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Synthesis of ternary geopolymers using prediction for effective solidification of mercury in tailings
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Synthesis of ternary geopolymers using prediction for effective solidification of mercury in tailings
This study used steel slag,fly ash,and metakaolin as raw materials(SFM materials)to cre-ate silica-alumina-based geopolymers that can solidify Hg2+when activated with sodium-based water glass.The experiments began with a triangular lattice point mixing design ex-periment,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 Hg2+of geosynthetics with different modulus.The SFM geopoly-mer 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 Hg2+solidification by geopolymers gen-erated by SFM materials.The possible solidification mechanisms were proposed as alka-line environment-induced mercury precipitation,chemical bonding s,surface adsorption of Hg2+and its precipitates by the geopolymer,and physical encapsulation.
MercuryGeopolymerSolidificationTailings
Xuan Lu、Jinfa Guo、Fang Chen、Mengkui Tian
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School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China
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