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A kind of preparation method of coal-based activated carbon based on external heat rotary furnace carbonization

An external heating rotary furnace, coal-based activated carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of difficult moisture control, difficult pulverization, too fine internal pores, etc., to avoid drying and drying. Drying process, improve production efficiency, low bonding index effect

Active Publication Date: 2019-01-11
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, the conversation process of traditional coal-based activated carbon cannot fully meet the requirements

Method used

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  • A kind of preparation method of coal-based activated carbon based on external heat rotary furnace carbonization
  • A kind of preparation method of coal-based activated carbon based on external heat rotary furnace carbonization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1), Xinjiang Hami coal is pulverized into 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 %;

[0058] (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;

[0059](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%;

[0060] (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).

[0061] Detect briquette strength, drum strength (GB / T 7702.3-2008) 89.2%.

Embodiment 2

[0063] 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.

[0064] Detect briquette strength, drum strength (GB / T 7702.3-2008) 91.4%.

Embodiment 3

[0066] (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%;

[0067] (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.

[0068] (3) Carry out degassing treatment to the material in the feed bin, keep the negative pressure in the feed bin at 2.5kPa~3kPa;

[0069] (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 coal-based activated carbon preparation method based on external heating type rotary furnace carbonization. The method comprises the steps that feed coal is subjected to briquetting and pelletizing, oxidation treatment, carbonization treatment and activation treatment are conducted in sequence, and activated carbon is obtained; carbonization treatment is conducted by means of an external heating type rotary furnace. Due to the fact that segmented heating can be achieved through the external heating type rotary furnace, accurate control over temperatures of materials at various sections of the external heating type rotary furnace is benefited; due to the fact that the carbonization temperature has an important influence on carbonized product quality, the external heating type rotary furnace can effectively ensure the stable quality of carbonized products and increase the mass of volatile gas of the carbonized products; meanwhile, a material lifting plate adopts design of segmented bending, when the materials lifted by the material lifting plate fall, the materials can be gradually scattered by a certain oblique angle through an oblique second section, a continuous material curtain is formed, compared with a traditional straight panel type material lifting plate, powder produced due to the fact that the materials are broken can be effectively reduced, and the quality of the carbonized products and activated carbon can be improved.

Description

technical field [0001] The invention belongs to the field of activated carbon production and processing, in particular to a method for preparing coal-based activated carbon based on carbonization in an externally heated rotary 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] The main process of coal-based activated carbon preparation includes pre-oxidation, carbonization and activation of coal shaped pellets. It is believed that carbonization is a key link in the production of high-quality activated carbon. At this stage, the reaction material mainly undergoes coal pyrolysis r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/336C01B32/39C01B32/318
Inventor 陆晓东王洪强韩晓林赵龙冀占成常博张雁江鲁宗虎赵荣善
Owner CHNA ENERGY INVESTMENT CORP LTD