Method for recovering platinum from indissolvable alpha-Al2O3-based platiniferous dead catalyst

The invention discloses a method for recovering platinum from an indissolvable alpha-Al2O3-based platiniferous dead catalyst. The method comprises the following concrete steps of (1) alkali roasting:firstly, mixing sodium hydroxide with potassium hydroxide to obtain a mixture, then, mixing the mixture with the dead catalyst, and putting in a muffle furnace for roasting; (2) water leaching: directly adding water into a roasted material for water leaching; (3) filtering: filtering after water leaching to obtain potassic sodium aluminate solution and an enriched product of platinum, and regulating the pH (Potential of Hydrogen) value of the potassic sodium aluminate solution to be 1 to 2 with acid for direct sale; and (4) chloridizing leaching: adding the enriched product of platinum into hydrochloric acid, and adding sodium chlorate for leaching; filtering to obtain platiniferous solution and insoluble dregs, and performing alkali roasting on the insoluble dregs again. According to themethod disclosed by the in