可溶性硫化物介导对矿区拦泥库沉积物中重金属垂直迁移特征的影响  

Effects of soluble sulfide on the vertical migration of heavy metals in the sediment of mine retaining reservoir

作　　者：林杰锐 梁培芬 文震 谢莹莹 LIN Jierui;LIANG Peifen;WEN Zhen;XIE Yingying(School of Chemistry and Environmental Engineering,Hanshan Normal University,Chaozhou 521041,China;College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]韩山师范学院化学与环境工程学院,潮州521041 [2]深圳大学化学与环境工程学院,深圳518060

出　　处：《环境工程学报》2022年第10期3392-3401,共10页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(41907308);广东省基础与应用基础研究基金资助项目(2020A1515010533)。

摘　　要：在金属硫化物矿区中,Fe/S循环过程制约着重(类)金属的迁移转化。采用流动柱进行模拟自然淋溶实验,结合释放动力学及XRD、SEM表征探究了可溶性硫化物(S(-II))对大宝山沉积物中重金属垂直迁移规律的影响。结果表明,S(-II)对沉积物中重金属的释放具有相对的促进作用,各重金属元素释放量的大小顺序为Zn>Mn>Cu>Pb>As>Mo>Cd>Cr,呈现前期快速释放随后缓慢的过程。在质量浓度为100 mg·L^(−1)的Na2S溶液作用下,As、Cd、Cr、Cu、Mn、Mo、Pb和Zn的平均淋出浓度比10 mg·L^(−1)质量浓度处理组分别高了3.182、3.784、1.973、4.098、2.979、2.582、6.786和5.408倍。释放动力学拟合结果表明,重金属的释放过程符合双常数和Elovich模型。重金属萃取实验和XRD结果证明释放的部分重金属主要来源于沉积物中的易还原矿物相。本研究结果可为金属硫化物矿区重(类)金属污染控制与修复提供参考。The Fe/S cycle process restricts the migration and transformation of heavy metals(metalloids)in the metal sulfide mines.In this paper,the release kinetics combined with XRD and SEM was used to investigate the effects of S(-II)on vertical migration characteristics of heavy metals in sediments of Dabaoshan Mine.The results showed that S(-II)was beneficial to the release of heavy metals in sediments to a certain extent.The release of heavy metals was in the order of Zn>Mn>Cu>Pb>As>Mo>Cd>Cr,showing a rapid release in the early stage followed by a slow release process.When the concentration of S(-II)increased to 100 mg·L^(-1),the average leaching concentrations of As,Cd,Cr,Cu,Mn,Mo,Pb and Zn were 3.182,3.784,1.973,4.098,2.979,2.582,6.786 and 5.408 times higher than those of the 10 mg·L^(-1) group,respectively..Results of release kinetics fitting revealed that the release of heavy metals fitted well on Double Constant model and Elovich model.And the partly released heavy metals were mainly from easily reducible minerals in the sediments which were characterized by XRD and extraction.The results of this research could provide theoretical basis for the remediation of heavy metals in metal sulfide mining areas.

关 键 词：金属硫化物矿区 沉积物 硫离子 重金属 迁移 

分 类 号：X522[环境科学与工程—环境工程]