从低品位金铂钯物料中提取贵金属新工艺研究

Research on New Technology for Extracting Precious Metals from Low Grade Gold Platinum Palladium Material

金川集团股份有限公司产生的低品位金钯铂物料为蒸残渣,通常是由贵金属精矿蒸馏分离锇、钌,水溶液氯化产生。现有蒸残渣处理工艺为反复氯化,由于受氯化效率的影响,依然有部分贵金属残留在外付渣中,造成贵金属流失。为提高贵金属回收率,金川集团贵金属冶炼厂组织进行了从蒸残渣中提纯贵金属的实验研究。通过长期实验探索,确定了蒸残渣氯化焙烧—盐酸浸出—有机溶剂萃取分离金铂钯的工艺路线。之后,又进行了工业化扩大试验,确定了最佳工艺技术条件,金、铂、钯直收率≥95%。与水溶液氯化工艺相比,该工艺具有贵金属直收率高、劳动强度低、生产周期短及生产成本低等特点。

The company produced platinum and palladium low grade gold material that was a kind of steamed residue,additionally,the steamed residue was produced during the process of precious metals concentrate distillation separation of osmium,ruthenium and aqueous chlorination.The existing steamed residue treatment technique of chloride repeatedly,because the effect of the efficiency of chloride,there were still some precious metal residues in the outside pay residue,has the problem of precious metals lossing.In order to improve the precious metal recovery,the smelting plant in the company completed a series of experimental studies on purification of precious metals from the steamed residue.Thus,after the experimental exploration for a long time,the steamed residue chloridizing roasting-hydrochloric acid leaching gold platinum palladium-organic solvent extraction separation process was determined.Then,the industrialized expanding test and the optimum technology conditions were also determined,meanwhile,the direct recovery rate was more than or equal to 95% during the technological process of gold,platinum and palladium.Compared with aqueous chlorination process,the method applied in the paper had advantages of high recovery efficiency for precious metals,low labor intensity,short production cycle and low production cost.