One of the waste platinum and rhodium catalysts is recovered. The Institute of Materials Recycling and Cooperation cooperates with Changling Refinery to adopt the method of “full dissolution†leaching, ion exchange adsorption of platinum rhodium, and precipitation agent to separate platinum rhodium. The platinum recovery rate is >98%, the ruthenium yield is >93%, the purity of the platinum ruthenium product is >99.95%, and the tail liquid aluminum sulfate can be used as the raw material for the production of catalyst. Second, Tsinghua University and Beijing dilute precious metals refinery cooperation. The platinum ruthenium in the spent catalyst is recovered by extraction. The spent catalyst is dissolved in 40% sulfuric acid, the hydrazine is extracted with 40% diisooctyl sulfoxide, the stripping solution produces potassium citrate, the sulfuric acid insoluble slag is burned to remove carbon, the acid is immersed in platinum, and the leaching platinum solution is 40%. The platinum is extracted by diisooctyl sulfoxide, and the counterplating solution is reduced by platinum. The extraction rate of platinum is >99%, the stripping rate is >99%, the platinum yield is >97%, the product platinum purity is 99.9%; the extraction rate of bismuth is >99%, and the rejection rate is >99%.
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