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Brown coal floatation method

A technology for lignite and upgraded coal, which is used in flotation, solid separation, petroleum industry, etc.

Inactive Publication Date: 2013-10-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is, for the difficult problem of lignite flotation at present, proposes a kind of lignite flotation method, realizes lignite flotation conveniently and effectively, and Effectively reduce the ash content of upgraded coal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment discloses a lignite flotation method. Lignite from the Yuanbaoshan Mining Area in Chifeng City, Inner Mongolia is selected as a raw material, and conventional flotation equipment is used. The lignite flotation method described in this embodiment specifically includes the following steps:

[0034] First, the upgraded coal obtained by subjecting lignite to low-temperature pyrolysis (thermal upgrading) at 300°C has an ash content of 17.13%; after the upgraded coal is crushed to a particle size of less than 0.5mm, it is configured into The concentration of the pulp is 60g / L, the mixing speed of the pulp is 2100r / min, and the air volume is 300L / h. The collision between the upgraded coal particles and the air bubbles will make the upgraded coal particles adhere to the surface of the air bubbles in time and separate from the tailing coal or ash. separation;

[0035] Then, pre-stirring for 2min, adding kerosene to the slurry, the amount of kerosene added is 3.5k...

Embodiment 2

[0039] This embodiment discloses a lignite flotation method. Lignite from the Yuanbaoshan mining area in Chifeng City, Inner Mongolia is selected as a raw material, and conventional flotation equipment is used. The lignite flotation method described in this embodiment specifically includes the following steps:

[0040] First, the upgraded coal obtained by subjecting lignite to low-temperature pyrolysis (thermal upgrading) at 400°C has an ash content of 18.87%; after the upgraded coal is crushed to a particle size of less than 0.5mm, it is configured into The concentration of the pulp is 60g / L, and the mixing speed of the configured pulp is: 2100r / min, and the aeration volume is 300L / h;

[0041] Then, pre-stirring for 2min, adding kerosene to the slurry, the amount of kerosene added is 3.5kg / t;

[0042] Finally, stir for 1 min, then add 2-octanol to the pulp, the amount of 2-octanol added is 0.462kg / t, after 10s, scrape at a speed of 30r / min for 3min, and control the water repl...

Embodiment 3

[0045] This embodiment discloses a lignite flotation method. Lignite from the Yuanbaoshan mining area in Chifeng City, Inner Mongolia is selected as a raw material, and conventional flotation equipment is used. The lignite flotation method described in this embodiment specifically includes the following steps:

[0046] First, the upgraded coal obtained by subjecting lignite to low-temperature pyrolysis (thermal upgrading) at 500°C has an ash content of 20.84%; after the upgraded coal is crushed to a particle size of less than 0.5mm, it is configured into The concentration of the pulp is 60g / L, and the mixing speed of the configured pulp is: 2100r / min, and the aeration volume is 300L / h;

[0047] Then, pre-stirring for 2min, adding kerosene to the slurry, the amount of kerosene added is 3.5kg / t;

[0048]Finally, stir for 1 min, then add 2-octanol to the pulp, the amount of 2-octanol added is 0.462kg / t, after 10s, scrape at a speed of 30r / min for 3min, and control the water reple...

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PUM

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Abstract

The invention provides a brown coal floatation method, which includes the following steps: performing low temperature pyrolysis to brown coal to obtain upgraded coal; preparing upgraded coal into ore pulp; premixing, and adding collecting agent into the ore pulp; mixing, adding foaming agent into the ore pulp, removing foam, meanwhile controlling water replenishing speed to keep the liquid level of the ore pulp constant during the foam removing period, shutting off a flotation machine, stopping replenishing water, and suction filtrating clean coal and tailing coal to obtain a product. The brown coal floatation method is reasonable and scientific in steps, overcomes the defects of the prior art, can conveniently and efficiently realize floatation of brown coal, and can efficiently lower the ash content of the upgraded coal.

Description

technical field [0001] The invention relates to coal cleaning technology, in particular to a lignite flotation method. Background technique [0002] my country is a country poor in oil, low in gas, and relatively rich in coal resources. Coal plays an extremely important role in my country's national economic and social development. In 2008, my country's coal output reached 2.793 billion tons. As China's basic energy, coal accounts for about 70% of primary energy. In the next 20 years, coal will still be the most important energy source in our country. [0003] According to the volatile content of coal, China divides all coal into lignite, bituminous coal and anthracite. Among them, lignite resource reserves account for about 13% of my country's total coal reserves, mainly distributed in the three northeastern provinces, Inner Mongolia Autonomous Region and Yunnan Province. The efficient, clean and rational utilization of lignite resources has very important strategic sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00C10B49/00
Inventor 张秋民何德民关珺梁延峰
Owner DALIAN UNIV OF TECH