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HG/T 2680-2017 English PDF (HGT2680-2017)

HG/T 2680-2017 English PDF (HGT2680-2017)

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HG/T 2680-2017: Magnesium sulfate for industrial use

This standard specifies the category, requirements, test methods, inspection rules, signs, labels, packaging, transportation, storage of magnesium sulfate for industrial use. This standard applies to magnesium sulfate for industrial use, which is used in chemical industry, industrial dehydration, tanning, printing and dyeing, catalyst, papermaking, fireproof coating, plastic and fertilizer, etc.
HG/T 2680-2017
HG
CHEMICAL INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 71.060.50
G 12
Filing No.: 60532-2018
Replacing HG/T 2680-2009
Magnesium sulfate for industrial use
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ISSUED ON: NOVEMBER 07, 2017
IMPLEMENTED ON: APRIL 01, 2018
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Molecular formula and relative molecular mass ... 5
4 Categories ... 5
5 Requirements ... 5
6 Test method ... 6
7 Inspection rules ... 15
8 Signs, labels ... 16
9 Packaging, transportation, storage ... 17
Magnesium sulfate for industrial use
1 Scope
This standard specifies the category, requirements, test methods, inspection rules, signs, labels, packaging, transportation, storage of magnesium sulfate for industrial use. This standard applies to magnesium sulfate for industrial use, which is used in chemical industry, industrial dehydration, tanning, printing and dyeing, catalyst, papermaking, fireproof coating, plastic and fertilizer, etc.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) applies to this document. GB/T 191-2008 Packaging - Pictorial marking for handling of goods
GB/T 3049-2006 Chemical products for industrial use - General method for determination of iron content - 1,10-Phenanthroline spectrophotometric method GB/T 3051-2000 Inorganic chemical products for industrial use - General method for determination of chloride content - Mercurimetric method
GB/T 6678 General principles for sampling chemical products
GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 8170 Rules of rounding off for numerical values and expression and judgement of limiting values
HG/T 3696.1 Inorganic chemicals for industrial use Preparations of standard and reagent solutions for chemical analysis - Part 1: Preparations of standard volumetric solutions
HG/T 3696.2 Inorganic chemicals for industrial use - Preparations of standard and reagent solutions for chemical analysis - Part 2: Preparations of standard solutions for impurity
HG/T 3696.3 Inorganic chemicals for industrial use - Preparations of standard and reagent solutions for chemical analysis - Part 3: Preparations of reagent solutions 3 Molecular formula and relative molecular mass
Molecular formula: MgSO4. Relative molecular mass: 120.36 (according to the international relative atomic mass in 2016)
Molecular formula: MgSO4 ?€? H2O. Relative molecular mass: 138.38 (according to the international relative atomic mass in 2016)
Molecular formula: MgSO4 ?€? 7H2O. Relative molecular mass: 246.47 (according to the international relative atomic mass in 2016)
Molecular formula: MgSO4 ?€? nH2O (n is the average value of hydration, which is an integer between 2 and 6)
4 Categories
Magnesium sulfate for industrial use is divided into 4 categories:
- Category I, magnesium sulfate heptahydrate (MgSO4 ?€? 7H2O), which is mainly used in tanning, printing and dyeing, catalysts, papermaking, plastics, etc.; - Category II, magnesium sulfate monohydrate (MgSO4 ?€? H2O), which is mainly used in fireproof coatings, plastics and fertilizers;
- Category III, anhydrous magnesium sulfate (MgSO4), which is mainly used for industrial dehydration, etc.;
- Category IV, dry product of magnesium sulfate (MgSO4 ?€? nH2O), which is mainly used in tanning, printing and dyeing, catalyst, papermaking, plastics, etc. 5 Requirements
5.1 Appearance: Category I and category IV are white or colorless crystalline particles or powder; category II and category III are white or off-white solid particles or powder. 5.2 Magnesium sulfate for industrial use shall meet the requirements in Table 1, when tested according to the test methods specified in this standard.
black T as indicator; use ethylene diamine tetraacetic acid (EDTA) standard titration solution to titrate the total calcium and magnesium.
Under the condition of pH ??? 12.5 of the test solution, use calcium reagent carboxylate sodium salt as indicator; use ethylene diamine tetraacetic acid (EDTA) standard titration solution to titrate calcium. Subtract the calcium content from the total calcium and magnesium, to calculate the magnesium sulfate content.
6.4.2 Reagents or materials
6.4.2.1 Triethanolamine solution: 1 + 3.
6.4.2.2 Ammonia solution: 1 + 2.
6.4.2.3 Ammonia-ammonium chloride buffer solution A: pH ??? 10.
6.4.2.4 Sodium hydroxide solution: 50 g/L.
6.4.2.5 Ethylene diamine tetraacetic acid (EDTA) standard titration solution: c(EDTA) ??? 0.05 mol/L.
6.4.2.6 Ethylene diamine tetraacetic acid (EDTA) standard titration solution: c(EDTA) ??? 0.02 mol/L.
6.4.2.7 Chrome black T indicator.
6.4.2.8 Calcium reagent carboxylate sodium salt indicator.
6.4.3 Test procedure
6.4.3.1 Preparation of test solution
Weigh an appropriate amount of specimen (approximately 10 g for category I; approximately 5 g for category II and category III; approximately 5 g for category IV after burning according to the provisions of 6.10), accurate to 0.0002 g. Place it in a 250 mL beaker. Add 100 mL of water to dissolve it. Transfer all into a 250 mL volumetric flask. Use water to dilute it to the mark. Shake well. Dry filter it if necessary. Discard the initial 20 mL of filtrate. Keep the filtrate. This solution is test solution A, which is used for the determination of calcium and magnesium content, calcium content, chloride content.
