Active carbon and preparing method thereof

Abstract

The invention relates to active carbon and a preparation method of the active carbon. The active carbon comprises carbon and silicon dioxide, and the natural stacking density of the active carbon is 0.1-0.3g / cubic centimeter. According to the preparation method of the active carbon, preheating, carbonizing and activating processes are continuously sequentially conducted in a same device, an external hot source is not needed, the control method is simple, and production cost is low. The active carbon prepared from the method is uniform in particle size and high in structural strength and adsorption capacity, an original semi-oval structure is maintained, multiple gaps are naturally formed when the active carbon is stacked, and adsorption resistance to fluid is reduced.

Description

technical field [0001] The invention relates to a solid adsorbent and a preparation method thereof, in particular to activated carbon and a preparation method thereof. Background technique [0002] Adsorption is a unit operation that uses the microporous characteristics of solid media to selectively adsorb components. It is a relatively mature separation and purification method and is widely used in chemical, environmental protection, pharmaceutical and military fields. Among many adsorbent materials, activated carbon is widely used because of its strong adsorption capacity and low cost. [0003] Activated carbon is a kind of porous carbon material, which has the advantages of large specific surface area, wide source of raw materials, high mechanical strength, easy regeneration and good stability. Activated carbon is usually obtained by carbonizing and activating raw materials under certain conditions. The main purpose of carbonization is to obtain a carbonized material wi...

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Problems solved by technology

The chemical activation method is to add chemicals to the raw materials, and then heat them in an inert gas medium to activate them; the most representative chemical activation methods are zinc chloride method, phosphate method, calcium chloride method and alkali method; but due to The use of chemicals will bring the following problems: highly corrosive to equipment; pollute the environment; chemicals remain in the activated carbon; a large amount of chemicals are consumed and the cost is high; an external heat source is required and the activation temperature is strictly controlled

Aiming at the problem of separating the activation and carbonization stages and requiring different equipment in the physical activation method, a patent document with the publication number CN1048203A discloses a method for producing activated carbon by using ebony seed husks, which performs the carbonization and activation stages simultaneously , and carried out in the same equipment; it uses the flammable gas produced in the activation for combustion to provide a heat source and also requires an external heat source. The temperature range for carbonization is 500°C-700°C and the temperature range for activation is 800°C- 900°C; because the flammable gas generated by itself is used to burn to provide heat during the preparation process, air needs to be introduced, which has certain safety hazards, and the temperature control method is complicated; the entire preparation cycle reaches 72-120 hours

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