Abstract:Ammonia complexing slag is an intermediate material rich in platinum and palladium produced in the process of recovering precious metals from silver anode slime. It is an important secondary resource for extracting platinum group metals in nonferrous smelting industry. In view of the study on the treatment of ammonia complexing slag, it is proposed to use coke as reducing agent and PbO as trapping agent to achieve efficient enrichment of platinum group elements in ammonia complexing slag under high temperature with the assistance of slag forming agent. The effects of PbO ratio, reductant ratio, alkalinity, reduction temperature and reduction time on the collection rate of platinum group elements in ammonia complexing slag are investigated. The results show that under the optimal experimental conditions of the mass ration of PbO is 9%, the mass ration of reductant is 8%, the alkalinity is 1, the reduction time is 5h, and the reduction temperature is 1450℃, the enrichment rates of palladium and platinum can reach 99.08% and 98.25%,respectively.