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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2022, Vol. 41 ›› Issue (2): 401-414.

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Research Progress of Zeolite Na-X Synthesis from Minerals and Waste Residues

YANG Ningwei1, AN Liangcheng2, LYU Junmin1, LIU Suli2, WANG Zheng1, TUO Jie1, GAO Xinhua1, FAN Subing1   

  1. 1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China;
    2. Ningxia Coal Industry Group Co., Ltd., State Energy Resources Investment Corporation, Yinchuan 750411, China
  • Received:2021-06-01 Revised:2021-08-05 Online:2022-02-15 Published:2022-03-01

Abstract: Porous zeolite Na-X with larger specific surface area and more ion-exchange capacity is usually applied in wastewater treatment, adsorption and separation of gases, and so on. It is traditionally prepared from the Si and Al-containing inorganic salts. Many minerals and solid waste residues such as coal fly ash, coal gangue, kaolin, oil shale, rice husk ash and bagasse which contain high concentration of Si and Al element can be used for the zeolite Na-X synthesis after pretreatment. The compositions of minerals and solid wastes, as well as the research progress of the synthesis of zeolite Na-X were reviewed, and the pretreatment processes, crystallization kinetics and crystallization mechanism were discussed. Moreover, the effects of synthesis conditions including SiO2/Al2O3 ratio, crystallization temperature and time, anions and cations, H2O/SiO2 ratio, alkali/ash ratio, ultrasonic treatment, and organic additive on the synthesis of zeolite Na-X from minerals and solid wastes were analyzed.

Key words: utilization of solid waste, synthesis of zeolite, mineral, coal fly ash, zeolite Na-X, crystallization kinetics, crystallization mechanism, synthesis condition

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