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Recovering Precious Metals

     

The process for recovering precious metals from spent precious metal catalysts mainly consists of the following steps: pretreatment of the precious metal-bearing spent catalysts, leaching of precious metals into solution, and purification and recovery of precious metals from the solution.

The leaching solution used in this process contains sodium hypochlorite, hydrogen ions, sulfate ions and phosphate ions, which boasts the merits of low cost, low pollution, low hazard and easy industrial scalability. In addition, the mixed acid of sulfuric acid and phosphoric acid at an appropriate ratio also has outstanding properties including stable performance, non-volatility and strong capacity to dissolve precious metals.

Furthermore, staged roasting is adopted for the pretreatment of precious metal-bearing spent catalysts. This process can burn off the carbon deposits on the spent catalysts more completely, facilitating the recovery of precious metals in subsequent steps and improving the corresponding recovery rate.

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