Method for preparing active carbon from agricultural-forestry residues Chinese chestnut thorn shells

Abstract

A method for preparing activated carbon by utilizing agricultural and forestry waste chestnut thorn shells, the method comprising the following steps: sending the air-dried chestnut thorn shells to a chopping device, and the crushed materials are transported to a silo through a belt conveyor; controlling the feeding speed so that The crushed materials are extruded into blocks and then sent to the carbonization furnace silo; the formed block materials enter the carbonization furnace intermittently, and then add acid source, gas source and inorganic silicon and carbonize at 320-350 °C for 5-8 hours to form carbon blocks; After cooling to normal temperature, it is transported to the crusher for crushing and screening into unshaped particles; the unshaped particles are lifted to the silo of the activation furnace, and transported to the physical method activation converter through a screw conveyor, and activated with water at a temperature of 700-850 ° C to become crude activated carbon; Transport the crude activated carbon to the pickling device for pickling; then wash the activated carbon to neutral through the water washing device; transport the wet activated carbon washed to neutral to the drying device, add nano-zinc oxide to the dried activated carbon, and mix well Activated carbon is obtained, and the activated carbon has high adsorption efficiency.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing activated carbon by utilizing agricultural and forestry waste chestnut thorn shells. Background technique [0002] 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 with initial pores suitable for activation and a certain mechanical strength. The essence of carbonization is that the organic matter in the raw material undergoes pyrolysis reactions, including thermal decomposition reactions and polycondensation reactions. The main purpose of activation is to prepare activated carbon with high specific surface area; activatio...

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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

[0004] my country is a big producer of chestnuts, and the by-products of the chestnuts produced are chestnut thorn shells (those with thorns on the outside of chestnuts), which are not widely used at present, and are mainly piled up as garbage, which seriously affects environmental sanitation

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