GB/T 23936-2018Sodium hexafluorosilicate for industrial use (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 23936-2009 "Industrial sodium fluorosilicate", compared with GB/T 23936-2009, except editorial modification The technical changes are as follows.

--- Typed (see Chapter 4);

---Delete the "Qualified Goods" level (see 4.2 of the 2009 edition);

--- Modified sulfate (as SO4), phosphorus pentoxide (P2O5) indicators (see 5.2, 2009 edition 4.2);

--- Remove the fineness (through the 250µm test sieve) indicators (see 4.2 of the 2009 edition);

--- Increase the indicator of heavy metals (see 5.2).

Warning

According to the provisions of Chapter 6 of GB 12268-2012, this product belongs to the toxic substance of item 6.1. When contacting, it should be safe.

Some of the reagents used in the test method are corrosive and should be handled with care. If necessary, it should be carried out in a fume hood. If splashed on the skin, rinse immediately with water. In severe cases, seek medical attention immediately.

1 Scope

This standard specifies the classification, requirements, test methods, inspection rules, marking, labeling, packaging, transportation and storage of industrial sodium fluorosilicate.

This standard applies to industrial sodium fluorosilicate. This product is used as a raw material for the production of fluorine chemical products. It can also be used as an enamel flux and glass emulsification. Coagulant, acid-resistant cement and acid-resistant concrete coagulant and wood preservatives.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB 190 dangerous goods packaging mark

GB/T 191-2008 packaging storage and transportation icon

GB/T 3049-2006 General method for determination of iron content of industrial chemical products 1,10-phenanthroline spectrophotometric method

General rules for sampling GB/T 6678 chemical products

GB/T 6682 Analytical laboratory water specifications and test methods

GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values

Inorganic chemical products -- Preparation of standard solutions, preparations and products for chemical analysis - Part 1. standard titration Liquid preparation

Standard Practice for Preparation of Standard Solutions, Preparations and Products for Chemical Analysis of Inorganic Chemical Products - Part 2. Impurity Standard Dissolution Liquid preparation

Preparation of standard solutions, preparations and products for chemical analysis - Part 3. Preparations and preparations Preparation

3 Molecular formula and relative molecular mass

Molecular formula. Na2SiF6

Relative molecular mass. 188.07 (according to 2016 international relative atomic mass)

4 Type

Industrial sodium fluorosilicate is divided into two types, type I (dry) and type II (semi-dry).

5 Requirements