Transformation of Coal Gangue to Sodalite and Faujasite Using Alkali-hydrothermal Method  

作　　者：WANG Cheng FENG Kai WANG Lipeng YU Qianru DU Fuling LI Yan YU Kaining 

机构地区：[1]Hebei Center for Ecological and Environmental Geology Research,Hebei GEO University,Shijiazhuang 050031,China [2]School of Material Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science and Technology,Xi'an 710021,China [3]School of Gemmology and Materials Science,Hebei GEO University,Shijiazhuang050031,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2023年第6期1391-1396,共6页武汉理工大学学报（材料科学英文版）

基　　金：Founded by the Foundation of Shaanxi Province Key Provence Research and Development(No.2022GY-163);the Foundation of Xianyang City Key Research and Development(No.2021ZDYFGY-0038);the Foundation of Shaanxi Provincial Education Department(No.22JC020);the Key Laboratory of Sustained Utilization&Development of Water Recourse of Hebei Province(Hebei Geo University)(No.HSZYL2021002)。

摘　　要：The coal gangue as the only source of silicon and aluminum was employed to synthesize sodalite and faujasite using hydrothermal method,which directly treated the mixture of pre-treated coal gangue and NaOH solution under hydrothermal environment.X-ray powder diffraction analysis(XRD),thermogravimetry analysis(TG)and differential thermogravimetry analysis(DTG),scanning electron microscopy(SEM),high resolution transmission electron microscopy(HRTEM),N_(2)adsorption-desorption technique,X-ray photoelectron spectroscopy(XPS),etc.were used to characterize the samples.Cd^(2+) ion was used to evaluate the heavy metal ions removal performance of the samples.The experimental results show that the coal gangue,which consists of quartz,calcium feldspar,potassium feldspar and kaolinite,can transform to sodalite and faujasite under alkali-hydrothermal condition at 150 and 180℃,respectively.The as-prepared sodalite and faujasite can effectively remove the simulated Cd2+ion wastewater and actual industrial wastewater containing As^(3+),Cd^(2+),and Cr^(3+)ions,and the good heavy metal ion removal performance of the zeolites is mainly attributed to their low Si/Al ratio and high Na+content.This alkali-hydrothermal method appears to be a simple and efficient method for transformation of coal gangue to high purity zeolites.

关 键 词：coal gangue alkali-hydrothermal method SODALITE FAUJASITE 

分 类 号：TD849.5[矿业工程—煤矿开采]