Preparation method of activated carbon with low ash content and high specific surface area

Abstract

The invention relates to a preparation method of activated carbon with low ash content and high specific surface area. The preparation method comprises the following steps of: S1, selecting coal withash content lower than 8%, and grinding the coal to 200 meshes or below; S2, selecting shell carbonized materials, and crushing and grinding the shell carbonized materials into powder of 200 meshes orbelow; S3, premixing the coal and the shell carbonized materials in the steps S1 and S2 with an adhesive according to a mass ratio of 100: (10-100): (20-60) to form a premix; S4, uniformly mixing andkneading the premix under the condition of 45-120 DEG C, carrying out extrusion molding under the condition of 10-20MPa to form strips with the diameter of 4-12 mm, and airing the material strips; S5, carbonizing the aired material in a carbonizing furnace at the carbonizing temperature of 250-500 DEG C for 0.5-5 hours; and S6, activating the strongly carbonized material for 0.5-5 hours by utilizing water vapor at 800-1100 DEG C to obtain the activated carbon with low ash content and high specific surface area. The activated carbon prepared by the preparation method of activated carbon with low ash content and high specific surface area has the characteristics of low cost, high strength, low gray scale and high specific surface area.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, in particular to a method for preparing activated carbon with low ash and high specific surface area. Background technique [0002] Usually activated carbon is prepared from carbon-containing raw materials such as wood, coal and petroleum coke through pyrolysis and activation processing. Performance, widely used in water treatment, flue gas absorption, desulfurization and denitrification, catalyst carrier, solvent recovery and energy storage and other technical fields. [0003] Activated carbon prepared from wood such as fruit shells and sawdust has the advantages of low ash content, large specific surface area, and good adsorption performance, but it has the advantages of low packing density, high cost, and low strength. Coal-based activated carbon has the advantages of easy availability of raw materials, low cost, high strength, and high packing density, but has disadvanta...

AI Technical Summary

Problems solved by technology

[0003] Activated carbon prepared from wood such as fruit shells and sawdust has the advantages of low ash content, large specific surface area, and good adsorption performance, but it has certain disadvantages such as low packing density, high cost, and low strength.

Coal-based activated carbon has the advantages of easy availability of raw materials, low cost, high strength, and high packing density, but has disadvantages such as low specific surface area and high ash content. The ash content is generally 10%-25%. To reduce the ash level, acid-base chemistry is usually used. This method consumes a lot of acid and alkali, causing a lot of pollution, and at the same time increases the cost of activated carbon preparation and reduces the strength of activated carbon

Therefore, none of the above methods can obtain activated carbon with low cost, high strength, low ash content and high specific surface area.