GB/T 397-2022Commercial coal quality - Coal for coke making (English PDF)

3.1 Single coal

A medium that is produced from the same coal field and has the same degree of coalification.

3.2 blended coal

The product obtained after washing and blending coal of different coalification degrees.

4.1 General requirements

Commercial coal for coking is divided into single coal and blended coal; the quality grade of commercial coal for coking is divided according to ash and sulphur, and expressed in the form of "category + ash grade + full sulphur grade".

4.2 Product Classes

4.2.1 Basis for classification of product categories

Commercial coals for coking are classified according to the random reflectance distribution of the specular body and its coefficient of variation into individual coals and combined coals:

Single coal: C.V<=10, at the same time, there is no notch in the reflectivity distribution of the specular body, and it is judged according to the requirements of GB/T 15591.

Combined coal: C.V>10.

Note:C.V=s /R... ×C.V is the coefficient of variation of specular random reflectance string, R. is the mean value of specular random reflectance, s is the standard deviation of specular random L reflectance.

4.2.2 Single coal

Single coal in accordance with the provisions of GB/T 5751 to determine its coal type, coking coal coal type are; gas coal, gas fertilizer coal, 1/3 coking coal, fat coal, coking coal, lean coal.

4.2.3 Matching coal

Combined coal should not be named according to GB/T 5751 in the coal category. The matching coal shall ensure the stability of coal quality, and shall provide the proportion of each coal type in the matching coal or mirror reflectivity distribution chart.

Anthracite, poor coal, long-flame coal, weak viscous coal, non-viscous coal and other coal types shall not be used in the conventional coking coal without the consent of the user.

4.3 Quality requirements

4.3.1 Ash Rating

The single coal is divided into 5 grades according to the ash content (A.>), namely Al, eight A2, A3, A4 and A5; the matching coal is divided into 4 grades according to the ash content (A,), namely A1, A2, A3 and A4. The corresponding ash index requirements for each product grade are shown in Table 1.

GB/T 212 Industrial methods of analysis for coal

4.3.2 Full sulphur grades

Individual coals are divided into five grades according to their full sulphur (S.. ) is divided into 5 grades, S1, S2, S3, S4 and S5 respectively. The corresponding full sulphur index requirements for each product grade are shown in Table 2.

Table 2 Full sulphur grades and index requirements for coking coals

4.3.3 Other index requirements

Other index requirements for commercial coals for coking are shown in Table 3.

Table 3 Other index requirements for commercial coals for coking

4.4 Impurity Control Requirements

The control of impurities of commercial coal for coking shall conform to the requirements of GB/T 31087.

4.5 Product Catalogue

The product catalogue of commercial coal for coking is shown in Appendix A.

For further classification of ash and sulphur index of coking coal, please refer to Appendix B.

5.1 Total moisture

The total moisture of coal shall be determined in accordance with GB/T 211.

5.2 Ash, volatile matter

The determination of ash and volatile matter of coal should be carried out in accordance with GB/T 212 or GB/T 30732, and the slow ashing method in accordance with GB/T 212 when arbitrating the ash content of coal.

5.3 Specular reflectance distribution

Determination of the specular reflectance distribution of coal should be carried out according to GB/T6948 or GB/T 40485.

5.4 Microscopic components

The determination of microscopic components of coal should be carried out according to GB/T8899.

5.5 Total sulphur

The determination of total sulphur of coal should be carried out according to GB/T 214 or GB/T 25214, and the arbitration should be carried out according to the Ashoka method in GB/T 214.

5.6 Phosphorus content

The determination of phosphorus content in coal should be carried out according to GB/T 216.

5.7 Chlorine content

Determination of chlorine content in coal should be carried out in accordance with GB/T 3558.

5.8 Arsenic content

The determination of arsenic content in coal shall be carried out in accordance with GB/T 3058, GB/T 39538 or SN/T 3521.

5.9 Mercury content

The determination of mercury content in coal should be carried out according to GB/T 16659, GB/T 39538, SN/T 3511 or SN/T 3521.

5.10 Fluorine content

The determination of fluorine content in coal shall be carried out in accordance with GB/T 4633.

5.11 Potassium and sodium content

According to the conversion of potassium and sodium content in coal ash, the determination of potassium and sodium content in coal ash should be carried out in accordance with GB/T 1574.

5.12 Binding index

Adhesion index should be determined in accordance with the provisions of GB/T 5447.

5.13 Colloidal layer index

Gum layer index should be determined according to the provisions of GB/T 479 implementation.

5.14 Oa swelling degree

Oa swelling degree should be determined in accordance with the provisions of GB/T 5450,

5.15 Gee's flow

Gee's flow measurement should be carried out in accordance with the provisions of GB/T 25213.

5.16 Coke reactivity and strength after reaction

Using MT/T 118l or YB/T4526 for coke making test, the coke reactivity and post-reaction strength should be determined according to the provisions of GB/T 4000.

6.1 Group Batch

The products are tested according to batches.

6.2 Sampling and preparation

Products according to GB/T475 or GB/T 19494.1 provisions to take, according to GB/T474 or GB/T19494.2 provisions of the preparation.

6.3

factory inspection production enterprises, distribution enterprises should be in accordance with the requirements of Table 4 test items. Factory inspection.

Table 4 test items table

6.4 Type test

6.4.1

The following cases, should be type test:

a) new product design finalization and identification of batch production finalization:

b) formal production, raw materials, processes and equipment changes;

c) formal production, every six months or every change in a batch of raw materials for an inspection d) interruptions in mass production, and resumption of production after the cessation of production e) national or local market supervision departments to type test requirements.

6.4.2

type test items should be consistent with the requirements of Table 4.

6.5 Judgement rules

The quality of commercial coal for coking shall be judged according to the provisions of Table 1~Table 3. If the results of factory inspection and type inspection meet the requirements, the batch of products shall be judged to be qualified.

7.1 Marking

7.1.1

The production and sale of commercial coal for coking shall be marked in accordance with the provisions of GB/T25209.

7.1.2

The marking shall include, but not be limited to, the following information as a document accompanying the circulation of commercial coal for coking:

Product name;

---Quantity;

-- Origin;

--Nominal maximum particle size or description of appearance

--Major coal quality indicators; including, but not limited to, those specified in Chapter 4:

--other t the name and address of the producer or distributor, date of production, batch number, product standard number, etc.

7.1.3

The label shall be made of waterproof, corrosion-proof and unbreakable material, which is easy to maintain for a long time.

7.2 Transportation and Storage

The transportation of commercial coal for coking. Storage shall be dustproof, rainproof, moistureproof and away from ignition sources.

Appendix A (informative)Catalogue of commercial coals for coking

Table A.1 gives a product catalogue of commercial coals for coking. Commercial coal for coking is expressed in the form of "ash grade + full sulphur grade + category", and the product codes are in the form of "category Chinese abbreviation - A-S". Of these, 25 are individual coals and 12 are blended coals.

Appendix B (informative)Detailed Classification of Ash and Sulphur Classes of Raw Coal for Coking Class Requirements

The detailed classification requirements for ash and sulphur of raw coals for coking are shown in Table B1.