficient of potassium chloride conversion to potassium fluoride;
0. 779 9
-the content of free acid expressed as a mass percentage measured according to 5.6; X, -
2.904—The coefficient for converting hydrofluoric acid into potassium fluoride; m-
The mass of the sample·g.
5.3.6 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 0.2%. 5.4 Determination of potassium chloride content
5.4.1 Summary of method
Dissolve the sample in water, use fluorescein as the indicator solution, and titrate with silver nitrate standard titration solution. 5.4.2 Reagents and materials
5.4.2.1 Sodium hydroxide solution: 4g/1., 5.4.2.2 Sulfuric acid solution: 1+99;
5.4.2.3 Starch indicator solution: 10g/L;
5.4.2.4 Silver nitrate standard titration solution: c(AgNO,) approx. 0.1mol/L; 5.4.2.5 Fluorescein indicator solution: 5g/L.
5.4.3 Instruments and equipment
Microburette: graduation value is 0.02mL or 0.05mL. 5.4.4 Analysis steps
Weigh about 2g of sample (accurate to 0.01g) and place it in a 250mL plastic cup. Add 50mL of water to dissolve, and adjust the pH value of the test solution to 7-8 with sodium hydroxide solution or sulfuric acid solution (check with pH test paper). Add 10mL of starch indicator solution, use a microburette, and titrate with silver nitrate standard titration solution. Add 3 drops of fluorescein indicator solution when it is close to the end point, and continue to titrate until the solution turns light red. 5.4.5 Expression of analysis results
The potassium chloride (KC1) content X expressed as mass percentage is calculated according to formula (2): X =Ve×0.0745×100
= Ve×7.45
Where: V-.—Volume of silver nitrate standard titration solution consumed by titrating the test solution, mL; c—--actual concentration of silver nitrate standard titration solution, mol/L; m—-mass of the sample, g;
(2)
0.0745---mass of potassium chloride in grams equivalent to 1.00ml of silver nitrate standard titration solution Lc (AgNO:) = 1.000mol/L).
5.4.6 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%. 5.5 Determination of moisture
5.5.1 Instruments and equipment
Weighing bottle: @50mm×30mm.
5.5.2 Analysis steps
Weigh about 1g of sample (accurate to 0.0002g) and place it in a weighing bottle that has been dried to constant weight at 120℃. Dry at 120℃ to constant weight.
5.5.3 Expression of analysis results
Water content X expressed as mass percentage: Calculate according to formula (3): 715
Where: mi-
HG/T 2829—1997
Mass of sample and weighing bottle before drying, g: -Mass of sample and weighing bottle after drying, g; Mass of sample, g.
5.5.4 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.05%. 5.6 Determination of free acid or free base content
5.6.1 Reagents and materials
5.6.1.1 Carbon dioxide-free water.
5.6.1.2 Standard sodium hydroxide titration solution: c(NaOH) about 0.1 mol/L;5.6.1.3 Standard hydrochloric acid titration solution: c(HCI) about 0.1 mol/I5.6.1.4 Phenolic acid indicator solution: 10 g/I.
5.6.2 Instruments and equipment
Microburette: graduation value is 0.02 mL or 0.05 mL5.6.3 Analysis steps
(3)
Weigh about 5 g of sample (accurate to 0.01 g), place it in a 250 mL plastic cup, add 50 mL of carbon dioxide-free water to dissolve, and add 2 drops of phenolphthalein indicator solution.
If the test solution is colorless, titrate with sodium hydroxide standard titration solution until the solution turns pink and remains unchanged for 30 seconds. If the test solution is red, titrate with hydrochloric acid standard titration solution until the solution is just colorless. 5.6.4 Expression of analysis results
The free acid content (calculated as HF) expressed as mass percentage X is calculated according to formula (4): X4 = Ve × 0. 020 01 × 100
Vc × 2. 001
Where: V is the volume of sodium hydroxide standard titration solution consumed in titrating the test solution, mL; the actual concentration of sodium hydroxide standard titration solution, mol/L; C.
mass of the sample, g;
mass of hydrofluoric acid equivalent to 1.00 mL of sodium hydroxide standard titration solution [c(NaOH)-1.000 mol/L) expressed in grams.
The free alkali content (in KOH) expressed as a mass percentage X is calculated according to formula (5): X = Ve × 0. 05611 × 100
Ve × 5. 611
Wherein: V
The volume of the standard hydrochloric acid titration solution consumed by the titration test solution, mL; c—--the actual concentration of the standard hydrochloric acid titration solution, mol/L; m—-the mass of the sample, g;
0.05611—-the mass of potassium hydroxide expressed in grams equivalent to 1.00mL of the standard hydrochloric acid titration solution Cc(HC1)=1.000mol/L>.
