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配制模拟铜冶炼污泥的硫酸浸出液作为电解原液,考察了旋流电解技术分离提取溶液中Cu,Zn,Ni 3种有价金属的效果。结果表明,旋流电解可以实现3种有价金属的分步电解分离,实验中直接获得了电解铜和电解锌产品。对于Cu,Zn,Ni混合溶液的旋流电解过程,Cu优先在阴极电解,电解铜产品以铜粉为主,另含有少量的铜片;电流密度越大,Cu的沉积速度越快,在电流密度为0.04 A·cm-2时,30 min内Cu的回收率达到54.4%;由于Cu的电阻率较低,因此其在阴极上的沉积可以提高系统的导电性,从而使槽电压下降,降低能耗。对于Zn,Ni混合溶液的旋流电解过程,Zn优先于Ni电解,在阴极得到形貌较好的Zn板;槽电压随运行时间下降较电解铜时更加缓慢,30 min内仅下降9.1%;电解产品上部有Ni沉积,且表面由于氢的析出产生类似月球表面环形山的椭圆坑;旋流电解槽内部的旋流流态加之镍的特殊超电势使得Zn优先于Ni电解。
Preparation of simulated copper smelting sulfuric acid leachate as the electrolytic solution, investigated by the swirling electrolysis separation of Cu, Zn, Ni solution of three kinds of valuable metals. The results show that the swirling electrolysis can realize the stepwise electrolysis separation of three kinds of valuable metals, and the electrolytic copper and electrolytic zinc products are directly obtained in the experiment. For the swirling electrolysis process of Cu, Zn and Ni mixed solution, Cu is preferentially electrolyzed in the cathode. The copper products are mainly composed of copper powder and the other contains a small amount of copper flakes. The larger the current density, the faster the deposition rate of Cu, The Cu recovery rate reached 54.4% within 30 min at a density of 0.04 A · cm-2. Due to the lower resistivity of Cu, its deposition on the cathode can improve the conductivity of the system and thus reduce and reduce the cell voltage Energy consumption. For the swirling electrolysis process of Zn and Ni mixed solution, Zn is better than Ni electrolysis, and the Zn plate with good morphology is obtained at the cathode. The cell voltage decreases more slowly with elec- trolytic time and only decreases 9.1% within 30 min. Electrolytic products with Ni deposition on the upper part, and the surface due to the precipitation of hydrogen produced similar to the lunar surface of the crater elliptical pit; swirling flow inside the cell coupled with the special super-potential of nickel makes Zn take precedence over Ni electrolysis.