Method for preparing activated carbon with large specific surface area through rapid activation

Abstract

The invention relates to a method for preparing activated carbon with a large specific surface area through rapid activation. The activated carbon with a large specific surface area is prepared through rapidly activating high-carbon raw materials, such as anthracite, petroleum coke and the like, by auxiliaries and alkali together. The method comprises the steps of uniformly mixing the high-carbon raw materials, the activating auxiliaries and KOH, so as to obtain an alkali-carbon mixture, and heating the alkali-carbon mixture under the protection of an inert atmosphere, so as to obtain an activation product; quickly cooling the activation product to room temperature under the protection of the inert atmosphere; washing the activation product with water, and drying, thereby preparing the activated carbon with a large specific surface area. According to the method, the activation temperature is low, the activation time is short, a relatively high yield of activated carbon with a large specific surface area is obtained under the condition of a lower alkali / carbon ratio, the utilization ratio of alkali, carbon and energy is increased, the production cost is reduced, and the pollution is reduced.

Description

technical field [0001] The invention relates to a method for rapidly activating and preparing activated carbon with high specific surface area. The method uses high-carbon raw materials such as anthracite and petroleum coke to be rapidly activated by additives and alkali. Background technique [0002] Activated carbon is an adsorbent with excellent performance, which is widely used in various industries because of its dual characteristics of physical adsorption and chemical adsorption. my country is the largest producer of activated carbon in the world. The output of activated carbon accounts for one-third of the world's output. However, the activated carbon it produces is mainly medium and low-grade products, and the overall product added value is not high. The expansion of the application field of activated carbon puts forward new and higher requirements for the adsorption performance. Under the general requirements of "high adsorption, multi-function and high strength...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned patent method has the following disadvantages in the production process: (1) The activation yield is low, the carbon consumption is large, and the production cost is high; (2) The activation temperature is high, the activation time is long, the energy consumption is large, and the production cost is high ; (3) The alkali carbon used is relatively high, so the production cost is high and the pollution is serious