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为了评估钼矿尾矿的环境危害,通过105 d连续静态浸泡试验,定期监测钼矿尾矿浸泡液的pH值及其铜铅重金属离子浓度,研究了尾矿的离子溶出规律.结果表明,尾矿对酸性溶液有很强的中和能力,可将pH=3.5~6的酸性溶液在8 d内中和到pH=7的中性状态,并维持不变.液固比为1∶10的浸泡液中Cu2+和Pb2+的浓度都在25 d内达到最大值(分别为29.52和9.40μg/L),此后浓度下降,并发生震荡,但Cu2+和Pb2+的浓度随时间的变化趋势不同.浸泡液中Cu2+和Pb2+的平均浓度分别为19.37和4.29μg/L,尾矿中Cu和Pb的平均溶出率分别为0.097%和0.043%.钼矿尾矿可在中性条件下长期释放Cu2+和Pb2+,且Cu比Pb更容易溶出.
In order to evaluate the environmental hazards of the tailing of molybdenum mine, the ion leaching law of the tailings was studied through the continuous static immersion test for 105 days, the pH value of the molybdenum tailings immersion solution and the concentration of heavy metal ions of copper, lead and lead were measured periodically.The results showed that tail The ore has strong neutralization ability to acidic solution, neutralizing acidic solution with pH = 3.5 ~ 6 to neutral state with pH = 7 within 8 days, maintaining the same liquid to solid ratio of 1:10 The concentration of Cu2 + and Pb2 + in the soaking solution reached the maximum value within 25 days (29.52 and 9.40μg / L, respectively), and then decreased and oscillated, but the trend of Cu2 + and Pb2 + concentration changed with time. The average concentrations of Cu2 + and Pb2 + were 19.37 and 4.29μg / L, respectively, and the average dissolution rates of Cu and Pb in the tailings were 0.097% and 0.043%, respectively.The tailings of molybdenum ore could release Cu2 + and Pb2 + in neutral condition for a long time, Cu is more easily eluted than Pb.