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A kind of lignite flotation method

A technology for lignite and dry coal slime is applied in the field of coal flotation, which can solve the problems of low yield of clean coal products and poor foam stability, and achieve the effects of improving utilization efficiency, improving stability and improving flotation recovery effect.

Inactive Publication Date: 2017-08-25
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the lignite flotation process, the stability of the foam is poor, and the amount of solids carried by the foam is small, resulting in a low yield of clean coal products, which has not been paid enough attention.

Method used

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  • A kind of lignite flotation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example discloses a lignite flotation method. Lignite with an ash content of 21.53%, a moisture content of 18.75%, and a particle size of less than 0.5 mm is selected as the raw material for flotation, and coking coal with an ash content of 8.81%, ash content of 2.98%, and a particle size of less than 0.074 mm is selected. (a type of bituminous coal) as buoyant particles. A standard laboratory hanging cell unit flotation machine (1.5 L) was used to carry out the flotation test. The stirring speed of the flotation machine was 1800 rpm, and the air volume was 0.25 m 3 / h. Kerosene is used as a collector with an amount of 2 kg / t; sec-octanol is used as a foaming agent with an amount of 0.5 kg / t. The water in the test process is deionized water, and the solid mass percentage concentration of the slurry is 6%. The mass ratio of buoyant particles to lignite particles is 1:2, that is, 30g of buoyant particles and 60g of lignite particles. Specifically include the follo...

Embodiment 2

[0040]This example discloses a lignite flotation method. Lignite with an ash content of 21.53%, a moisture content of 18.75%, and a particle size of less than 0.5 mm is selected as the raw material for flotation, and coking coal with an ash content of 8.81%, ash content of 2.98%, and a particle size of less than 0.074 mm is selected. (a type of bituminous coal) as buoyant particles. A standard laboratory hanging cell unit flotation machine (1.5 L) was used to carry out the flotation test. The stirring speed of the flotation machine was 1800 rpm, and the air volume was 0.25 m 3 / h. Kerosene is used as a collector with an amount of 2 kg / t; sec-octanol is used as a foaming agent with an amount of 0.5 kg / t. The water in the test process is deionized water, and the solid mass percentage concentration of the slurry is 6%. The mass ratio of buoyant particles to lignite particles is 1:1, that is, 45g of buoyant particles and 45g of lignite particles. The specific test steps of Exam...

Embodiment 3

[0043] This example discloses a lignite flotation method. Lignite with an ash content of 21.53%, a moisture content of 18.75%, and a particle size of less than 0.5 mm is selected as the raw material for flotation, and coking coal with an ash content of 8.81%, ash content of 2.98%, and a particle size of less than 0.074 mm is selected. (a type of bituminous coal) as buoyant particles. A standard laboratory hanging cell unit flotation machine (1.5 L) was used to carry out the flotation test. The stirring speed of the flotation machine was 1800 rpm, and the air volume was 0.25 m 3 / h. Kerosene is used as a collector with an amount of 2 kg / t; sec-octanol is used as a foaming agent with an amount of 0.5 kg / t. The water in the test process is deionized water, and the solid mass percentage concentration of the slurry is 6%. The mass ratio of buoyant particles to lignite particles is 2:1, that is, 60g of buoyant particles and 30g of lignite particles. The specific test steps of Exa...

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Abstract

The invention discloses a lignite flotation method, comprising the following steps: a. Add collector to water and stir for 0‑5min; b. Add lignite with a particle size of less than 0.5 mm to the water in step a, and stir for 0‑5min; c. Add buoyant particles to the slurry in step b, and stir for 0‑3min; d. Add foaming agent to the slurry in step c, and stir for 0-1min; e. Fill the pulp in step d with air bubbles for flotation, the flotation time is 3-10min, collect the particles floating out of the foam and the particles staying in the pulp respectively, as the final clean coal and tailings products. Beneficial effect: by adding a kind of flotation aid particles with low ash content, strong hydrophobicity and fine particle size in the lignite flotation process, the foam stability in the lignite flotation process is improved, thereby significantly improving the flotation recovery effect of lignite; flotation aid Granules and lignite particles are mixed as the final clean coal product to give full play to the use characteristics of different coal types, expand the application field of lignite, and improve the utilization efficiency of lignite.

Description

technical field [0001] The invention relates to a coal flotation method, in particular to a lignite flotation method. Background technique [0002] Coal is the most important energy source in my country, and its dominant position in the primary energy consumption structure will not change for a long time in the future. With the rapid development of the national economy, the demand for energy continues to increase, and the coal with medium and high metamorphic degrees is exploited and utilized in large quantities, and the reserves are decreasing day by day. However, low-metamorphic lignite with large reserves, shallow burial, and easy mining has not been well utilized. At present, lignite is mainly used for direct combustion for power generation, which leads to serious waste of resources and serious environmental pollution. Under the resource endowment conditions of "short of oil, less gas, and rich in coal" in our country, the comprehensive utilization and development of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/02
Inventor 夏文成倪超谢广元彭耀丽王伟杨怡陈胜张友飞
Owner CHINA UNIV OF MINING & TECH
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