5.6.5 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%. 716
6 Marking, packaging, transportation, storage
HG/T 2829-—1997
6.1 The packaging of industrial anhydrous potassium fluoride should be firmly and clearly marked, including: manufacturer name, address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "toxic" mark specified in GB190 and the "heat-averse and moisture-averse" mark specified in GB191.
6.2 Each batch of industrial anhydrous potassium fluoride shipped out of the factory should be accompanied by a quality certificate. The content includes: manufacturer name, address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality complies with this standard and this standard number. 6.3 Industrial anhydrous potassium fluoride is packaged in two ways. 6.3.1 Woven bag packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm; the outer packaging adopts plastic woven bags, and its performance and inspection methods shall comply with the provisions of Type A of GB/T8946. The net weight of each bag is 10kg or 25kg. 6.3.2 Cardboard barrel packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm, and the outer packaging adopts cardboard barrels. The net weight of each barrel is 20kg.
6.4 Two sealing methods are used for industrial anhydrous potassium fluoride. 6.4.1 When woven bags are used for packaging, the two layers of inner bags are tied four times with vinyl ropes or other ropes of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat, and the stitch length is uniform. There is no leakage or skipping. 6.4.2 When using cardboard barrels for packaging, the two inner bags shall be tied four times with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the cardboard barrels shall be covered and tightly bound. 6.5 Industrial anhydrous potassium fluoride shall be covered during transportation to prevent rain and moisture. 6.6 Industrial anhydrous potassium fluoride shall be stored in a cool and dry place to prevent rain and moisture. 717
A1 Pretreatment of resin
HG/T2829—1997
Appendix A
(Appendix to the standard)
Pretreatment and regeneration of resin
Put the resin in a plastic container and rinse it with clean water until the water is clear. Soak the resin in water for 12h24h to fully expand it. If it is dry resin, it should be soaked in saturated sodium chloride solution first, and then the sodium chloride solution should be gradually diluted to prevent the resin from suddenly expanding and breaking. Soak the resin in 1+6 hydrochloric acid solution twice the volume of the resin for 2h~4h, stirring occasionally. The resin can also be loaded into a column, and the acid solution is passed through the resin layer at a flow rate of 5.0mL/min~6.0mL/min by the dynamic method, and then the resin is washed from top to bottom (occasionally from bottom to top) with water until the pH of the effluent is 4, and then treated with 2%~5% sodium hydroxide solution, and then washed with water until it is slightly alkaline, and then treated with 1+6 hydrochloric acid solution again to make the resin hydrogen type. Finally, wash with water until it is neutral. Resin regeneration
After each sample elution and separation is completed, 400mL of 1+6 hydrochloric acid solution is passed through the resin bed to regenerate the resin. Before use, wash the resin slowly with water, and then wash at a flow rate of 5.0mL/min~6.0mL/min until the effluent is neutral (check with pH test paper). Keep the liquid level 1 cm above the resin layer, close the exchange column, and set aside. 7181 Carbon dioxide-free water.
5.6.1.2 Sodium hydroxide standard titration solution: c(NaOH) about 0.1mol/L; 5.6.1.3 Hydrochloric acid standard titration solution: c(HCI) about 0.1mol/I 5.6.1.4 Phenolic acid indicator solution: 10g/I.
5.6.2 Instruments and equipment
Microburette: graduation value is 0.02mL or 0.05mL 5.6.3 Analysis steps
(3)
Weigh about 5g of sample (accurate to 0.01g), place it in a 250mL plastic cup, add 50mL carbon dioxide-free water to dissolve, and add 2 drops of phenolphthalein indicator solution.
If the test solution is colorless, titrate with sodium hydroxide standard titration solution until the solution turns pink and keeps it for 30s without fading. If the test solution is red, titrate with hydrochloric acid standard titration solution until the solution is just colorless. 5.6.4 Expression of analysis results
The free acid content (calculated as HF) expressed as mass percentage X is calculated according to formula (4): X4 = Ve × 0.020 01 × 100
Vc × 2.001
Wherein: V is the volume of the standard sodium hydroxide solution consumed in the titration of the test solution, mL; the actual concentration of the standard sodium hydroxide solution, mol/L; C is the mass of the sample, g;
the mass of hydrofluoric acid equivalent to 1.00 mL of the standard sodium hydroxide solution [c(NaOH)-1.000 mol/L) expressed in grams.
