Preparation method of active carbon

Abstract

The invention relates to a method used for preparing active carbon from expired carbon molecular sieve. The method comprises following steps: firstly, a certain amount of expired carbon molecular sieve is delivered into a converter; the temperature of the expired carbon molecular sieve is increased to be 200 DEG C at a heating rate of 10 DEG C / min, wherein the rotating speed of a furnace pipe is set to be 8r / min; the temperature is maintained to be 200 DEG C for 30min, and then is increased to 450 DEG C at a heating rate of 5 DEG C / min, wherein the rotating speed of the furnace pipe is set to be 10r / min; the temperature is maintained to be 450 DEG C for 30min; purified water is introduced into the converter dropwise at a speed of 30 drops per min (about 0.05g / drop) when the temperature is maintained to be 450 DEG C for 5 to 10min; natural cooling is carried out; the rotating speed of the furnace pipe is adjusted to 5r / min; and sieving is carried out when the temperature is reduced to be lower than 50 DEG C so as to obtain a qualified active carbon product. The preparation method is simple; cost is low; wastes are changed into valuables with high efficiency; energy consumption is reduced; no pollution is caused; and the economic benefit and social benefit are obvious.

Description

technical field [0001] The invention relates to a method for preparing activated carbon by utilizing invalid carbon molecular sieves, belonging to the field of waste utilization Background technique [0002] Activated carbon is a black porous carbon material that has been activated by high-temperature carbonization, and requires a large specific surface area and rich pore size. Due to its stable performance and strong adsorption capacity, it can be widely used in chemical food, decoration, air purification, coal mines and other fields. [0003] At present, the methods of preparing activated carbon mostly use raw materials such as fruit shells, wood, and coal, and are prepared through ultra-fine grinding, chemical reagent treatment, and high-temperature carbonization above 800 degrees. For example, Chinese Patent Publication No. CN105923631A discloses a method for preparing activated carbon. The steps include: crushing walnut shells, reacting with sodium carbonate solution a...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of heavy pollution, high cost and complicated process in the activated carbon industry, the present invention creatively adopts the failed carbon molecular sieve, and recreates the micropores of the failed carbon molecular sieve by low-temperature steam to prepare high-performance activated carbon with abundant micropores and super large specific surface area