某铅锌矿尾矿及废石Pb、Zn释放规律实验研究

为研究铅锌矿废石和尾矿对环境的潜在影响和危害,采用静态浸出实验,研究了溶液pH值和温度对铅锌重金属离子溶出的影响;采用模拟降水动态淋滤实验方法,研究了不同酸度下,铅锌重金属离子随时间的溶出规律。结果表明,在模拟降水动态淋溶条件下,铅、锌离子都有一定的溶出浓度,离子溶出浓度随淋溶时间延长而降低;与Pb2+相比较,Zn2+的溶出受淋溶液pH值及淋溶时间的影响更大,对强酸性淋溶很敏感。

Study on Pb and Zn Mobility Low of Pb/Zn Mine Wastes and Tailings

To assess the potential impact and danger ofplumbum-zinc sulfide wastes and tailings to the environment, experiments were made on static leaching of wastes and railings for studying the characteristics of change in ion leaching with different pH value and temperature. Dynamic leaching experiments with simulated rainfall were made for studying the heavy metal ion release law of wastes and tailings under different acidity. The results showed that the pH value of soaking had evident effect on the heavy metal ion releasing, and the stronger the solution acidity was, the more the lead and zinc ions would release. Lead and zinc ions could be leached out in certain degree and the released ion concentration would decrease with the increase of leaching time under different acidic condition of dynamic leaching experiment with simulated rainfall. Compared to Pb2＋, the release of Zn2＋was more sensitive to the solution pH value and the leaching time, especially in strong acidity leaching.