GB/T 19224-2017Determination of the relative degree of oxidation in bituminous coal (English PDF)

Foreword

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

This standard replaces GB/T 19224-2003 "Determination of relative oxidation of bituminous coal." This standard compared with GB/T 19224-2003, In addition to editorial changes, the main technical content changes as follows.

--- Increasing the wetting agent (see 4.1);

--- The test coal particle size from less than 3mm to less than 0.2mm (see 6.1,.2003 Edition Chapter 6);

--- Added "test report" chapter (see Chapter 9).

1 Scope

This standard specifies the method of alkaline extraction method for determination of relative oxidation of bituminous coal feed, reagents and materials, equipment, determination steps, the results of the meter Computation and expression, method precision and test report.

This standard applies to natural conditions of bituminous coal oxidation.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 483 Methods of analysis of coal - General provisions of test methods

3 Method summary

A certain amount of bituminous coal extract with sodium hydroxide solution after the oxidation of humic acid, the alkali extract colorimetric determination, according to the solution of Light transmittance to determine the relative oxidation of bituminous coal.

4 Reagents and materials

Unless otherwise specified, only reagents identified as analytically pure and distilled or deionized water or rather pure water are used in the assay.

4.1 Wetting agents. Octylphenoxypolyethoxyethanol nonionic surfactant, 100% strength, should not be diluted.

Note Wetting agents can also use 20g/L sodium lauryl sulfate solution.

4.2 sodium hydroxide solution .1mol/L. Weigh sodium hydroxide 40g, dissolved in water and diluted to 1000mL.

4.3 filter paper. Qualitative medium-speed filter paper.

5 Equipment