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Preparation method for coal-based activated carbon by carrying out combined gas activation by stages

A coal-based activated carbon, staged technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of micropore damage and surface carbon loss, and achieve the effect of improving pore-forming efficiency

Active Publication Date: 2014-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims to solve the problem of the contradiction between gas intramolecular diffusion and chemical reaction in the current preparation of coal-based activated carbon during the activation process, resulting in micropore damage and high surface carbon loss, and provides a coal-based activated carbon preparation method for gas combination activation in stages

Method used

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  • Preparation method for coal-based activated carbon by carrying out combined gas activation by stages
  • Preparation method for coal-based activated carbon by carrying out combined gas activation by stages
  • Preparation method for coal-based activated carbon by carrying out combined gas activation by stages

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specific Embodiment approach 1

[0029] Specific implementation mode 1: The coal-based activated carbon preparation method of gas combination activation in stages in this implementation mode is specifically carried out according to the following steps:

[0030] 1. Crush and sieve the weakly cohesive coal to obtain coal particles with a particle size of 3mm to 5mm;

[0031] 2. Under the condition of isolated air, control the temperature rise rate of 8°C / min to 15°C / min, raise the temperature to 440°C to 550°C, and keep it for 1h to 3h for early medium temperature carbonization treatment to obtain carbonized material ;

[0032] 3. Naturally cool the carbonized material obtained in step 2 to 200°C-320°C, and keep it for 6h-10h under the condition of air circulation for air oxidation treatment;

[0033] 4. The carbonized material after the air oxidation treatment in step 3, under the condition of isolated air, control the heating rate at 20°C / min-30°C / min, raise the temperature to 650°C-850°C, and keep it for 0....

specific Embodiment approach 2

[0036] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 2, the heating rate is 10° C. / min, and the temperature is raised to 450° C. and kept for 2 hours. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037] Embodiment 3: This embodiment is different from Embodiment 1 in that: in step 3, cool to 280° C. and keep for 8 hours. Others are the same as in the first embodiment.

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Abstract

The invention discloses a preparation method for coal-based activated carbon by carrying out combined gas activation by stages, and relates to the preparation method for the coal-based activated carbon. The preparation method is used for solving the problem that microporous damages are caused and the surface carbon loss is high due to contradiction of diffusion and chemical reaction in gas molecules during an activating process in preparation of the coal-based activated carbon at present. The preparation method comprises the following steps: I, crushing weak caking coals and screening the crushed weak caking coals to obtain coal granules; II, carrying out earlier-stage middle-temperature carbonizing treatment; III, carrying out air oxidization treatment; IV, carrying out high-temperature carbonizing treatment; V, activating vapor; and VI, activating CO2. According to the preparation method, by controlling the carbonizing temperature and the carbonizing atmosphere, consumption and transformation of irregular carbon and crystalline carbon in the weak caking coals are regulated to control the order degree of the carbon structure in the carbonized materials; gas activation is carried out by stages by utilizing the reaction characteristics of the vapor, the CO2 and the carbon structure, so that the activated carbon with developed micropores and through mesopores is finally obtained, and the pore-forming efficiency is improved. The preparation method is used for preparing the coal-based activated carbon.

Description

technical field [0001] The invention relates to a method for preparing coal-based activated carbon. Background technique [0002] As a high-performance adsorption material, activated carbon material is widely used in energy, environmental protection, chemical industry and other fields. Activated carbon for gas phase adsorption should have an extremely developed microporous structure to strengthen the adsorption of gas molecules; a well-connected mesopore structure is conducive to the diffusion and transportation of gases, so the simultaneous realization of these two pore structures is an advancement in the preparation of activated carbon. key. The preparation of activated carbon from coal has the advantages of wide source of raw materials, many types, and low price, and the degree of deterioration of coal is different, and the molecular structure is significantly different, so it can be oriented to prepare activated carbon with specific pore structure. The basic structural...

Claims

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Application Information

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IPC IPC(8): C01B31/10C01B32/336
Inventor 高继慧朱玉雯孙飞刘冬冬吴少华秦裕琨
Owner HARBIN INST OF TECH
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