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GB/T 4757-2025: Methods for the batch-flotation testing of fine coal
Status: Valid
GB/T 4757: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4757-2025 | English | 359 |
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Methods for the batch-flotation testing of fine coal
| Valid |
GB/T 4757-2025
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| GB/T 4757-2013 | English | 369 |
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Methods for the batch flotation testing of fine coal
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GB/T 4757-2013
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| GB/T 4757-2001 | English | 599 |
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Methods for the batch flotation testing of fine coal
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GB/T 4757-2001
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| GB 4757-1984 | English | 719 |
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Methods for the froth flotation testing of coal
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GB 4757-1984
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PDF similar to GB/T 4757-2025
Basic data
| Standard ID | GB/T 4757-2025 (GB/T4757-2025) |
| Description (Translated English) | Methods for the batch-flotation testing of fine coal |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | D27 |
| Classification of International Standard | 73.040 |
| Word Count Estimation | 18,114 |
| Date of Issue | 2025-08-29 |
| Date of Implementation | 2026-03-01 |
| Older Standard (superseded by this standard) | GB/T 4757-2013 |
| Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China |
GB/T 4757-2025: Methods for the batch-flotation testing of fine coal
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4757-2025
ICS 73.040
CCSD27
National Standards of the People's Republic of China
Replaces GB/T 4757-2013
Laboratory Unit Flotation Test Method for Pulverized Coal (Sludge)
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
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 supersedes GB/T 4757-2013 "Laboratory Unit Flotation Test Method for Powdered Coal (Slurry)" and is consistent with GB/T 4757-2013.
Aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) The instructions for coal sample preparation have been revised (see 3.1, 3.2, 3.3; 3.1, 3.2, 3.3 in the.2013 edition);
b) The analytical assays have been modified (see 3.4.1,.2013 version 3.4.1);
c) The formula for calculating flotation reagent dosage and the units of measurement have been changed (see 5.2,.2013 version 5.2);
d) The pulp concentration values specified for comparability testing have been changed (see 6.1.3,.2013 version of 6.1.3);
e) The range of pulp concentration and impeller speed specified for the flotation condition selection test has been changed (see 7.3.1,.2013 version 7.3.1);
f) A tailings scavenging test method has been added (see 7.4.5);
g) The reference form for the validation test record form has been revised (see 7.4.6, 7.4.5 of the.2013 version);
h) The final product testing items in the qualification test have been changed (see 7.5.3,.2013 version 7.5.3).
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., Tiandi (Tangshan) Mining Technology Co., Ltd., and Huaneng Coal Technology Co., Ltd.
Technology Research Co., Ltd.
The main drafters of this document are. Deng Mingrui, Xu Chentao, Shi Bingsen, Pan Bo, Bao Yuxin, Zheng Yunting, Liu Shengjie, Gu Leiyu, and Feng Laihong.
This document was first published in 1984, revised for the first time in.2001, revised for the second time in.2013, and this is the third revision.
Laboratory Unit Flotation Test Method for Pulverized Coal (Sludge)
1.Scope
This document specifies the coal sample, test equipment and tools, and the coal sample and flotation reagent dosage meter for laboratory unit flotation tests of pulverized coal (slurry).
Calculation, comparability flotation test and flotation parameter test.
This document applies to both bituminous coal and anthracite.
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 211 Determination of Total Moisture in Coal
GB/T 212 Industrial Analysis Methods for Coal
GB/T 213 Method for Determination of Calorific Value of Coal
GB/T 214 Determination of Total Sulfur in Coal
GB/T 475-2008 Manual sampling method for commercial coal
GB/T 477 Coal Screening Test Method
GB/T 30047 Method for evaluating the floatability of pulverized coal (slurry)
GB/T 30049-2013 Test Methods for the Washability of Coal Core Samples
GB/T 34164 Evaluation Method for Flotation Process in Coal Preparation Plants
3.Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4 Coal Samples
4.1 Coal samples taken from coal cores
According to Chapter 5 of GB/T 30049-2013, the particle size of the screened product should be less than 0.5 mm (or the particle size to be introduced into the flotation process).
The coal powder (degree) should be no less than 1 kg in weight.
4.2 Coal samples taken from coal seams or production coal samples
After sieving tests according to GB/T 477, the particles with a size less than 0.5 mm (or the particle size specified in the process flow) in both the natural and crushed grades were selected.
Coal powder of flotation particle size (at least 10 kg) shall be added and mixed in with the raw coal according to its proportion, and its mass shall not be less than 10 kg.
4.3 The feed material is sourced from the flotation process at the coal preparation plant.
Sampling was performed according to the sampling method specified in Chapter 6 of GB/T 475-2008, using flotation feed without any added flotation agents, followed by filtration and drying.
Finally, the total mass shall not be less than 10 kg.
4.4 Analytical Testing and Storage
4.4.1 The following items shall be performed in accordance with the relevant provisions of GB/T 211, GB/T 212, GB/T 213 and GB/T 214 (additions may be made as needed).
Analysis of (plus).
