环境工程学报2025，Vol.19Issue(9)：2247-2256,10.DOI:10.12030/j.cjee.202408109
浸矿作用下某稀土矿土壤重金属铊的释放规律及钝化修复
Release patterns and stabilization remediation of heavy metal thallium in soil from a rare earth mine under leaching conditions
摘要
Abstract
To investigate the release patterns of heavy metal thallium(Tl)in soil from rare earth mining areas under leaching conditions and the stabilization mechanism of biochar for Tl,contaminated soil from a rare earth mine in southern Jiangxi was selected as the study subject.Static soaking and dynamic leaching experiments,combined with kinetic models and SEM analysis,were conducted.Experimental results showed that,under static conditions,the mass concentration of Tl in acidic leaching agents and acid rain was 27.75 and 1.55 times higher,respectively,than that in neutral rainwater.Under dynamic conditions,the corresponding values were 21.71 and 1.31 times higher.Acidic ions promoted the release of heavy metal Tl from soil,facilitating the transformation of Tl from a residual to an active state.Kinetic model fitting results indicated that the leaching release of Tl in the study area aligns more closely with the modified Elovich equation,suggesting that Tl release in soil was not a simple diffusion process but rather the result of multiple interacting mechanisms.After the addition of biochar,Tl release decreased by 34%,with Tl in the soil converting from an active state to a residual state.SEM analysis revealed that biochar addition reduces soil erosion and enhances its porous structure,effectively inhibiting the migration and release of Tl in soil.These findings provide theoretical support for the remediation of Tl-contaminated soil in rare earth mining areas.关键词
稀土矿/铊/释放特征/生物炭钝化/动力学模型Key words
rare earth mine/thallium(Tl)/release characteristics/biochar stabilization/kinetic model分类
资源环境引用本文复制引用
张沁宁,张强,叶义生,朱红霞,许模,陈雨..浸矿作用下某稀土矿土壤重金属铊的释放规律及钝化修复[J].环境工程学报,2025,19(9):2247-2256,10.基金项目
国家自然科学基金资助项目(41472275) （41472275）
江西省地质局生态修复公益资助项目(2024STXF04) （2024STXF04）
四川省自然科学基金青年资助项目(2024NSFSC0848) （2024NSFSC0848）