The free alkali content (in KOH) expressed as a mass percentage X is calculated according to formula (5): X = Ve × 0. 05611 × 100
Ve × 5. 611
Wherein: V
The volume of the standard hydrochloric acid titration solution consumed by the titration test solution, mL; c—--the actual concentration of the standard hydrochloric acid titration solution, mol/L; m—-the mass of the sample, g;
0.05611—-the mass of potassium hydroxide expressed in grams equivalent to 1.00mL of the standard hydrochloric acid titration solution Cc(HC1)=1.000mol/L>.
5.6.5 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%. 716
6 Marking, packaging, transportation, storage
HG/T 2829-—1997
6.1 The packaging of industrial anhydrous potassium fluoride should be firmly and clearly marked, including: manufacturer name, address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "toxic" mark specified in GB190 and the "heat-averse and moisture-averse" mark specified in GB191.
6.2 Each batch of industrial anhydrous potassium fluoride shipped out of the factory should be accompanied by a quality certificate. The content includes: manufacturer name, address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality complies with this standard and this standard number. 6.3 Industrial anhydrous potassium fluoride is packaged in two ways. 6.3.1 Woven bag packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm; the outer packaging adopts plastic woven bags, and its performance and inspection methods shall comply with the provisions of Type A of GB/T8946. The net weight of each bag is 10kg or 25kg. 6.3.2 Cardboard barrel packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm, and the outer packaging adopts cardboard barrels. The net weight of each barrel is 20kg.
6.4 Two sealing methods are used for industrial anhydrous potassium fluoride. 6.4.1 When woven bags are used for packaging, the two layers of inner bags are tied four times with vinyl ropes or other ropes of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat, and the stitch length is uniform. There is no leakage or skipping. 6.4.2 When using cardboard barrels for packaging, the two inner bags shall be tied four times with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the cardboard barrels shall be covered and tightly bound. 6.5 Industrial anhydrous potassium fluoride shall be covered during transportation to prevent rain and moisture. 6.6 Industrial anhydrous potassium fluoride shall be stored in a cool and dry place to prevent rain and moisture. 717
A1 Pretreatment of resin
HG/T2829—1997
Appendix A
(Appendix to the standard)
Pretreatment and regeneration of resin
Put the resin in a plastic container and rinse it with clean water until the water is clear. Soak the resin in water for 12h24h to allow it to fully expand. If it is dry resin, it should be soaked in saturated sodium chloride solution first, and then the sodium chloride solution should be gradually diluted to prevent the resin from suddenly expanding and breaking. Soak the resin in 1+6 hydrochloric acid solution twice the volume of the resin for 2h~4h, stirring occasionally. The resin can also be loaded into a column, and the acid solution is passed through the resin layer at a flow rate of 5.0mL/min~6.0mL/min by the dynamic method, and then the resin is washed from top to bottom (occasionally from bottom to top) with water until the pH of the effluent is 4, and then treated with 2%~5% sodium hydroxide solution, and then washed with water until it is slightly alkaline, and then treated with 1+6 hydrochloric acid solution again to make the resin hydrogen type. Finally, wash with water until it is neutral. Resin regeneration
After each sample elution and separation is completed, 400mL of 1+6 hydrochloric acid solution is passed through the resin bed to regenerate the resin. Before use, wash the resin slowly with water, and then wash at a flow rate of 5.0mL/min~6.0mL/min until the effluent is neutral (check with pH test paper). Keep the liquid level 1 cm above the resin layer, close the exchange column, and set aside. 7181 Carbon dioxide-free water.
5.6.1.2 Sodium hydroxide standard titration solution: c(NaOH) about 0.1mol/L; 5.6.1.3 Hydrochloric acid standard titration solution: c(HCI) about 0.1mol/I 5.6.1.4 Phenolic acid indicator solution: 10g/I.
5.6.2 Instruments and equipment
Microburette: graduation value is 0.02mL or 0.05mL 5.6.3 Analysis steps
(3)
Weigh about 5g of sample (accurate to 0.01g), place it in a 250mL plastic cup, add 50mL of carbon dioxide-free water to dissolve, and add 2 drops of phenolphthalein indicator solution.