---Moisture (Mad);
---Ash Content (Ad);
---Total sulfur (St,d).
4.4.2 Conduct small sieve tests according to GB/T 477.
4.4.3 After the test coal samples are dried to an air-dry state, they should be stored in a sealed container in a dry place, and the storage time should not exceed [a certain period of time].
10 months.
5.Test equipment and tools
5.1 Test Equipment
Flotation machine. 1.5L volume, structural requirements as specified in Appendix A.
5.2 Test Equipment
The experimental equipment is shown in Table 1.
Table 1 Test Equipment
Serial Number Name Unit Quantity Specification
1.Timing device stage 1; Measurement range. 0 min ~ 10 min; Accuracy. 1 s
2 microsyringes, 0.5 mL capacity, 0.02 mL graduation.
3.Microsyringe (2 units) Volume. 0.25 mL; Graduation. 0.01 mL
4.Microsyringe (only 2 units). Capacity. 0.1 mL; Graduation. 0.002 mL
5.Microsyringes (2 units). Capacity. 0.025 mL; Graduation. 0.0005 mL
6.Electronic balance platform 1.Maximum weighing capacity..2000g; Sensitivity. 0.01g
7.Forced-air drying oven, temperature adjustable from 0℃ to 300℃.
8 large bowls, 50 each, capacity. 3L~6L
9 medium and small bowls, 50 in total, capacity. 1.5L~2.5L
10 large measuring cups (2 each) Capacity. 2L
11 Medium measuring cups (2 each) Capacity. 1L
12 wash bottles (2 each), capacity. 1L
6.Calculation of test coal sample and flotation reagent dosage
6.1 Calculation of the mass of the test coal sample
The mass of the test coal sample is calculated according to formula (1).
m=
V×ρ
100-Mad×
100 (1)
In the formula.
m --- Mass of the coal sample used in the experiment, in grams (g);
V --- Volume of the flotation tank, in liters (L);
ρ --- Pulp mass concentration, in grams per liter (g/L);
Mad --- Air-dried moisture content of the coal sample used in the experiment (%)
6.2 Calculation of Flotation Agent Dosage
When necessary, the amount of flotation agent can be converted according to formula (2) (based on dry coal slime).
V=
m×q
ρ×106
(2)
In the formula.
V --- The volume of flotation reagent added, in milliliters (mL);
m --- Mass of coal sample used in the experiment, in grams (g);
q --- Unit consumption of reagent (based on dry coal slime), in grams per ton (g/t);
ρ --- density of flotation reagent, in grams per cubic centimeter (g/cm3).
7 Comparability Flotation Test
7.1 Test Conditions
7.1.1 Water quality. Distilled water or ion-exchanged water, or tap water may be used.
7.1.2 Slurry temperature. (20±10)℃.
7.1.3 Slurry mass concentration. (80±1) g/L.
7.1.4 Collector and its unit consumption. n-dodecane, (1000±1) g/t (based on dry coal slime).
7.1.5 Foaming agent and its unit consumption. 4-methyl-2-pentanol, (100±1) g/t (based on dry coal slime).
7.1.6 Flotation machine impeller speed. 1800 r/min.
7.1.7 Flotation machine impeller diameter. 60mm.
7.1.8 Unit air volume of flotation machine. 0.25 m3/(m2·min).
7.2 Test Procedure
7.2.1 Add water to the flotation cell to the second mark, start and adjust the flotation machine until the impeller speed and unit air volume reach the specified values, then stop the machine and turn off the valve.
Close the air inlet valve and drain all the water from the flotation cell.
7.2.2 Add water to the flotation cell to the first mark. After starting the flotation machine, add the weighed coal sample (accurate to 0.1g) to the cell and stir until the coal...
After the sample is completely wetted, add water to bring the slurry level to the second mark.
7.2.3 After stirring for 2 minutes, add the collector below the surface of the slurry. After another 1 minute, add the foaming agent below the surface of the slurry.
7.2.4 After stirring for 10 seconds, open the air inlet valve and begin skimming the foam (manual or mechanical skimming). This should be done in accordance with changes in the foam layer thickness.
Collect concentrate foam in the widened trough (do not scrape out the slurry), control the water replenishment rate, and keep the slurry level constant throughout the foam scraping process. In the later stages of foam scraping,
Use a wash bottle to wash the particles from the flotation cell wall into the slurry.
7.2.5 After skimming for 3 minutes, stop skimming, close the air inlet valve and the stirring motor, and place the tailings into the basin. The tailings will settle at the bottom of the flotation cell.
Particles should be washed into the tailings basin. Particles adhering to the scraper, flotation cell lip, and cell wall should be collected into the clean coal product.
7.2.6 Add clean water to the flotation cell and start the flotation machine to stir and clean until the flotation cell is clean, then put it into a container for holding tailings.
7.2.7 After dehydrating each product separately, place them in a forced-air drying oven at a temperature not exceeding 75°C for drying. After cooling to an air-dry state, then...
Weigh and determine the ash content; if necessary, determine the sulfur content.
7.2.8 The original test records can be found in Table B.1 of Appendix B.
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