6.4.3.2 Test
6.4.3.2.1 Determination of calcium and magnesium content
Pipette 10 mL of test solution A. Put it in a 250 mL conical flask. Add 40 mL of water, 5 mL of triethanolamine solution. Use ammonia solution, to adjust the pH to 7 ~ 8. Add 10 mL of ammonia-ammonium chloride buffer solution A and a small amount of solution (see 6.4.2.6), which is consumed by titrating the blank test solution, in milliliters (mL);
c2 - The exact value of the concentration of ethylene diamine tetraacetic acid (EDTA) standard titration solution (see 6.4.2.6), in moles per liter (mol/L);
m - The numerical value of the mass of the specimen, in grams (g);
M - The molar mass value of magnesium sulfate heptahydrate (MgSO4 ?€? 7H2O) [or magnesium (Mg), or magnesium sulfate (MgSO4)], in grams per mole (g/moL) (MMgSO4 ?€? 7H2O = 246.47, MMg = 24.305, MMgSO4 = 120.36).
Take the arithmetic mean of the parallel measurement results as the measurement result. The absolute difference between the two parallel measurement results is not more than 0.2%.
6.5 Determination of chloride content
6.5.1 Mercury method (arbitration method)
6.5.1.1 Principle
Same as Chapter 3 of GB/T 3051-2000.
6.5.1.2 Reagents or materials
6.5.1.2.1 Mercury nitrate standard titration solution: .
6.5.1.2.2 Others are the same as Chapter 4 of GB/T 3051-2000.
6.5.1.3 Instruments and equipment
Same as Chapter 5 of GB/T 3051-2000.
6.5.1.4 Test procedure
Pipette 50 mL of test solution A (see 6.4.3.1). Place it in a 250 mL conical flask. Add 3 drops of bromophenol blue indicator solution. Add nitric acid solution dropwise, until the solution changes from blue to yellow. Add another 5 drops in excess. Add 1 mL of diphenylazocarbohydrazide indicator solution. Use a micro-burette to make titration, using the mercury nitrate standard titration solution, until the solution changes from yellow to purple, which is the end point.
At the same time, do a blank test. Except that no specimen is added to the blank test solution, the types and amounts of other added reagents (except the standard titration solution) are the same as the test solution.
6.5.2.2.3 Chlorine standard solution: 1 mL of the solution contains 0.01 mg of chlorine (Cl).
Pipette 1 mL of chlorine standard solution, which was prepared according to HG/T 3696.2. Place it in a 100 mL volumetric flask. Use water to dilute it to the mark. Shake well. This solution is prepared before use.
6.5.2.3 Test procedure
Weigh 2.50 g ?? 0.01 g of specimen. Place it in a 50 mL beaker. Add an appropriate amount of water. Stir to dissolve it completely. Transfer to a 250 mL volumetric flask. Add water to the mark. Shake well. Pipette 5 mL (1 mL for category II first-grade products). Put it in a 50 mL colorimetric tube. Add 1 mL of nitric acid solution and 3 mL of silver nitrate solution. Use water to dilute it to the mark. Shake well. Let it stand for 10 min. The turbidity presented shall not be greater than the standard turbidimetric solution.
The standard turbidimetric solution is prepared as follows: pipette 2.50 mL of category I superior product, 10.00 mL of category I first-grade product and category III first- grade product, 5.00 mL of category II superior product, 15.00 mL of category II first- grade product, 1.50 mL of category III superior chlorine standard solutions. Put them in 50 mL colorimetric tubes. Then add 10 mL of water, 1 mL of nitric acid solution, 1 mL of silver nitrate solution, respectively. Use water to dilute it to the mark. Shake well. 6.6 Determination of iron content
6.6.1 Principle
Same as Chapter 3 of GB/T 3049-2006.
6.6.2 Reagents or materials
Same as Chapter 4 of GB/T 3049-2006.
6.6.3 Instruments and equipment
Spectrophotometer: It is equipped with 4 cm or 5 cm cuvette.
6.6.4 Test procedure
6.6.4.1 Drawing of standard curve
According to the provisions of 6.3 in GB/T 3049-2006, use a 4 cm or 5 cm cuvette and the corresponding amount of iron standard solution, to draw a working curve, which has an iron content of 0.01 mg ~ 0.1 mg.
