Method for synthesizing Na-X and hydroxysodalite form coal ash filter cake by adopting dry method

Abstract

The invention discloses a method for synthesizing Na-X and hydroxysodalite from a coal ash filter cake by adopting a dry method. The method comprises the steps of preparing a coal ash clinker melt by ash alkaline, then adding water to enable solvends of the coal ash clinker melt by the ash alkaline to be dissolved, adjusting the pH value of the filter cake, and synthesizing zeolite by adopting the dry method. The research shows that different types of zeolite can be prepared by adjusting the pH value of the filter cake and controlling the synthesis time. Two types of zerolite can be synthesized by adopting the method, namely the Na-X and the hydroxysodalite. According to the method, waste coal ash is used, and the zerolite can be synthesized without adding any chemical reagent; the recycling application of the coal ash is realized; the method is a novel method conforming to the green production.

Description

technical field [0001] The invention belongs to the technical field of research on synthesizing zeolite molecular sieves from fly ash, and in particular relates to a method for synthesizing Na-X and hydroxy sodalite by using a fly ash filter cake method. Background technique [0002] The mineral composition of fly ash is mainly quartz, mullite, glass body and a small amount of carbon, magnetite, etc., and the main chemical composition is SiO 2 、Al 2 o 3 , the content of both is more than 70%. In view of the similarity between the composition of fly ash and the volcanic ash that forms natural zeolite, in 1985, and Wirsching [1] took the lead in carrying out the research on the synthesis of zeolite molecular sieve by using fly ash, which pointed out a feasible way for the comprehensive utilization of fly ash and the search for new raw materials for synthesizing zeolite molecular sieve. Coal ash and different types of zeolite molecular sieves were synthesized by different ...

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Problems solved by technology

These methods require a large amount of water as a solvent, the process is complicated and the environment is polluted.

Then came the steam method (Chinese patent, patent number: ZL200910021112.4, Zhao Yajuan, Zhao Xicheng, Jiang Yuanru, the method of preparing zeolite molecular sieves from fly ash by alkali fusion-steam method [P]. Public date July 15, 2009 Japan), the method of synthesizing fly ash into zeolite with trace water, etc. Although the synthesis process of this method requires less water, the process is simple, and the pollution is small, the type of synthetic zeolite is single

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