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Recovery of Platinum and Palladium

     

Recovery of Platinum and Palladium from Spent Catalysts:

1、Precious Metal Dissolution Method: Using high-temperature roasting, leaching with hydrochloric acid and oxidant, zinc powder displacement, dissolution with hydrochloric acid and oxidant, precipitation of platinum with solid ammonium chloride, and calcination to obtain pure platinum. The product platinum purity is 99.9% and the recovery rate is 97.8%.

2、Total Melting Leaching Method: Ion exchange adsorption of platinum (or palladium). The recovery rate of platinum is >98%, the recovery rate of palladium is >97%, and the product purity is all >99.95%. It has been applied in several factories.

3、Recovery of Palladium from Spent Palladium-Carbon Catalysts: The spent catalyst undergoes carbon burning, chlorination leaching, ammonia complexation, acidification purification, and finally reduction with hydrazine hydrate to obtain sponge palladium with purity >99.95%. A small amount of palladium in waste liquids such as complexation slag is recovered by resin adsorption. The recovery rate of palladium is >98%.

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