Abstract:Aiming to achieve a short and efficient separation of platinum, palladium and rhodium in solution, the separation and purification of platinum, palladium and rhodium in precious liquids, as well as the dispersion law of rhodium, were systematically studied. The separation and purification of platinum, palladium and rhodium in precious liquids was explored through the process of platinum precipitation with NH4Cl, palladium oxidation precipitation, and rhodium precipitation with DETA. After the separation of platinum, palladium and rhodium, only about 20% of the total rhodium was present in the liquid compared to the initial precious liquids. Rhodium was dispersed by 14.59% and 65.33% in the platinum and palladium refining purification processes, respectively. The strategy of using DETA precipitation method to preferentially separate rhodium from the precipitation of palladium rhodium mixtures was adopted, achieving a direct precipitation yield of 77.25%. This strategy greatly simplified the rhodium separation process.