Method for preparing coal-based porous activated carbon material by using cyanamide waste residues as template

Abstract

The invention relates to the field of preparation of porous carbon materials by a rigid template method, and particularly discloses a method for preparing coal-based porous activated carbon material by using cyanamide waste residues as a template. The method comprises the following steps of crushing the crude coal, grinding into the crude coal particles with granularity of 60 to 200 meshes, addingthe cyanamide waste residues, an adhesive and water, and uniformly mixing; compressing and forming the reaction material, ventilating air, airing, and carbonizing; conveying the carbonized material into an activating furnace, leading activating gas, and activating; finally, sequentially performing pickling treatment and water washing treatment on the crude product of the activated carbon, and drying, so as to obtain the coal-based porous activated carbon material. The method has the advantages that the method is simple, and the operation is easy; the treatment cost of highly-hazardous wastes,such as cyanamide industrial waste residues, can be greatly reduced, the resources can be recycled, and the nitrogen-modified coal-based activated carbon with high added value can be obtained in onestep; the recycled carbon material can be used as an adsorbent or a catalyst carrier, so that the added value of the coal-based activated carbon is greatly increased.

Description

technical field [0001] The invention relates to the field of preparing porous carbon materials by a hard template method, in particular to a method for preparing coal-based multi-level porous activated carbon materials by using cyanamide waste residue as a template. Background technique [0002] As a material with high specific surface area and developed pores, porous carbon material has the advantages of acid and alkali corrosion resistance and low price, and is widely used in adsorption, decolorization, refining, separation, catalysis and other fields. At present, the raw materials of industrial porous carbon materials mainly come from carbon-containing organic substances such as coal and biomass, of which coal-based activated carbon accounts for about 60%, but the pore structure of carbon materials prepared from coal is usually microporous carbon with a pore size less than 2nm. There are certain limitations in the use of materials, therefore, the preparation of coal-based...

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Problems solved by technology

[0005] Because cyanamide waste residue is an industrial waste residue that is difficult to handle and has almost no use value, most domestic manufacturers pile up or landfill cyanamide waste residue on the spot, which not only takes up valuable land resources, but also causes damage to air, surface water and groundwater. severe pollution

Since the cyanamide waste residue and leachate are strongly alkaline, the accumulation and seepage will cause salinization of the land and pollute the groundwater. At the same time, the dust of the alkaline slag will pollute the surrounding environment and endanger the life and health of residents. Therefore, how to effectively use this Waste of resources has become a major problem facing green China

[0006] So far, there is no effective utilization method of cyanamide waste residue. In addition, there are still some technical problems in the large-scale industrial production of nitrogen-doped porous carbon materials. The pore-forming method of nitrogen-doped porous carbon materials usually has hard template method , soft template method, activation method and other methods, among which the hard template method and the soft template method often require expensive templating agents and require a certain post-treatment process, which is difficult to be used in large-scale industrial production; the activation method is currently a commonly used pore-forming method in industry The method also has the problem that the pore structure is difficult to control.

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