生态环境学报2016，Vol.25Issue(8)：1382-1386,5.DOI:10.16258/j.cnki.1674-5906.2016.08.019
水封条件下黄铁矿尾矿中铊等金属的释放迁移行为
Release and Migration Behavior of Metals Such As Thallium from Pyrite Tailings under the Condition of Water Seal
摘要
Abstract
Solid waste, such as sulfide tailings, is exposed to oxidizing environment. And the acid mine wastewater generated by solid waste in the weathering is the main cause for the surrounding mining ecological environment pollution. Current domestic and foreign research work has mainly focused on the release of heavy metals in the oxidation environment. The release of heavy metals in the anoxic environment, however, is less paid attention to the environmental behavior of sulfide tailings and the potential risk of metal pollution. A water seal device of pyrite tailings leaching is designed in this work to investigate the variation of anoxic condition in different depth of leachate conductivity, dissolved oxygen, redox potential, pH and the release ability of metal such as thallium (Tl). Our results show that this method can make the water treatment system in a hypoxic environment, and inhibit the oxidation of pyrite tailings to produce acid emissions, so that the system of the reduction state in neutral is maintained. The migration behavior of different metals under the condition of water seal has opposite trend, namely, the migration activity of Tl, Pb, Cr, Al, Fe in the tailings is suppressed effectively, and reduce its emissions with the reduction of dissolved oxygen. The migration activity of Mn, As, Ni, Cu, Rb, and Sr is increased with decrease of dissolved oxygen, while, the migration activity of Mn and As is increased more obviously with the increasing of the release concentration. Heavy metals of Cu, Rb, Ni, Sr are released into the aquatic environment due to reduction of iron and manganese oxides. To sum up, the water seal method can effectively control the disposal of tailings containing sulfide to produce acid oxidation, so that to inhibit the release of metals. But it could not inhibit the release of transition metals or the metal in the form of metal oxides.关键词
黄铁矿尾矿/缺氧状态/还原作用/金属释放Key words
pyrite tailing/anoxic condition/reduction reaction/metals release分类
资源环境引用本文复制引用
李锦文,陈迪云,吴慧明,吴婉滢,陈南..水封条件下黄铁矿尾矿中铊等金属的释放迁移行为[J].生态环境学报,2016,25(8):1382-1386,5.基金项目
国家自然科学基金项目（4137264）,国家自然科学基金-广东省联合基金项目（U1501231）,广东省放射性污染控制与资源化重点实验室项目 （）
