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GB/T 6009-2014Anhydrous sodium sulfate for industrial use (English PDF)

工业无水硫酸钠

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 8, 2014

Implementation date

December 1, 2014

Scope

GB/T 6009-2014 is the English-translated version of 工业无水硫酸钠.

GB/T 6009-2014 is the Chinese product standard for industrial anhydrous sodium sulfate, the salt cake used in enormous tonnages by the detergent, glass, textile dyeing, paper and tanning industries. Much of it is a by-product of other chemical processes rather than a mined mineral, which is precisely why the impurity limits carry the weight in this standard: the sodium sulfate content itself varies little, while the chloride, the iron, the water-insoluble matter, the calcium and magnesium and the moisture vary with the source and are what determine whether the material can be used in a glass furnace or in a dye bath. The document sets the grades and the requirements on each of those, the whiteness and the appearance, the test methods for each determination, the inspection rules including the sampling and the acceptance, and the requirements on marking, packaging, transport and storage. The 2014 edition replaces GB/T 6009-2003. For a producer, a trader or an industrial buyer verifying a delivery in China, this is the acceptance text.

Document preview — GB/T 6009-2014

National Standard of the People's Republic of China

Replacing: GB/T 6009-2003

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Scope
2 Normative references
3 Molecular formula and relative molecular mass...
4 Classification
5 Requirements
6 Test methods
6.3 Determination of sodium sulfate content
6.3.1 Weight method (arbitration method)
6.3.2 Calculation method
6.4 Determination of water insoluble content
6.4.1 Instruments
6.5 Determination of calcium and magnesium content
6.5.1 Atomic absorption method (arbitration method)
6.6.2 Silver quantity method
6.6.2.2 Reagents
6.7 Determination of iron content
6.7.2 Reagents
6.7.4 Drawing of working curve According to the provisions of
6.7.5 Analytical procedures
7 Inspection rules
8 Markings and labels
9 Packaging, transportation, storage

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 6009-2003 "Anhydrous sodium sulfate for industrial use". As compared with GB/T 6009-2003, in addition to editorial changes, the main technical changes are as follows: - ADJUST the technical requirements of the product to improve the requirements of category-I superior products; ADD the pH requirement of the aqueous solution of product (50 g/L) (see 5.2;

4.2 of the 2003 edition); - In the determination method of calcium and magnesium content, ADD the atomic absorption method (see 6.5;

5.5 of the 2003 edition); - In the determination of chloride content, ADD the silver amount method (see 6.6;

5.6 of the 2003 edition); - ADD the determination method of pH (see 6.10). This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard shall be under the jurisdiction of the Inorganic Chemical Branch of the National Chemical Standardization Technical Committee (SAC/TC 63/SC 1). Drafting organizations of this standard. Hunan Hengyang Xinyi Chemical Co., Ltd., CNOOC Tianjin Chemical Research and Design Institute, Nanfeng Chemical Group Co., Ltd., Sichuan Chuanmei Mirabilite Co., Ltd., Sichuan Hongyaqing Yijiang Yuanming Powder Co., Ltd., Tongbai Star Chemical Co., Ltd., Hechang (Pengshan) Chemical Co., Ltd., Jiangsu Yinzhu Chemical Group Co., Ltd., National Salt Chemical Product Quality Supervision and Inspection Center (Jiangsu). The main drafters of this standard. Liu Jian, Lu Siwei, Chen Aibing, Zou Huarong, Huang Guifang, Wu Guoyu, Zhou Zhaogang, Wang Yigui, Chen Changyi. This standard replaces the standard previously issued as follows: - GB 6009-1985, GB/T 6009-1992, GB/T 6009-2003. Anhydrous sodium sulfate for industrial use

1 Scope

This standard specifies the classification, requirements, test methods, inspection rules, marking, labeling, packaging, transportation, storage of anhydrous sodium sulfate for industrial use. This standard applies to anhydrous sodium sulfate for industrial use. This product is mainly used as the industrial raw materials such as battery, optical glass, printing-dyeing, synthetic detergent, vinylon, dye, ordinary glass, paper industry, fiber production, inorganic salt, etc.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.

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 6682-2008 Water for analytical laboratory use - Specification and test methods

GB/T 8170 Rules for rounding off for numerical values & expression and judgement of limiting values

GB/T 23769-2009 Inorganic chemical products - General method for the determination of pH values

3 Molecular formula and relative molecular mass Molecular formula. Na2SO4.

Relative molecular mass. 142.02 (according to 2011 international relative atomic mass).

4 Classification

According to the use of anhydrous sodium sulfate for industrial use, it is divided into three categories.

5 Requirements

5.1 Appearance. Anhydrous sodium sulfate for industrial use is white crystalline particles.

5.2 Anhydrous sodium sulfate for industrial use shall meet the requirements of Table 1.

6 Test methods

Warning. Some of the reagents used in this test method are toxic or corrosive. The operator shall be careful! If splashed on the skin, rinse immediately with water. In severe cases, treat immediately. When using flammable products, it is strictly forbidden to use an open flame to heat it.

