标题: Acid rain-dependent detailed leaching characteristics and simultaneous immobilization of Pb, Zn, Cr, and Cd from hazardous lead-zinc tailing

作者: Wang, HJ (Wang, Haojie); Ju, CX (Ju, Chenxuan); Zhou, M (Zhou, Min); Chen, JA (Chen, Jiaao); Kan, XQ (Kan, Xiaoqing); Dong, YQ (Dong, Yiqie); Hou, HB (Hou, Haobo)

来源出版物: ENVIRONMENTAL POLLUTION 卷: 307 文献号: 119529 DOI: 10.1016/j.envpol.2022.119529 出版年: AUG 15 2022

摘要: In acidic medium, hazardous heavy metals of lead-zinc tailing (LZT) are easily leachable and mobilizable. Thus, the hazard, amount, form, and complexity of the leached heavy metals under acidic precipitation become a major environmental concern. This work investigates the gangue minerals, toxicity, speciation, leaching characteristics of heavy metals in LZT under simulated acid rain, as well as immobilization effects and mechanisms using a sustainable binder. In LZT, dolomite, quartz, calcite, and muscovite are the main gangue minerals, tiny hazardous metallic minerals were absorbed in the surface. The results revealed that Pb, Zn, Cr, and Cd were the predominant harmful elements, particularly Pb and Zn. Zn is leached completely and is the concerned hazardous element under simulated acid rain. In the acid rain neutralization ability test, the amount of leachable Pb, Cr, Ca, and Si maintained in equilibrium, leached Zn, Cd, Al, and Mg depended on the addition of acid. Pb and Ca were sedimented in residues. Immobilization of Pb, Zn, Cr, and Cd depended on the stability of Ca(OH)2/C-S-H of hydrates, and 70% LZTHP after curing 7 days can be used for some practical engineering projects. This work opens up deeply understandings for the leached heavy metals under acidic precipitation and improves the sustainable and safe in the field of immobilization of heavy metals.

作者关键词: Lead-zinc tailing; Detailed leaching characteristics; Heavy metals; Simulated acid rain; Column-like leaching; Immobilization

KeyWords Plus: CEMENT; BEHAVIOR; WASTE

地址: [Wang, Haojie; Ju, Chenxuan; Zhou, Min; Chen, Jiaao; Kan, Xiaoqing; Dong, Yiqie; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Zhou, Min; Hou, Haobo] Hubei Environm Remediat Mat Engn Technol Res Ctr, Wuhan 430072, Peoples R China.

通讯作者地址: Hou, HB (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

电子邮件地址: houhb@whu.edu.cn

影响因子：8.91