铂钯精矿酸浸与还原工艺的试验探索  

Experimental Exploration of Acid Leaching and Reduction Process of Platinum-palladium Concentrate

作　　者：王亚东 房孟钊 黄向祥 赵浩然 WANG Ya-dong;FANG Meng-zhao;HUANG Xiang-xiang;ZHAO Hao-ran

机构地区：[1]大冶有色金属有限责任公司,湖北黄石435002 [2]有色金属冶金与循环利用湖北省重点实验室,湖北黄石435002

出　　处：《有色冶金节能》2020年第6期34-37,48,共5页Energy Saving of Nonferrous Metallurgy

摘　　要：针对铂钯精矿酸浸和三次还原工艺流程长,还原剂亚硫酸钠用量大、利用率低,碲的损失量大、直收率低的问题,进行工艺流程简化的探索。对比试验结果表明,碱浸渣和净化渣的主要成分是单质碲,具有一定的还原性,因此在铂钯精矿酸浸工序中加入一定量的碱浸渣或净化渣,通过控制电位,酸浸液中的贵金属将完全进入酸浸渣中,原有工艺可以省去一次还原工序;通过改变亚硫酸钠的添加方式,将终点电位控制在300 mV以下,可以提高亚硫酸钠的利用率,一次彻底还原酸浸液中的碲,原有工艺可以省去第三次还原工序。酸浸和还原工艺流程的简化缩短了碲的生产周期,降低了生产成本。Aiming at the problems of long technological process of acid leaching and three-step reduction of platinum palladium concentrate,large amount of reducing agent sodium sulfite,low utilization rate,large loss of tellurium and low direct yield,the process flow simplification was explored.The comparative test results showed that the main component of alkali leaching residue and purification residue was elemental tellurium,which had a certain degree of reduction.Therefore,a certain amount of alkali leaching residue or purification residue was added to the acid leaching process of platinum-palladium concentrate.By controlling the potential,the precious metals in the acid leaching solution can completely enter the acid leaching residue,and the original process can save the first reduction process.By changing the way of adding sodium sulfite,and controlling the end point potential below 300 mV,the utilization rate of sodium sulfite can be improved and the tellurium in acid leaching solution can be completely reduced once,the original process can save the third reduction process.The simplification of acid leaching and reduction process shortened the production cycle of tellurium and reduced the production cost.

关 键 词：铂钯精矿 碱浸渣 净化渣 电位控制 亚硫酸钠还原 工艺简化 

分 类 号：TF111.3[冶金工程—冶金物理化学]