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Method for removing carbon from gasification slag

A gasification slag and slurry technology, applied in chemical instruments and methods, solid separation, electrostatic effect separation, etc., can solve the problems of increased cost, secondary pollution, etc., and achieve the effects of low cost, rapid carbon removal, and easy operation

Active Publication Date: 2021-04-30
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the invention is simple, and can better realize the secondary recycling of coal gasification slag solid waste, but the use of activators, collectors, and foaming agents will increase costs and cause secondary pollution

Method used

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  • Method for removing carbon from gasification slag
  • Method for removing carbon from gasification slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 is used to illustrate the method for removing carbon from gasification slag according to the present invention.

[0045] The method for removing carbon by wet grinding and gasification slag in this embodiment comprises the following steps in sequence:

[0046] (1) Take 70 parts of gasification slag and add 30 parts of water, mix and stir to prepare slurry A with a solid content of 70%;

[0047] (2) Take 100 parts by mass of slurry A, add grinding media, place it in a stirring wet mill and wet grind until the particle size is 5 μm, sieve and take out the grinding media, and obtain slurry B;

[0048] Adopt following wet grinding process parameter in the step (2):

[0049] The grinding medium is zirconia grinding balls with a particle size of 0.5-3.0mm, the filling rate of the grinding medium is 70% by volume, the weight ratio of the ball to material is 1:4, and the stirring shaft speed of the wet mill is 400r / min. The grinding time is 60min.

[0050] (3) Put ...

Embodiment 2

[0055] Example 2 is used to illustrate the method for removing carbon from gasification slag according to the present invention.

[0056] The method for removing carbon by wet grinding and gasification slag in this embodiment comprises the following steps in sequence:

[0057] (1) Take 50 parts of gasification slag and add 50 parts of water, mix and stir to prepare slurry A with a solid content of 50%;

[0058] (2) Take 100 parts by mass of slurry A, add grinding media, place it in a stirring wet mill and wet grind until the particle size is 10 μm, sieve and take out the grinding media to obtain slurry B;

[0059] Adopt following wet grinding process parameter in the step (2):

[0060] The grinding medium is zirconia grinding balls with a particle size of 0.5-3.0mm, the filling rate of the grinding medium is 70% by volume, the weight ratio of the ball to material is 1:4, and the stirring shaft speed of the wet mill is 400r / min. The grinding time is 40min.

[0061] (3) Put t...

Embodiment 3

[0066] Example 3 is used to illustrate the method for removing carbon from gasification slag according to the present invention.

[0067] The method for removing carbon by wet grinding and gasification slag in this embodiment comprises the following steps in sequence:

[0068] (1) Take 30 parts of gasification slag and add 70 parts of water, mix and stir to prepare slurry A with a solid content of 30%;

[0069] (2) Take 100 parts by mass of slurry A, add grinding media, place it in a stirring wet mill and wet grind until the particle size is 15 μm, sieve and take out the grinding media, and obtain slurry B;

[0070] Adopt following wet grinding process parameter in the step (2):

[0071] The grinding medium is zirconia grinding balls with a particle size of 0.5-3.0mm, the filling rate of the grinding medium is 65% by volume, the weight ratio of the ball to material is 1:3, and the stirring shaft speed of the wet mill is 350r / min. The grinding time is 30min.

[0072] (3) Put...

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Abstract

The invention provides a method for removing carbon from gasification slag, which comprises the following steps of: 1, uniformly mixing the gasification slag and water to obtain slurry A with solid content of 10-70 wt%; 2, adding a grinding medium into the slurry A, putting the slurry A into a stirring wet mill, carrying out wet milling until the particle size of the gasified slag is less than or equal to 20 microns, screening, and taking out the grinding medium to obtain slurry B; 3, placing a metal container containing the slurry B in an electric field, so that components in the slurry B are rapidly layered; and 4, recovering upper-layer floating carbon particles from the metal container, and recovering middle-layer water to obtain lower-layer gasified slag subjected after wet grinding and carbon removal. The method disclosed by the invention is good in carbon removal effect, the treated gasification slag is high in purity and free of adhesion of other harmful chemicals, the carbon content is lower than 1%, and subsequent wide application of the gasification slag is facilitated.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource treatment in coal chemical industry, and in particular relates to a method for removing carbon from gasification slag. Background technique [0002] In recent years, the national coal chemical industry has continued to develop, and our country emits 360 million tons of gasification slag every year due to coal combustion. The construction of a large number of gasification slag yards occupies a large amount of land, causes environmental pollution, wastes resources, and brings greater economic pressure and environmental risks to the normal operation of enterprises. Gasification slag is highly corrosive and releases pungent gas, which will occupy a large amount of land when piled up or landfilled, and its leachate will also pollute soil and water. [0003] By studying the composition and chemical properties of the coal gasification slag, it is found that the gasification slag not only ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C7/00
CPCB03C7/003B03C7/00
Inventor 贺行洋马庆红苏英赵浩祥杨明鉴付健健王传辉陈顺郑正旗
Owner HUBEI UNIV OF TECH
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