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采矿业产生的大量尾砂作为典型的污染源,其含有的重金属等有害成分在雨水浸淋下会直接或间接对周边环境造成污染。为研究尾砂中重金属的污染修复技术,以湖南郴州某废弃矿区的尾砂为研究对象,通过添加质量分数为2.0%的生石灰、还原铁粉、过磷酸钙等廉价修复材料,对尾砂中DTPA浸提态Pb、Zn、Cu、Cd的含量变化进行研究,并就其含量变化所体现的时间效应及机理进行探讨。研究发现,还原铁粉对尾砂的修复作用最好,其次是过磷酸钙。还原铁粉使得尾砂中DTPA浸提态Pb、Zn、Cu、Cd的含量分别降低了59.91%,56.53%,75.81%,35.78%;过磷酸钙使得尾砂DTPA浸提态Pb、Zn、Cu、Cd的含量分别降低了48.85%,44.27%,44.27%,39.23%,可为尾砂中重金属稳定化工程实施提供参考。
A large amount of tailings produced in the mining industry is a typical source of pollution, and harmful components such as heavy metals contained in the mining industry directly or indirectly pollute the surrounding environment under rainwater soaking. In order to study the technology of remediation of heavy metal pollution in tailings, tailings from an abandoned mining area in Chenzhou, Hunan Province were used as research objects. By adding low-quality restorative materials such as quicklime, iron powder and superphosphate with a mass fraction of 2.0% DTPA leaching of Pb, Zn, Cu, Cd content changes were studied, and its changes in the content of the time effect and mechanism are discussed. The study found that the reduced iron powder on the tailings repair the best, followed by superphosphate. The content of Pb, Zn, Cu and Cd in the tailing DTPA decreased by 59.91%, 56.53%, 75.81% and 35.78% respectively in the tailings with reduced iron powder. , Cd content decreased by 48.85%, 44.27%, 44.27%, 39.23% respectively, which could provide reference for the stabilization of heavy metals in tailings.