Process for preparing high-specific surface area composite pore structure coal-based activated carbon by using low dosage of KOH

Abstract

The invention discloses a process for preparing high-specific surface area composite pore structure coal-based activated carbon by using coal. The process comprises steps of firstly, crushing the coal into 100 meshes per square inch to 200 meshes per square inch, then mixing coal powder and an alkali activator uniformly by grinding in inert atmosphere, performing multi-stage temperature controlling activation, washing and drying to obtain the high-ratio surface area activated carbon with a micro pore-meso pore composite pore structure. The prepared high-ratio surface area activated carbon is low in non carbon impurity content, high in specific surface area and good in adsorption performance and has the micro pore-meso pore composite pore structure. Compared with the prior art, consumption of the alkali activator is reduced greatly, therefore, the product has high cost performance.

Description

technical field [0001] The invention belongs to a method for preparing activated carbon with high-efficiency adsorbent, in particular to a method for preparing activated carbon with high specific surface area composite pore structure from coal. Background technique [0002] Activated carbon is a carbon material with a rich pore structure, which has the advantages of large specific surface area, abundant raw materials, and low price. In the development and application of activated carbon, a variety of activators have been used in the production of activated carbon, and the activators used in large-scale industrial production are mainly ZnCl 2 、H 3 PO 4 , water vapor, CO 2 , air, etc. [0003] At present, the commonly used raw materials for the production of activated carbon are wood, fruit shells, petroleum coke and coal. Because coal is relatively cheap and easy to obtain, coal-based activated carbon accounts for the majority of activated carbon production in activated ...

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Problems solved by technology

The problem that this method exists is that the price of petroleum coke is relatively high, and the large-scale use of KOH in the production process makes production cost rise, and can cause serious corrosion to production equipment simultaneously, also can make the water consumption during washing sharply increase, and The unique pore structure of the resulting product limits its application in some fields

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