从钴铬铂靶材废料中回收纯铂

Recovery of Platinum from Waste Co-Cr-Pt Target Material

采用氧化酸溶-氯化铵沉淀-离子交换的方法从钴铬铂靶材废料回收铂。物料溶解的最佳条件为:液固比6:1(m L/g)、氧化剂氯酸钠用量35 g、于95℃经4 h可完全溶解100 g物料。溶解液经氯化铵选择性沉淀铂后,主体杂质元素钴和铬被去除。获得的粗铂溶解后经离子交换提纯,微量杂质元素的含量进一步降低。最终煅烧获得的海绵铂纯度大于99.995%,满足钴铬铂靶材的再生产的要求。

Platinum in waste Co-Cr-Pt target material was recovered by using a three-step method of oxidizing acid dissolution,precipitation with ammonium chloride and ion exchange.100 g waste Co-Cr-Pt was totally dissolved at 95℃for 4 hours by 35 g sodium chlorate in 400 mL HCl.The liquid-solid ratio was 6 mL:1/g.Most of the impurities,including cobalt and chromium,were removed from the solution after platinum was selectively precipitated by ammonium chloride.The platinum was further refined by ion-exchange to get rid of residual impurity elements.The purity of the resulting platinum was more than 99.995%,meeting the requirements for the reproduction of Co-Cr-Pt target material.