Synthesis of ternary geopolymers using prediction for effective solidification of mercury in tailings  

作　　者：Xuan Lu Jinfa Guo Fang Chen Mengkui Tian 

机构地区：[1]School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China

出　　处：《Journal of Environmental Sciences》2025年第1期392-403,共12页环境科学学报(英文版)

基　　金：supported by the National Key R&D Projects of China(No.2018YFC1801706-01);the National Natural Science Foundation of China(No.22162007);the Science and Technology Supporting Project of Guizhou Province(No.[2021]480,[2023]379);the Wengfu(Group)Co.,Ltd.Technology Development Project(No.WH-220787(YF));the Project from Guizhou Institute of Innovation and Development of Dual-carbon and New Energy Technologies(No.DCRE-2023-05)。

摘　　要：This study used steel slag,fly ash,and metakaolin as raw materials(SFM materials)to create silica-alumina-based geopolymers that can solidify Hg^(2+)when activated with sodiumbased water glass.The experiments began with a triangular lattice point mixing design experiment,and the results were fitted,analyzed,and predicted.The optimum SFM material mass ratio was found to be 70%steel slag,25%fly ash,and 5%metakaolin.The optimum modulus of the activator was identified by comparing the unconfined compressive strength and solidifying impact on Hg^(2+)of geosynthetics with different modulus.The SFM geopolymer was then applied in the form of potting to cure the granulated mercury tailings.The inclusion of 50%SFM material generated a geosynthetic that reduced mercury transport to the surface soil by roughly 90%.The mercury concentration of herbaceous plant samples was also reduced by 78%.It indicates that the SFM material can effectively attenuate the migration transformation of mercury.Finally,characterization methods such as XPS and FTIR were used to investigate the mechanism of Hg^(2+)solidification by geopolymers generated by SFM materials.The possible solidification mechanisms were proposed as alkaline environment-induced mercury precipitation,chemical bonding s,surface adsorption of Hg^(2+)and its precipitates by the geopolymer,and physical encapsulation.

关 键 词：MERCURY GEOPOLYMER SOLIDIFICATION TAILINGS 

分 类 号：TQ172[化学工程—水泥工业]