| The comprehensive recovery of platinum and aluminum in spent reforming catalysts by a pressurized alkaline dissolution was studied. The results showed that the optimum conditions were as follows: 1.2:1 of alkali to material ratio, 2% of spent catalysts amount as sodium formate amount, 180℃ of reaction temperature, and 2 h of reaction time. Under the optimal conditions, the dissolution rate of catalyst carrier was above 98%, while platinum was not dispersed, and the grade of platinum in the insoluble residue was more than 20%.The leaching solution was about 5 cubic meters per ton of spent catalyst, and the crystal obtained by direct evaporation of leaching solution meets the product standard of industrial sodium aluminate, and the comprehensive utilization of platinum and aluminum in spent catalysts was realized. |
