GB/T 24521-2018Method for the determination of specific resistance of carbon raw materials and coke (English PDF)

Foreword

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

This Standard replaces GB/T 24521-2009 "Method for the determination of specific resistance of coke". Compared with GB/T 24521-2009, main content changes in this Standard are as follows.

-- modified the standard's name to "Method for the determination of specific resistance of carbon raw materials and coke";

-- modified the scope (see Clause 1 of this Edition, Clause 1 of Edition 2009);

-- modified the instruments and equipment (see Clause 4 of this Edition, Clause 4 of Edition 2009);

-- modified the requirements for preparation of particle size of specimen (see 5.3 of this Edition, 5.2 of Edition 2009);

-- modified the test steps (see Clause 6 of this Edition, Clause 6 of Edition 2009);

-- modified the results calculation (see Clause 7 of this Edition, Clause 7 of Edition 2009);

-- modified the precision (see Clause 8 of this Edition, Clause 7 of Edition 2009).

1 Scope

This Standard specifies method for the determination of specific resistance of carbon raw materials and coke powders.

This Standard is applicable to the determination of specific resistance of raw materials for carbon production such as anthracite, graphite, roasted and crushed, calcined petroleum coke, graphitized coke, needle coke, as well as coke powders.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 1997, Coke-sampling and preparation of samples

3 Method principle

Put a dry specimen with a certain particle size into the specimen tank. Pass a certain intensity of current under a certain pressure.

4 Instruments and equipment

5 Sampling and specimen preparation

5.1 For cokes, it shall be carried out according to GB/T 1997.

5.3 Crush the shrunken specimen 3~4 times to make them all pass the 0.5mm square hole standard sieve.

6 Test steps

7 Results calculation

Calculate the resistance of powder, rho, according to formula (1).

8 Precision

9 Inspection report

The inspection report shall at least contain the following information. […]