永平低品位黄铜矿矿石细菌浸出的银离子催化效应

为了提高用氧化亚铁硫杆菌和氧化硫硫杆菌混合菌对永平铜矿低品位黄铜矿矿石细菌浸出的效果,通过摇瓶实验,研究了银离子的催化效应。研究表明,在细菌浸出的初始阶段,添加银离子可以大大加快铜的浸出速度和提高铜的浸出率,其中添加初始银离子浓度10 mg/L时,最有利于铜的浸出,在600 h时内铜的浸出率可以从20%增加到65%,比不添加银离子时提高了45%。添加初始银离子使矿石中铁的浸出和溶液中二价铁的细菌氧化明显受到抑制。当有银离子时,低品位黄铜矿矿石在低氧化还原电位下比高氧化还原电位更有利于铜的浸出。

Catalytic effect of Silver Ion on bioleaching of Low - grade Chalcopyrite Ore from Yongping Copper Mine

In order to improve the bioleaching effect of low-grade chalcopyrite ore from Yongping Copper Mine using mixed thiobacillus ferrooxidans and thiobacillus thiooxidans,the catalytic effect of silver ion added in the solution on the bioleaching of the chalcopyrite ore was investigated by tests in shaking flasks.The results show that the addition of silver ion can greatly accelerate the dissolution velocity and the leaching rate of copper at the initial stage of the bioleaching,in which the dosage of 10 mg /L of silver ion is most beneficial to the dissolution of copper and after 600 h bioleaching the leaching rate of copper can be increased from 20% to 65% with 45% increase comparing with that without addition of silver ion.The addition of silver ion obviously depressed the dissolution of iron and the bacterial oxidation of Fe2 in solution.At the presence of sliver ion,the low oxidation potential was more favorable to the copper dissolution than the high potential for low-grade chalcopyrite ore.