6.2 Appearance inspection The appearance is visually judged on a white-surface watch glass or a white porcelain plate under natural light.

6.3.1 Weight method (arbitration method)

6.3.1.5 Calculation of results The sodium sulfate content is calculated based on the mass fraction w1 of sodium sulfate (Na2SO4) through the formula (1).

6.3.2 Calculation method

6.3.2.1 Summary of method The mass fractions of water insoluble, magnesium sulfate, sodium chloride, iron sulfate, moisture, acidity or alkalinity are subtracted from 100 to obtain the sodium sulfate content.

6.4.1 Instruments

6.4.1.1 Glass mortar. The filter plate has a pore size of 5 µm ~ 15 µm.

6.4.1.2 Electrothermal constant temperature drying oven. The temperature can be controlled at 105 °C ± 2 °C.

6.5.1 Atomic absorption method (arbitration method)

6.5.1.1 Summary of method After the sample is dissolved, in a nitric acid medium, use the release agent cesium chloride and the deionization agent cesium chloride to eliminate the ionization interference. The calcium and magnesium ions are determined by a flame atomic absorption spectrophotometer at wavelengths of 422.6 nm and 286.2 nm, respectively.

6.5.1.2 Reagents 6.5.1.2.1 Nitric acid solution. 1 + 9.

6.5.1.3 Instruments Flame atomic absorption spectrophotometer. It is equipped with calcium and magnesium cathode hollow lamps.

6.5.1.4 Analytical procedures 6.5.1.4.1 Preparation of test solution Weigh a certain amount of specimen (about 10 g for category-I superior products; about 1 g for category-II products; about

0.5 g for category-III products; about

0.3 g for category-III products), accurate to

0.01 g. Place it in a 250 mL beaker. Add 50 mL of water and 20 mL of nitric acid solution. Heat to dissolve it. Continue boiling it for 5 min. After cooling it, transfer it all into a 500 mL (V1) volumetric flask. Use water to dilute it to the mark. Shake it uniformly. Dry filter it. Prepare for use.

6.6.2 Silver quantity method

6.6.2.1 Summary of method The chloride ions in the test solution are titrated by a silver nitrate standard titration solution under neutral or slightly alkaline conditions by the use of potassium chromate as an indicator.

6.6.2.2 Reagents

6.6.2.3 Instruments and equipment Micro-burette. The index value is

0.01 mL or

0.02 mL.

6.6.2.4 Analytical procedures Pipette 25 mL (V2) of test solution A (see 6.4.2). Place it in a 250 mL conical flask. Add water to about 100 mL. Add

0.5 mL of potassium chromate solution. Use the standard titration solution of silver nitrate to titrate it, until the solution forms a brick-red suspension that does not disappear, which is the end point.

6.7 Determination of iron content

6.7.1 Summary of method Same as Chapter 3 of GB/T 3049-2006.

6.7.2 Reagents

6.7.2.1 Hydrochloric acid.

6.7.2.2 Ammonia solution. 1 + 1. Others are the same as Chapter 4 of GB/T 3049-2006.

6.7.3 Instruments and equipment Spectrophotometer. Equipped with cuvettes which have a thicknesses of 2 cm and 5 cm.

6.7.4 Drawing of working curve According to the provisions of

6.3 of GB/T 3049-2006, use 2 cm and 5 cm cuvettes and the corresponding iron standard solution to draw the working curve, respectively.

7 Inspection rules

7.1 Inspection shall be carried out by type inspection and exit-factory inspection.

7.2 The anhydrous sodium sulfate for industrial use of the same specification produced by the same material continuously or by the same shift forms a batch. Each batch of products does not exceed 1000 t.

7.3 Determine the number of sampling units according to the provisions of GB/T 6678.When sampling, insert the sampler from the top of the package to 3/4 of the depth of the material layer.

7.4 If any indicators of the test results do not meet the requirements of this standard, it take sample from double quantity of packages for reinspection. Even if there is one indicator fails to meet the requirements of this standard during the reinspection, the whole batch of products is unqualified.

7.5 Use the rounding-off comparison method as specified in GB/T 8170 to determine whether the test results meet the standards.

8 Markings and labels

8.1 The packaging bags of anhydrous sodium sulphate for industrial use shall have a firm and clear marking, which indicates the manufacturer's name, site, product name, category, grade, net content, batch number or production date, this standard number, the "Avoid rain exposure" sign as specified in GB/T 191- 2008.

9 Packaging, transportation, storage

9.1 Anhydrous sodium sulfate for industrial use is packed in polyethylene plastic bags which are covered with plastic woven bags; or otherwise packed by laminated plastic woven bags and damp-proof composite paper bag. The inner bag is heat sealed or tied; the outer bag shall be firmly stitched. The net content of each bag is 25 kg, 50 kg, 100 kg, 400 kg, 1000 kg.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 27 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 3049-2006

Cited by

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