Novel process for co-production of high-quality rice husk-based activated carbon and wet-process sodium silicate

Abstract

The invention provides a novel process for co-production of high-quality rice husk-based activated carbon and wet-process sodium silicate. The method is characterized in that reducing gas is adopted to carry out carbonization and activation heat supply on rice husks, water vapor for activation reacts with a carbonized material after being heated at a high temperature, heat absorption consumption of the activation reaction is balanced through heat of the water vapor, and activation can be maintained at the temperature of lower lattice rate of silicon dioxide. According to the method, the lattice conversion rate of silicon dioxide in the material can be reduced, the rice hull activated material with high carbon content is obtained, and polymerization of silicon dioxide is hindered by the carbon content; the silicon dioxide in the activated material is easy to extract, the activated material can be used for preparing the high-modulus sodium silicate through low-temperature normal-pressure gradient extraction, and the total dissolution rate of the silicon dioxide can reach 95% or above; by combining with a quartz sand wet-process sodium silicate process, the problem of low wet-process modulus is solved; and the invention relates to a novel process for simultaneously preparing high-quality activated carbon from rice husks and extracting high-modulus sodium silicate by a wet method.

Description

【Technical field】

[0001] The invention belongs to the technical field of comprehensive utilization of rice husks, and in particular relates to a new process for the joint production of high-quality rice husk-based activated carbon and wet-process sodium silicate. 【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 rice processing produces about 20% rice husk by weight, and rice husk resources are abundant. The chemical composition of the dry basis of rice husk is about 80% organic matter a...

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