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GB/T 18711-2025: Test method of magnetite for use in coal preparation
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GB/T 18711-2002	English	339	Add to Cart	3 days [Need to translate]	Magnetite for use in coal preparation -- Test methods

GB/T 18711-2025: Test method of magnetite for use in coal preparation

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ICS 73.040 CCSD27 National Standards of the People's Republic of China Replaces GB/T 18711-2002 Test methods for magnetite powder used in coal preparation Published on 2025-08-29 Implemented on 2026-03-01 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of Contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Sampling and Sample Preparation 1 5.Moisture Determination 1 6.Particle size distribution determination 1 7.Determination of Magnetic Material Content 1 7.1 Key Point 1 7.2 Main Test Equipment 2 7.3 Step 2 7.4 Expression of Experimental Results 2 8.True density determination 3 8.1 Key Point 3 8.2 Test Liquid 3 8.3 Instruments 3 8.4 Sample 3 8.5 Step 3 8.6 Calibration (Blank Test) 3 8.7 Expression of Experimental Results 4 9.Determination of total iron content 4 10.Determination of ferrous oxide content 4 11.Sulfur content determination 4 Appendix A (Normative) Density of Distilled Water at Different Temperatures 5

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 18711-2002 "Test Methods for Magnetite Powder for Coal Preparation". Compared with GB/T 18711-2002, except for the structure... Aside from adjustments and editorial changes, the main technical changes are as follows. a) The scope of application has been changed (see Chapter 1, Chapter 1 of the.2002 edition); b) Added terms and definitions (see Chapter 3); c) Sampling and sample preparation have been changed (see Chapter 4, Chapter 3 of the.2002 edition); d) The determination of moisture content was changed (see Chapter 5, Chapter 4 in the.2002 edition); e) Sample preparation prior to laboratory analysis has been removed (see Chapter 5 of the.2002 edition); f) The determination of particle size composition has been modified (see Chapter 6, Chapter 6 of the.2002 edition); g) The key points, main test equipment, magnetic field strength, units, and expression of test results for determining the content of magnetic materials have been changed (see 7.1, 7.2). 7.3.2, 7.3.8, 7.4 (and 7.1, 7.2, 7.3.2, 7.3.8, 7.4 in the.2002 edition); h) The determination of true density has been modified (see Chapter 8, Chapter 8 of the.2002 edition); i) The description of the instrument, the amount of sample, and the expression of the test results in the true density determination have been changed (see 8.3, 8.4, 8.9,.2002 edition). (8.3, 8.4, 8.9) j) The requirements for the temperature and number of measurements for true density determination have been removed (see sections 8.5 and 8.6 of the.2002 edition); k) The determination of ferrous oxide content has been changed (see Chapter 10, Chapter 10 of the.2002 edition); l) Sulfur content determination has been added (see Chapter 11); m) increased the density of distilled water at different temperatures (see Appendix A). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China National Coal Association. This document is under the jurisdiction of the National Coal Standardization Technical Committee (SAC/TC42). This document was drafted by. China Coal Technology & Engineering Group Tangshan Research Institute Co., Ltd. and Huaneng Coal Technology Research Co., Ltd. The main drafters of this document are. Zhang Liqiang, Qian Aijun, Pan Bo, Liu Dong, Liu Jinlong, Zhang Yifan, Gu Leiyu, and Feng Laihong. This document was first published in.2002, and this is its first revision. Test methods for magnetite powder used in coal preparation 1.Scope This document describes the sampling and preparation of magnetite powder for coal preparation, including moisture determination, particle size distribution determination, magnetic content determination, and true density. Methods for determining total iron content, ferrous oxide content, and sulfur content. This document applies to magnetite powder used in coal preparation.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 6730.2 Determination of moisture content in iron ore by gravimetric method GB/T 6730.5 Determination of total iron content in iron ore by titration after reduction with titanium trichloride GB/T 6730.8 Determination of ferrous content in iron ore by potassium dichromate titration method GB/T 6730.16 Determination of Sulfur Content in Iron Ore by Barium Sulfate Gravimetric Method GB/T 10322.1 Sampling and Sample Preparation Methods for Iron Ore GB/T 10322.7 Determination of particle size distribution of iron ore and direct reduced iron by sieve analysis 3.Terms and Definitions This document does not contain any terms or definitions that need to be defined. 4.Sampling and Sample Preparation Sampling and sample preparation shall be carried out in accordance with GB/T 10322.1. 5.Moisture content determination Moisture content determination shall be performed in accordance with GB/T 6730.2. 6.Particle size composition determination Particle size distribution was determined according to GB/T 10322.7. 7.Determination of Magnetic Material Content 7.1 Key Points The sample particle size is < 0.25 mm. ...