铜镍尾矿细菌浸出的试验研究

Experimental Investigation on Bio-leaching Cu-Ni Ore Tailings

通过正交试验研究了pH值、矿浆质量分数、矿石粒度、细菌接种量、表面活性剂吐温20用量对铜镍矿尾矿细菌浸出的影响.试验结果表明,铜浸出的最佳条件:pH值为1.5,矿石粒度为小于0.074 mm,接种量(体积分数)为50%以及不添加表面活性剂;镍浸出的最佳条件:pH值为1.0,矿石粒度为大于0.147mm,接种量(体积分数)为25%及不添加表面活性剂.细菌氧化后,铜和镍的浸出率分别达到63.41%和91.74%.

The effects of pH value, mass fraction of pulp, ore particle size, inoculation concentration and dose of the surfactant Tween 20 on the bio-leaching rates of copper and nickel in Cu-Ni ore tailings were investigated through orthogonal test. The experimental results showed that the optimum conditions for copper extraction by bio-oxidation of Cu-Ni ore railings are pH value 1.5, particle size less than 0.074mm, inoculation concentration 50%, with no use of the surfactant Tween 20. And the optimum conditions for nickel extraction are pH value 1.0, particle size bigger than 0. 147 mm, inoculation concentration 25 %, with no use of the surfactant Tween 20. The copper and nickel leaching rates are thus up to 63.41% and 91.74 %, respectively, after bio-oxidation.