GB/T 40503-2021Measuring methods of secondary coal slime content in coal preparation plant (English PDF)
选煤厂次生煤泥量的测定方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 20, 2021
Implementation date
March 1, 2022
Scope
GB/T 40503-2021 is the English-translated version of 选煤厂次生煤泥量的测定方法.
GB/T 40503-2021 gives the methods for measuring how much secondary coal slime is generated in a coal preparation plant. It covers the method summary, equipment, measuring procedures and the calculation of results, and applies to wet coal preparation plants.
The document defines primary coal slime content, secondary coal slime content, total slime content and filter cake bulk density, the slime contents being expressed as mass percentages of the raw coal.
Two methods are given: testing the primary and total slime in each production shift and taking the difference, or obtaining both figures by statistical calculation from the plant's monthly comprehensive test report.
It draws on the moisture, sample preparation, screening and float-sink tests of GB/T 211, GB/T 474, GB/T 477 and GB/T 478. It was issued on 20 August 2021 and has applied since 1 March 2022.
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Document preview — GB/T 40503-2021
National Standard of the People's Republic of China
- ICS
- 73.040
- Classification
- D 21
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Method summary
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.
1 Scope
This document specifies the method summary, equipment, measurement procedures and result calculations for the determination of the amount of secondary slime in the coal preparation plant.
This document is applicable to the determination of the amount of secondary slime in a wet coal preparation plant.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 211 Method for determination of total moisture in coal
GB/T 474 Coal sample preparation method
GB/T 477 Coal screening test method
GB/T 478 Coal float-sink test method
Technical inspection of MT/T 808 coal preparation plant
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Primary coal slime content
The mass percentage of the raw coal with a particle size of less than 0.5mm.
3.2 Secondary coal slime content
The secondary slime produced in the whole production process of the coal preparation plant accounts for the mass percentage of the raw coal.
3.3 Total slime content
After the coal preparation plant is sorted, the total of all products with a particle size of less than 0.5mm will account for the mass percentage of the raw coal.
3.4 Filter cake bulk density
The mass of the filter cake per unit volume including solid particles, moisture, and pores.
4 Method summary
There are two methods for determining the amount of secondary slime.
Method 1. Test the amount of primary slime and the total amount of slime in each production class, the difference between the total amount of slime and the amount of primary slime, that is, the amount of secondary slime.
Method 2. According to the monthly comprehensive test report of the coal preparation plant, use the statistical calculation method to obtain the amount of primary slime and the total amount of slime in the coal preparation plant. The difference between the amount of coal and the amount of primary slime is the amount of secondary slime.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 211-2017 — Determination of total moisture in coal
GB/T 474-2008 — Method for preparation of coal sample
GB/T 477-2008 — Method for size analysis of coal
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GB/T 40503-2021
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