Multistage-rake-furnace-based activation method of coal-base activated carbon

A technology of coal-based activated carbon and activation method, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problem of gas diffusion affecting carbonization volatiles escape and activation, coal-based granular activated carbon can not fully meet the requirements, moisture control Difficulty and other problems, to avoid the drying and drying process, low adhesion index, and improve production efficiency

Active Publication Date: 2016-06-22
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the smaller the pulverized coal particle size, the greater the possibility of its agglomeration. Considering the need for water in the subsequent compression molding, it is difficult to control the water content, and it is also difficult to crush. The requirements for equipment are high, and it is difficult to popularize and utilize.
At the same time, the study found that the particle size of coal powder is too fine, which will easily lead to too fine internal pores after the briquette is formed, which will affect the escape of subsequent carbonization volatiles and the diffusion of activation gas to the internal pores during the preparation of activated carbon.
[0006] In this way, coal-based granular activated carbon prepared by traditional methods cannot fully meet the requirements

Method used

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  • Multistage-rake-furnace-based activation method of coal-base activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1), Xinjiang Hami coal is pulverized to coal powder with an average particle size of 29 μm, and sieved, wherein the content of coal powder with a particle size greater than 80 μm is 2.5 wt %; the content of coal powder with a particle size greater than 40 μm is 28 wt %;

[0048] (2), send the pulverized coal obtained in (1) into the feed bin of the briquette forming equipment, and carry out degassing treatment to the material in the feed bin, keep the negative pressure in the feed bin At 2.5kPa~3kPa;

[0049] (3) Keep the temperature of the material in the feeding bin at 50°C to 55°C, and adjust the moisture content to 7wt to 8wt%;

[0050] (4), the material in the feeding bin is sent into the molding equipment through the screw forced feeder for molding, and the linear pressure between the rollers is about 11-12t / cm during molding, so as to obtain the molding briquette (type coal).

[0051] Detect briquette strength, drum strength (GB / T7702.3-2008) 89.2%.

Embodiment 2

[0053] The difference from Example 1 is that the raw coal is a mixture of Xinjiang Hami coal and Heishan mining area longbituminous coal in a mass ratio of 1:1.

[0054] Detect the strength of the briquette, and the strength of the drum (GB / T7702.3-2008) is 91.4%.

Embodiment 3

[0056] (1) Mix Xinjiang Hami coal and Heishan mining area longbituminous coal uniformly at a mass ratio of 1:1, and crush to coal powder with an average particle size of 35 μm, and then sieve, wherein the content of coal powder with a particle size greater than 80 μm is 8.2 wt%; the content of pulverized coal with a particle size greater than 40 μm is 22wt%;

[0057] (2) Send the pulverized coal obtained in (1) into the mixing chamber for stirring and degassing. The top of the mixing chamber is equipped with an air extraction pipeline to make the density of the pulverized coal after stirring reach 0.60-0.65kg / L, and then pass through the star valve The pulverized coal in the mixing bin is sent to the feeding bin of the briquetting equipment.

[0058] (3) Carry out degassing treatment to the material in the feed bin, keep the negative pressure in the feed bin at 2.5kPa~3kPa;

[0059] (4), keeping the temperature of the material in the feeding bin at 80°C to 85°C, and adjusting...

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Abstract

The invention discloses a multistage-rake-furnace-based activation method of coal-base activated carbon. The multistage rake furnace is utilized to perform activating treatment on a carbonization material. The activation furnace comprises a heating section, an activation section and a cooling section, wherein each of the activation section and cooling section is respectively provided with an air inlet and a water vapor inlet. In the activation process, the air and water vapor inputs are regulated to regulate the temperatures of all the layers of the activation section and cooling section. Only the air and water vapor are introduced to activate the carbonization material in the activation section and cooling section of the rake activation furnace; and the exothermic reaction in the activation process is utilized to provide heat for the activation process. Compared with the prior art, the heat supply to the activation reaction is not needed through the hot smoke after combustion in the activation section and/or cooling section, thereby effectively enhancing the effective concentration of the activator in the activation section. By using the alternate oxidation-reduction reactions, the material can be better activated.

Description

technical field [0001] The invention belongs to the field of coal-based activated carbon preparation, and in particular relates to a method for activating coal-based activated carbon based on a multi-stage rake furnace. Background technique [0002] Because activated carbon has a highly developed pore structure and a large specific surface area, its applications range from decolorization and deodorization of food and medicine, gas masks, to large-scale use in solvent refining and recovery, advanced water treatment, flue gas Purification, blood purification, etc., also put forward new and higher requirements for the performance of activated carbon. [0003] In addition, although powdered activated carbon has relatively developed micropores and mesopores, its application fields are limited due to its powdery form. In the production of activated carbon, the method of preparing coal-based activated carbon with coal as raw material has been widely used. However, most coal powder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B32/336
CPCC01P2006/12
Inventor 冀占成罗富韩晓林赵龙王洪强陆晓东崔仕国舒晓亮
Owner CHNA ENERGY INVESTMENT CORP LTD
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