6.6.4.2 Test
Pipette 10 mL of test solution A (see 6.4.3.1). Place it in a 100 mL volumetric flask. Proceed from "If necessary, add water to 60 mL ...", in 6.4 of GB/T 3049-2006. At the same time, do a blank test. Except that no specimen is added to the blank test solution, the types and amounts of other reagents added are the same as the test solution. 6.6.5 Test data processing
Iron content is calculated as the mass fraction w3 of iron (Fe), according to formula (3): Where:
m1 - The numerical value of the mass of iron in the test solution, which is detected from the standard curve, in milligrams (mg);
m0 - The numerical value of the mass of iron in the blank test solution, which is detected from the standard curve, in milligrams (mg);
m - The numerical value of the mass of the specimen, in grams (g).
Take the arithmetic mean of the parallel determination results as the measurement result. The absolute difference of the results of two parallel determinations: not more than 0.002% for the category II and category III first-grade products; not more than 0.0002% for the rest.
6.7 Determination of water-insoluble content
6.7.1 Principle
After the specimen is dissolved in water, it is filtered, rinsed, dried, baked until the mass is constant. The content of water-insoluble matter is determined according to the amount of residue after drying.
6.7.2 Reagents or materials
Barium chloride solution: 20 g/L.
6.7.3 Instruments and equipment
6.7.3.1 Glass sand filter: The pore size of the filter plate is 5 ??m ~ 15 ??m. 6.7.3.2 Electric constant temperature drying oven: The temperature can be controlled at 105 ??C ?? 2 ??C.
6.7.4 Test procedure
Pipette 1 mL of lead standard solution, which was prepared according to HG/T 3696.2. Place it in a 100 mL volumetric flask. Use water to dilute it to the mark. Shake well. This solution is prepared before use.
6.8.3 Test procedure
Weigh 1.00 g ?? 0.01 g of specimen. Place it in a 100 mL beaker. Add a small amount of water to dissolve it. Use hydrochloric acid solution, to adjust it to pH ??? 3.5. Then transfer it all to a 50 mL colorimetric tube. Add 5 mL of acetate buffer solution and 1 mL of sodium sulfide solution. Use water dilute it to the mark. Shake well. Let it stand for 10 min. Place it against a white background. Observe from above and from the side. The color shall not be darker than that of the standard colorimetric solution. The standard colorimetric solution is to pipette the lead standard solution (1.00 mL for category I superior products, 2.00 mL for category II and III superior products and category IV; 4.00 mL for category III first-grade products). Treat them in the same way as the specimen.
6.9 pH determination
6.9.1 Reagents or materials
CO2-free water.
6.9.2 Instruments and equipment
pH meter: The division value is 0.1, which is equipped with saturated calomel electrode and glass electrode.
6.9.3 Test procedure
Weigh 5.00 g ?? 0.01 g of specimen. Place it in a 200 mL beaker. Add 100 mL of carbon dioxide-free water. Stir to dissolve it completely. Use a pH meter to measure it. Take the arithmetic mean of the parallel measurement results as the measurement result. The absolute difference of the parallel measurement results is not more than 0.1 pH unit. 6.10 Determination of loss on ignition
6.10.1 Principle
Weigh a certain amount of specimen. Burn it at 450 ??C ?? 10 ??C, until the mass is constant. Determine the loss on ignition, according to the reduced mass of the specimen, before and after burning.
6.10.2 Instruments and equipment
6.10.2.1 Electric heating constant temperature drying oven: The temperature can be d) Where there is a big difference from the previous type inspection;
e) Where contract requires.
7.1.2 Exit-factory inspection
The 6 index items of magnesium sulfate content, chloride content, water insoluble content, heavy metal content, pH, loss on ignition, which are specified in the requirements, are exit-factory inspection items, which shall be inspected batch by batch. 7.2 The magnesium sulfate for industrial use of the same grade, which is produced continuously or by the same shift of the manufacturer, using the same material and basically the same production conditions, forms a batch. Each batch of products shall not exceed 200 t.
7.3 Determine the number of sampling units, according to the provisions of GB/T 6678. When sampling, insert the sampler vertically from the center of the bag to 3/4 of the depth of the material layer, for sampling. Mix the collected samples uniformly. Use the quartering method, to divide it to not less than 500 g. Divide the sample into two clean and dry containers. Seal them. Stick labels, to indicate the name of the manufacturer, product name, batch number, sampling date, the name of the sampler. One set is for inspection and the other is kept for future reference.
7.4 If any index of the inspection result does not meet the requirements of this standard, re-inspection shall be carried out by re-sampling from twice the amount of packaging. Even if only one indicator fails to meet the requirements of this standard, the whole batch of products is unqualified.
7.5 Use the rounding off comparison method, which is specified in GB/T 8170, to judge whether the test results meet this standard.
8 Signs, labels
8.1 There shall be firm and clear signs on the packaging bags of magnesium sulfate for industrial use, including: manufacturer name, factory address, product name, category, grade, net content, batch number or production date, this standard number, as well as the signs of "Avoid exposure to sun" and "Avoid rain" as specified in Chapter 2 of GB/T 191- 2008.
8.2 Each batch of exit-factory magnesium sulfate for industrial use products shall be accompanied by a quality certificate, including: manufacturer name, factory address, product name, category, grade, net content, batch number or date of production, sign, this standard number.

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