Dynamic Study on the Release and Migration of Heavy Metals during the Oxidation of Lead-Zinc Tailings
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摘要:
铅锌尾矿堆放造成矿山周边环境严重污染，为研究尾矿安全堆放并在堆放过程中去除一定量重金属，以广西大厂鲁塘铅锌尾矿为研究对象，研究在不同氧化剂浓度和不同液固比条件下Zn、Cd、Pb、Cu和As的释放迁移能力。结果表明：氧化环境可以有效促进各元素的释放迁移能力，氧化剂浓度越高各元素迁移出的量也越多；各元素较佳释放迁移的液固比不同，Zn元素的最适合固液比为1∶10，Cd元素的最适合固液比为1∶6，Pb元素的较适合固液比为1∶6，Cu元素的较适合固液比为1∶5，As元素的较适合固液比为1∶6。
Abstract:The dumping of lead-zinc tailings causes serious environmental pollution around the mine. In order to study the safe dumping of tailings and the removal of a certain amount of heavy metals during the dumping process, the release and migration of Zn, Cd, Pb, Cu and As under different oxidant concentrations and different liquid to solid ratios were investigated in lead-zinc tailings of Lutang, Dachang, Guangxi. The results show that the oxidizing environment can effectively promote the release and migration of the elements. The higher the oxidant concentration, the more the elements can be migrated out. The optimum liquid-solid ratio for release and migration varies among the elements, with the most suitable solid to liquid ratio being 1∶10 for Zn and 1∶6 for Cd, 1∶6 for Pb, 1∶5 for Cu and 1∶6 for As.
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Key words:
- Lead-zinc mine /
- Heavy metals /
- Release migration /
- Tailings
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