以铜阳极泥中间物料分金渣为原料,提出一种"亚钠分银-酸化沉银-净化除杂-银粉还原"的全湿法短流程制备高纯银粉的新工艺.对工艺的机理及最佳工艺条件进行研究,在最佳工艺条件下,银的浸出率达到98.4%,粗氯化银中杂质元素Pb和Te的脱除率分别为97.7%和96.7%,银的直收率到达98.1%.采用OES、XRD、SEM检测方法对产物的化学成分、表观形貌和晶体结构分析.结果表明:制备出颗粒均匀的99.995%高纯银粉.
The copper anode slime intermediate material gold separating residue was used as raw material and a new hydrometallurgical process of high purity sliver powder preparation was proposed, the process comprising following steps: sodium sulfite leaching silver, acidification deposit silver, purification and sliver reduction. The reaction mechanism and optimum conditions of process were investigated. Under the optimum conditions, the leaching rate of silver reaches 98.4%, the removal rates of impurity element Pb and Te in silver chloride reach 97.2% and 96.7%, respectively, and the direct recovery rate of Ag reaches 98.1%. The chemical composition, morphology and crystal structure of product were analyzed by optical emission spectrometry (OES), scanning electron microscopy (SEM) and X-ray diffractometry (XRD), respectively. The results show that high purity 99.995% silver powder with uniform morphology and particle is prepared.
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