If the test solution is colorless, titrate with sodium hydroxide standard titration solution until the solution turns pink and keeps it for 30s without fading. If the test solution is red, titrate with hydrochloric acid standard titration solution until the solution is just colorless. 5.6.4 Expression of analysis results
The free acid content (calculated as HF) expressed as mass percentage X is calculated according to formula (4): X4 = Ve × 0.020 01 × 100
Vc × 2.001
Wherein: V is the volume of the standard sodium hydroxide solution consumed in the titration of the test solution, mL; the actual concentration of the standard sodium hydroxide solution, mol/L; C is the mass of the sample, g;
is the mass of hydrofluoric acid equivalent to 1.00 mL of the standard sodium hydroxide solution [c(NaOH)-1.000 mol/L) expressed in grams.
The free alkali content (in KOH) expressed as a mass percentage X is calculated according to formula (5): X = Ve × 0. 05611 × 100
Ve × 5. 611
Wherein: V
The volume of the standard hydrochloric acid titration solution consumed by the titration test solution, mL; c—--the actual concentration of the standard hydrochloric acid titration solution, mol/L; m—-the mass of the sample, g;
0.05611—-the mass of potassium hydroxide expressed in grams equivalent to 1.00mL of the standard hydrochloric acid titration solution Cc(HC1)=1.000mol/L>.
5.6.5 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%. 716
6 Marking, packaging, transportation, storage
HG/T 2829-—1997
6.1 The packaging of industrial anhydrous potassium fluoride should be firmly and clearly marked, including: manufacturer name, address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "toxic" mark specified in GB190 and the "heat-averse and moisture-averse" mark specified in GB191.
6.2 Each batch of industrial anhydrous potassium fluoride shipped out of the factory should be accompanied by a quality certificate. The content includes: manufacturer name, address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality complies with this standard and this standard number. 6.3 Industrial anhydrous potassium fluoride is packaged in two ways. 6.3.1 Woven bag packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm; the outer packaging adopts plastic woven bags, and its performance and inspection methods shall comply with the provisions of Type A of GB/T8946. The net weight of each bag is 10kg or 25kg. 6.3.2 Cardboard barrel packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm, and the outer packaging adopts cardboard barrels. The net weight of each barrel is 20kg.
6.4 Two sealing methods are used for industrial anhydrous potassium fluoride. 6.4.1 When woven bags are used for packaging, the two layers of inner bags are tied four times with vinyl ropes or other ropes of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat, and the stitch length is uniform. There is no leakage or skipping. 6.4.2 When using cardboard barrels for packaging, the two inner bags shall be tied four times with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the cardboard barrels shall be covered and tightly bound. 6.5 Industrial anhydrous potassium fluoride shall be covered during transportation to prevent rain and moisture. 6.6 Industrial anhydrous potassium fluoride shall be stored in a cool and dry place to prevent rain and moisture. 717
A1 Pretreatment of resin
HG/T2829—1997
Appendix A
(Appendix to the standard)
Pretreatment and regeneration of resin
Put the resin in a plastic container and rinse it with clean water until the water is clear. Soak the resin in water for 12h24h to allow it to fully expand. If it is dry resin, it should be soaked in saturated sodium chloride solution first, and then the sodium chloride solution should be gradually diluted to prevent the resin from suddenly expanding and breaking. Soak the resin in 1+6 hydrochloric acid solution twice the volume of the resin for 2h~4h, stirring occasionally. The resin can also be loaded into a column, and the acid solution is passed through the resin layer at a flow rate of 5.0mL/min~6.0mL/min by the dynamic method, and then the resin is washed from top to bottom (occasionally from bottom to top) with water until the pH of the effluent is 4, and then treated with 2%~5% sodium hydroxide solution, and then washed with water until it is slightly alkaline, and then treated with 1+6 hydrochloric acid solution again to make the resin hydrogen type. Finally, wash with water until it is neutral. Resin regeneration
After each sample elution and separation is completed, 400mL of 1+6 hydrochloric acid solution is passed through the resin bed to regenerate the resin. Before use, wash the resin slowly with water, and then wash at a flow rate of 5.0mL/min~6.0mL/min until the effluent is neutral (check with pH test paper). Keep the liquid level 1 cm above the resin layer, close the exchange column, and set aside. 7181 Woven bag packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm; the outer packaging adopts plastic woven bags, and its performance and inspection methods shall comply with the provisions of Type A of GB/T8946. The net weight of each bag is 10kg or 25kg. 6.3.2 Cardboard barrel packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm, and the outer packaging adopts cardboard barrels. The net weight of each barrel is 20kg.
