GB/T 4757-2025 Methods for the batch-flotation testing of fine coal English, Anglais, Englisch, Inglés, えいご
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ICS 73. 040 CCS D 27
National Standard of the People's Republic of China
GB/T 4757-2025
Replace GB/T 4757-2013
Methods for the Batch-Flotation Testing of Fine Coal
Issued on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
Standardization Administration of China
Contents
Scope
Normative References
Terms and Definitions
Coal Samples
Test Equipment and Utensils
Calculation of Test Coal Sample and Flotation Reagent Dosage
Comparative Flotation Tests
Flotation Parameter Tests
Appendix A (Normative) Specifications for Single-Tank Flotation Machines Used in Coal Preparation Laboratories
1. Scope
This document specifies the coal samples, test equipment and utensils, calculation of test coal samples and flotation reagent dosage, comparative flotation tests, and flotation parameter tests for laboratory batch-flotation testing of fine coal.
It applies to bituminous coal and anthracite.
2. Normative References
The following documents contain provisions which, through reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies; for undated references, the latest edition (including amendments) applies.
GB/T 211: Determination of total moisture in coal
GB/T 212: Proximate analysis of coal
GB/T 213: Determination of calorific value of coal
GB/T 214: Determination of total sulfur in coal
GB/T 475-2008: Manual sampling methods for commercial coal samples
GB/T 477: Sieve analysis of coal
GB/T 30049-2013: Washability test methods for coal core samples
GB/T 34164: Evaluation of flotation process performance in coal preparation plants
3. Terms and Definitions
This document has no terms and definitions to be defined.
4. Coal Samples
4.1 Coal Core Samples
After reduction according to Section 5 of GB/T 30049-2013, coal fines with particle size less than 0.5 mm (or the intended flotation size in the process) are obtained, with a mass of no less than 1 kg.
4.2 Coal Seam or Production Samples
After sieve analysis according to GB/T 477, coal fines with particle size less than 0.5 mm (or the intended flotation size in the process) are reduced from both natural and crushed fractions, blended proportionally to their original coal content, and weighed no less than 10 kg.
4.3 Flotation Feed from Coal Preparation Plants
Sampled according to Section 6 of GB/T 475-2008, flotation feed without any flotation reagents is filtered, dried, and weighed no less than 10 kg.
4.4 Analysis and Storage
4.4.1 Analytical Testing
Conduct the following analyses (additional items may be included as needed) according to GB/T 211, GB/T 212, GB/T 213, and GB/T 214:
Moisture (Mad);
Ash content (Ad);
Total sulfur (St,d).
4.4.2 Sieve Analysis
Perform sieve analysis according to GB/T 477.
4.4.3 Storage
Dry the test coal samples to air-dry condition, store them in sealed containers in a dry place, and limit storage time to no more than 10 months.
