钴冶炼系统中P204反萃液有价金属的控电位硫化分离技术

Valuable metals sulfide separation under potential controlling from P204 stripping solutionin in cobalt extraction system

介绍钴冶炼工艺及P204反萃液产出,总结P204反萃液处理方法的研究进展,提出有价金属的控电位选择性分离的技术。通过热力学计算并绘制Me-S-H_2O系φ-pH图,从理论上证明有价金属的控电位选择性硫化分离技术可行;分别研究了控电位硫化除铜、控电位硫化除钴与黄药除钴、控电位硫化沉锌和中和沉锰4个过程的实施效果。结果表明:该方法可以实现有价金属的分步分离且金属回收率均可达到99%以上,沉淀物硫化铜、黄原酸钴、硫化锌和碳酸锰都可以作为冶炼原料再利用,处理后液为无害溶液可直接排放。实现了P204反萃液中有价金属分步沉淀和无害化处理的双重目的。

The production of P204 stripping solution was introduced and the common treatments of P204 stripping solution were summarized. The value metals selective separation under potential controlling from P204 stripping solution was proposed. And then, the φ-pH diagram of Me-S-H2O system was plotted based on thermodynamic calculation. Finally, both the selective separation under controlling potential of Cu, Co and Zn and Mn carbonate precipitation were studied, respectively. The precipitation rates of Cu^2+, Co^2+, Zn^2+, and Mn^2+ were as high as 99%. The precipitates, CuS, Co(C2H5OCSS)2, ZnS and MnSO4, can be reused as raw materials in metallurgy. The effluent is eco-friendly to discharge. Therefore, the goal of valuable metal selective precipitation and the less-hazardous handling of P204 stripping solution were achieved.