Method for co-producing mesopore-developed activated carbon and high-modulus silicate by using rice husks

Abstract

The invention provides a method for co-producing mesopore-developed activated carbon and high-modulus silicate by using rice husks, and belongs to the technical field of activated carbon production, the method comprises the following steps: respectively carbonizing and activating the rice husks in two sections in a carbon activation integrated furnace, wherein a carbon section and an activation section are in a reducing gas atmosphere, and meanwhile, steam is introduced into the activation section; activating to obtain a rice hull activated material with high carbon content and high-activity silicon dioxide, extracting active silicon dioxide from the rice hull activated material at normal pressure in a gradient manner, and reacting gradient silicate with quartz sand wet-process silicate and solid silicate to prepare a silicate solution with high modulus and high concentration, so that the evaporation and concentration cost is reduced, and the silicon dioxide extraction rate is up to more than 95%. The the mesopore-developed activated carbon is obtained from rice husk activated material by washing, pickling purification, filtration, drying, crushing, uniform mixing, iron removal and packaging. The method is high in production efficiency, good in product quality, small in environmental pollution, low in production cost and suitable for industrial production, and has good industrial popularization significance.

Description

technical field [0001] The invention belongs to the technical field of activated carbon production, and in particular relates to a method for co-producing activated carbon with well-developed mesopores and high modulus silicate by using rice husks. Background technique [0002] The information disclosed in this Background section is only intended to increase the understanding of the general background of the disclosure, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is already known to those skilled in the art. [0003] my country is a big rice country, with an annual rice output of more than 200 million tons, accounting for about one-third of the global annual output, ranking first in the world, and rich in rice husk resources. The chemical composition of the dry basis of rice husk is about 80% organic matter and 20% ash. The organic matter is mainly cellulose, lignin, hemicellulose and other...

AI Technical Summary

Problems solved by technology

Conventional rice husk activated carbon is first pyrolyzed and carbonized, then silica is extracted, and finally steam, CO 2 Or chemical agents are activated, the production process is cumbersome, the energy consumption is high, the amount of agents is large, and the amount of waste liquid is large

The quality of the existing rice husk co-production activated carbon or silicate product is uncontrollable, the consumption of liquid alkali is large, the dissolution rate of silica is low, the concentration and modulus of silicate are difficult to increase, the adsorption capacity of activated carbon is low, and the pore structure is underdeveloped

Images