| Enrichment and recovery of Pt from spent petroleum reforming catalyst by ammonium salt roasting-acid leaching process were studied. The result showed that, when the roasting suitable conditions as follows: (NH4)2SO4 to spent catalysts mass ratio 7.5, roasting temperature 350℃, roasting time 5 h; and acid leaching conditions as follow: H2SO4 condition concentration 0.5 mol/L, leaching time 3h, leaching temperature 80℃, liquid to solid ratio 12.5, the enrichment of Pt is more than 274 times. Main mineral phase in the roasted product is NH4Al(SO4)2, the product was leached with acid, realizing enrichment and recovery of Pt by acid leaching. |
