Particle size gradation coal blending method capable of improving strength of briquetted activated carbon

Abstract

The invention discloses a particle size gradation coal blending method capable of improving the strength of briquetted activated carbon. The particle size gradation coal blending method comprises the following steps: (1) grinding: respectively grinding non-caking coal and highly caking coal, wherein the particle size of the non-caking coal after grinding is 300-400 meshes, and the particle size of the highly caking coal is 300-800 meshes; (2) weighing and proportioning: adding 5%-30% by weight fraction of the highly caking coal after grinding into the non-caking coal after grinding, and stirring till uniform mixing; (3) briquetting and forming: sending coal powder after mixing into a forming device for briquetting; (4) carbonizing: putting coal briquettes after briquetting and forming into a rotary furnace for carbonization; (5) activating: activating the coal briquettes after carbonization in an activating furnace till the loss on ignition achieves 45%-55% to obtain a briquetted activated carbon finished product. According to the particle size gradation coal blending method disclosed by the invention, by controlling the particle size gradation of the non-caking coal and the highly caking coal, the strength of the briquetted activated carbon finished product can be significantly improved. The particle size gradation coal blending method has the advantages of low cost and easiness in implementation.

Description

technical field [0001] The invention relates to a coal blending method, in particular to a particle graded coal blending method for increasing the strength of briquetted activated carbon, and belongs to the technical field of coal chemical industry. Background technique [0002] Activated carbon is a hydrophobic adsorbent made from carbon-containing substances as raw materials, which is carbonized and activated at high temperature. Activated carbon contains a large number of micropores, has a huge specific surface area, can effectively remove color, odor, and remove organic pollutants and some inorganic substances in water bodies. It is widely used in environmental protection, chemical industry and other fields. Therefore, its The demand is increasing year by year. my country has abundant coal reserves, which can be effectively used to prepare coal-based activated carbon. According to different raw materials, coal-based activated carbon is divided into crushed activated ca...

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Problems solved by technology

[0003] Strength is an important indicator of the performance of briquetted activated carbon. The weak caking coal in Datong, Shanxi has proper cohesiveness, and the briquetted activated carbon whose adsorption index meets the requirements can be prepared, and the strength is above 90, but the reserves of this weakly caking coal are very limited. ; and Xinjiang, Shaanxi Shenfu and other places have relatively large reserves of non-stick coal, but the degree of coalification is low, and the strength of the finished briquetted activated carbon produced is poor, which is difficult to meet market demand

At present, the strength of the briquetted activated carbon prepared by non-caking coal is mainly improved by adding coal tar pitch, but the price of coal tar pitch is high, and it is difficult to disperse in non-stick coal, the actual application effect is not ideal, and the strength of the finished product is not ideal still lower

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