Simple method for synchronous preparation of water glass and activated carbon with rice husk pyrolyzed ash

Abstract

The invention relates to a simple method for synchronous preparation of water glass and activated carbon with rice husk pyrolyzed ash, and especially relates to a simple method, which takes rice husks as raw materials that are first pyrolyzed so as to obtain pyrolyzed ash with a high C / SiO2 ratio, and then performs synchronous preparation of activated carbon during increasing the modulus of a water glass product. In the method, the main raw material sodium hydroxide is employed for hydrolysis of the pyrolyzed ash under heating and pressurization conditions so as to obtain a high modulus water glass solution, and simultaneously the surface of carbon is activated so as to obtain activated carbon. The pyrolysis method adopted in the invention ensures no secondary pyrolysis in pyrolysis, and also ensures that the volatile matter of the pyrolyzed ash can be fully pyrolyzed and contains no tar component, thus ensuring the whiteness of a silica product prepared in subsequent operations. Compared with other pyrolysis methods, the C / SiO2 ratio obtained in the invention is high, and is beneficial to improve the yield of activated carbon. Also, the produced water glass product has controllable modulus, and the produced activated carbon has good application performance. With simple process and low energy consumption, the method of the invention is easy to realize easy industrialized production and has broad application prospects.

Description

technical field [0001] The invention relates to a simple method for synchronously preparing water glass and activated carbon from pyrolysis ash of rice husk, in particular to using rice husk as raw material and firstly obtaining high C / SiO by pyrolysis 2 A simple method for synchronously preparing activated carbon during the process of increasing the modulus of water glass products. Background technique [0002] The use of biomass resources to produce chemical products is an important way to solve the shortage of fossil resources. Among them, the research and application of comprehensive utilization of rice husk resources has attracted the close attention of scientists and entrepreneurs at home and abroad, and a large number of patent documents have been reported. [0003] Yuan Fulong from the Department of Chemistry of Heilongjiang University changed the process, adopted the cyclic alkali leaching method to improve the modulus of water glass, and co-produced better activate...

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Problems solved by technology

[0004] Among the above patents, some patents use the silicon source in rice husk ash to prepare water glass and silicon dioxide separately, and some patents use the carbon source in rice husk ash to prepare activated carbon separately, which does not make full use of rice husk ash; some patents use one-step Alkaline leaching of rice husk ash method to prepare water glass, co-production of white carbon black and activated carbon, the method is simple, the silica leaching rate is high, the existing problems are: (1) the modulus of water glass products is low, and the scope of application is limited Limitation; (2) The carbon obtained needs to be activated twice to obtain activated carbon products, which consumes a lot of energy and costs high; although some patents have prepared water glass and activated carbon at the same time, high modulus water glass is not a one-step process for repeated extraction. Obtained, relatively complicated process