Method for preparing white carbon black and pure zeolite molecular sieve using flyash

Abstract

The process of preparing white carbon black and pure zeolite molecular sieve with fly ash material belongs to the field of inorganic non-metal material preparing technology. The preparation process includes the following steps: roasting the mixture of high silicon fly ash with SiO2 content of 30-65 % and sodium carbonate in the weight ratio of 1 to 1-1.5 at 830 deg.c for 1 hr to obtain roasted product with sodium silicate and sodium aluminosilicate as main components; soaking the roasted product in water in 5 times to leach out sodium silicate with high water solubility, filtering to obtain sodium silicate solution, introducing CO2 to the solution and depositing to obtain white carbon black product; and further leaching desilicated fly ash with alkali solution, heating and stirring to obtain solution of sodium aluminosilicate, which is soluble in strong alkali solution, filtering, regulating pH value and crystallizing to obtain pure zeolite molecular sieve.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, relates to the comprehensive utilization of fly ash and a production method for producing white carbon black and molecular sieve materials, and is suitable for preparing A-type, X-type, Y-type, L-type, mordenite and erionite, etc. Various molecular sieves with aluminosilicate crystal skeleton structure. Background technique [0002] The main component of fly ash (about 80%) is amorphous aluminosilicate glass body, which has many similarities in composition with some natural zeolite precursors formed in craters, with silicon and aluminum in fly ash as the main components. Synthesizing zeolite molecular sieves from raw materials can not only save chemical raw materials, but also facilitate the recycling of waste and broaden the comprehensive utilization of fly ash. Although the amount of fly ash consumed by this potential application is limited, the added value of the final product ...

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Problems solved by technology

[0009] The purpose of the present invention aims at the above problems such as the fact that the dissolution rate of silicon and aluminum in the fly ash that exists in the molecular sieve is not high, the purity of the obtained molecular sieve is low, and the aluminum utilization rate in the fly ash is low. Roasting activation, after activation, the dissolution activity of silicon and aluminum in fly ash is improved

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