6.4 Two sealing methods are used for industrial anhydrous potassium fluoride. 6.4.1 When woven bags are used for packaging, the two layers of inner bags are tied four times with vinyl ropes or other ropes of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the outer bag is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat, and the stitch length is uniform. There is no leakage or skipping. 6.4.2 When using cardboard barrels for packaging, the two inner bags shall be tied four times with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the cardboard barrels shall be covered and tightly bound. 6.5 Industrial anhydrous potassium fluoride shall be covered during transportation to prevent rain and moisture. 6.6 Industrial anhydrous potassium fluoride shall be stored in a cool and dry place to prevent rain and moisture. 717
A1 Pretreatment of resin
HG/T2829—1997
Appendix A
(Appendix to the standard)
Pretreatment and regeneration of resin
Put the resin in a plastic container and rinse it with clean water until the water is clear. Soak the resin in water for 12h24h to allow it to fully expand. If it is dry resin, it should be soaked in saturated sodium chloride solution first, and then the sodium chloride solution should be gradually diluted to prevent the resin from suddenly expanding and breaking. Soak the resin in 1+6 hydrochloric acid solution twice the volume of the resin for 2h~4h, stirring occasionally. The resin can also be loaded into a column, and the acid solution is passed through the resin layer at a flow rate of 5.0mL/min~6.0mL/min by the dynamic method, and then the resin is washed from top to bottom (occasionally from bottom to top) with water until the pH of the effluent is 4, and then treated with 2%~5% sodium hydroxide solution, and then washed with water until it is slightly alkaline, and then treated with 1+6 hydrochloric acid solution again to make the resin hydrogen type. Finally, wash with water until it is neutral. Resin regeneration
After each sample elution and separation is completed, 400mL of 1+6 hydrochloric acid solution is passed through the resin bed to regenerate the resin. Before use, wash the resin slowly with water, and then wash at a flow rate of 5.0mL/min~6.0mL/min until the effluent is neutral (check with pH test paper). Keep the liquid level 1 cm above the resin layer, close the exchange column, and set aside. 7181 Woven bag packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm; the outer packaging adopts plastic woven bags, and its performance and inspection methods shall comply with the provisions of Type A of GB/T8946. The net weight of each bag is 10kg or 25kg. 6.3.2 Cardboard barrel packaging: The inner packaging adopts two layers of polyethylene plastic film bags with a thickness of not less than 0.05mm, and the outer packaging adopts cardboard barrels. The net weight of each barrel is 20kg.
6.4 Two sealing methods are used for industrial anhydrous potassium fluoride. 6.4.1 When woven bags are used for packaging, the two layers of inner bags are tied four times with vinyl ropes or other ropes of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the outer bag is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length is 7mm~12mm, the stitches are neat, and the stitch length is uniform. There is no leakage or skipping. 6.4.2 When using cardboard barrels for packaging, the two inner bags shall be tied four times with vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the cardboard barrels shall be covered and tightly bound. 6.5 Industrial anhydrous potassium fluoride shall be covered during transportation to prevent rain and moisture. 6.6 Industrial anhydrous potassium fluoride shall be stored in a cool and dry place to prevent rain and moisture. 717
A1 Pretreatment of resin
HG/T2829—1997
Appendix A
(Appendix to the standard)
Pretreatment and regeneration of resin
Put the resin in a plastic container and rinse it with clean water until the water is clear. Soak the resin in water for 12h24h to allow it to fully expand. If it is dry resin, it should be soaked in saturated sodium chloride solution first, and then the sodium chloride solution should be gradually diluted to prevent the resin from suddenly expanding and breaking. Soak the resin in 1+6 hydrochloric acid solution twice the volume of the resin for 2h~4h, stirring occasionally. The resin can also be loaded into a column, and the acid solution is passed through the resin layer at a flow rate of 5.0mL/min~6.0mL/min by the dynamic method, and then the resin is washed from top to bottom (occasionally from bottom to top) with water until the pH of the effluent is 4, and then treated with 2%~5% sodium hydroxide solution, and then washed with water until it is slightly alkaline, and then treated with 1+6 hydrochloric acid solution again to make the resin hydrogen type. Finally, wash with water until it is neutral. Resin regeneration
After each sample elution and separation is completed, 400mL of 1+6 hydrochloric acid solution is passed through the resin bed to regenerate the resin. Before use, wash the resin slowly with water, and then wash at a flow rate of 5.0mL/min~6.0mL/min until the effluent is neutral (check with pH test paper). Keep the liquid level 1 cm above the resin layer, close the exchange column, and set aside. 718
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