关键词: 脱硅液;煤矸石;水热反应;13X分子筛

Abstract: In this study, 13X zeolite was prepared through hydrothermal process from coal gangue and the desilication solution,a kind of by-productin the alumina extraction from high alumina coal fly ash, in order to realize the low cost preparation of 13X zeolite and utilization of coal based solid waste.The effects of synthesis parameters, such as n(H2O/Na2O),n(SiO2/Al2O3),reaction temperature and stirring rate on the crystal structure and the BET surface area of the product were studied.The products was characterized by X-ray diffraction(XRD), fourier transform infrared spectroscopy(FTIR),and scanning electron microscopy(SEM).As a result, the optimum synthesis conditions of 13X zeolite is n(SiO2/Al2O3)=3.0, n(Na2O/SiO2) =1.9, n(H2O/Na2O) =60, after homogenization by aged at room temperature for 24 h, then crystallized at 95 ℃ for 8 h at 100 r·min-1.At this condition, relative crystallinity 94.59%, BET surface area up to 681.7 m2·g-1 is achieved.According to the analysis of the hydrothermal synthesized process,13X zeolite synthesis process is early mainly for coal gangue and desilication solution reaction form the amorphous gel, then gel phase dissolve and the growth of zeolite crystals.

Key words: desilication solution;coal gangue;hydrothermal synthesis;13X zeolite