Method for preparing molecular sieve based on red mud-biomass ash-fly ash doping tempering

Abstract

The invention relates to a method for preparing a molecular sieve by red mud-biomass ash-fly ash doping tempering. The method comprises the following steps: (1) proportioning fly ash, red mud and biomass ash according to a required product silica-alumina ratio, and crushing and uniformly mixing the raw materials; (2) mixing an obtained mixture with hydrochloric acid, performing reacting at 80-100 DEG C, dissolving out a reaction product, and performing separating, washing and drying to obtain a solid acid extract; (3) uniformly mixing the solid acid leaching substance with alkali, performing fusing at a temperature of 500-1000 DEG C, and dissolving, filtering and washing the obtained product to obtain an extracting solution; and (4) concentrating the extracting solution, putting the concentrated extracting solution into a hydrothermal reaction kettle, performing reacting at the temperature of 70-150 DEG C, and performing separating, washing and drying to obtain a molecular sieve crystal product. The invention comprehensively solves the problem of resourceful treatment of fly ash, red mud and biomass ash, improves the problem of low silica-alumina ratio of the traditional fly ash synthesized molecular sieve, improves the quality and yield of the molecular sieve, and provides a new way for synergetic treatment and utilization of various industrial solid wastes.

Description

technical field [0001] The invention belongs to the technical field of comprehensive resource utilization of by-product fly ash in coal-fired power generation industry, red mud from alumina plant and biomass ash produced by biomass combustion, and specifically relates to a blend of red mud-biomass ash-fly ash A method for preparing molecular sieves from heteromodulators. Background technique [0002] Zeolite molecular sieves are a class of aluminosilicates with a skeleton structure, composed of TO 4 A crystal material with a three-dimensional skeleton structure formed by connecting oxygen atoms at shared vertices of tetrahedra. Among them, T atoms usually refer to Si, Al, or P atoms, and can also be other atoms that replace Si, Al, or P. The skeleton space structure of molecular sieves is full of open regular channels and cavities, and has a huge internal surface area. It is named for its ability to sieve molecules. For nearly half a century, zeolite molecular sieves have ...

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Problems solved by technology

[0007] In order to comprehensively solve the above-mentioned fly ash, red mud and biomass ash recycling problems, the present invention provides a method for preparing molecular sieves by mixing red mud-biomass ash-fly ash and tempering. Appropriate red mud and biomass ash are used to improve the low silicon-aluminum ratio of traditional fly ash synthetic molecular sieves, improve the quality and yield of molecular sieves, and provide a new way for the coordinated treatment and utilization of various industrial solid wastes

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