Preparation method for molded biomass active carbon with crop straw as raw material

Abstract

The invention provides a preparation method for molded biomass active carbon with crop straw as a raw material. The method comprises the following steps: (1) rinsing: a step of rinsing crop straw with water so as to remove adhered substances; (2) drying; (3) crushing; (4) sieving; (5) charring: a step of subjecting straw powder to anoxic charring at a temperature of 700 DGE C for 8 h; (6) activation: a step of carrying out activation by using phosphoric acid; (7) washing; (8) drying; (9) sieving; (10) molding: a step of mixing biomass active carbon with an aqueous solution of carboxymethylcellulose sodium (CMC) and compacting the obtained mixture at normal temperature and under certain pressure so as to obtain a cylindrical molded block with a diameter of 1 cm and height of 2 cm; and (11) heat treatment. The method provided by the invention overcomes the problems of resource waste, sever environmental pollution, destroy of a farmland soil structure and great threat to industrial and agricultural production and traffic safety caused by piling or on-site burning of crop straw in the countryside; the molded biomass active carbon is prepared from crop straw and extensively used in industries like gas transport carriers, environment adsorption material, natural gas adsorption and storage materials, hydrogen storage materials, refrigeration adsorbents, catalyst carriers, electrode materials, etc., so resource utilization of crop straw is realized.

Description

technical field [0001] The invention relates to a processing technology for resourceful treatment of crop straws, in particular to a method for preparing shaped biomass activated carbon by using crop straws as raw materials. Background technique [0002] As a large agricultural country, my country has a total annual output of 700 million tons of crop straws; however, due to the lack of efficient utilization methods, a large amount of crop straws are discarded or burned on the spot, and only 30% of them are actually used as resources. Waste, and seriously pollute the environment, destroy the soil structure of farmland, and pose a great threat to industrial and agricultural production and traffic safety. Recent studies have shown that activated carbon prepared from biomass waste has superior adsorption properties. Therefore, as a new way of resource utilization of crops, the carbonization technology of using crop wastes to prepare biomass activated carbon materials has receive...

AI Technical Summary

Problems solved by technology

However, the activated carbon produced by the general carbonization method is powdered activated carbon, which causes great inconvenience for transportation and use, especially in the separation process after water treatment; and it is extremely easy to cause dust pollution

Images