过硫酸铵氧化沉淀法富集净化钴渣中钴的试验研究

某公司生产初期采用α-亚硝基-β-萘酚除钴工艺回收湿法炼锌净化钴渣中的钴,存在药剂消耗量大、钴渣含钴低、生产亏损的问题,后采用过硫酸铵氧化沉淀法富集钴,形成了一种钴的富集倍数高,成本低、流程短、易操作、环保的净化渣回收钴的实用方法.该方法分三个阶段:酸浸阶段包括稀酸选择性浸出和逆流酸性浸出,在较优工艺参数下,钴的浸出率...

Experimental study on cobalt enrichment of purification cobalt residue by ammonium persulfate oxidation precipitation method

In the early stage of production,a company usedα-nitroso-β-naphthol process to recover cobalt from the purifying cobalt slag from wet zinc smelting.There were problems such as large consumption of chemical agents,low cobalt content in cobalt enrichment slag,and benefit deficit.The company later adopted ammonium persulfate oxidation precipitation method to enrich cobalt,forming a practical method for recovering cobalt from purification slag with high cobalt enrichment ratio,low cost,short process,easy operation and environmental protection.The method is divided into three stages.The acid leaching stage includes dilute acid selective leaching and countercurrent acid leaching.Under the better process parameters,the leaching rate of cobalt reaches 95.8%;the Fe content of the filtrate is less than 80 mg/L under the better process parameters in the oxidation iron removal stage;the cobalt oxide precipitation stage can obtain cobalt-rich slag containing 20%cobalt and 18%-20%zinc.While the cobalt-precipitating slag is washed with acid water,a cobalt-rich slag containing less than 10%zinc and more than30%cobalt can be obtained,which can be sold as cobalt concentrate.The process equipment is simple,the process is short,and the cost is controllable.It can provide a reference for the comprehensive recovery of valuable metals in purification slag from zinc hydrometallurgy.