METHOD FOR RECOVERING PRECIOUS METALS FROM METAL-CARRIER CATALYST CONVERTER

PURPOSE:To recover precious metals efficiently by heat treating metal-carrier catalysts in an alkali solution, separating alumina coat layers carrying precious,metals from the metal carriers, treating thereafter the alumina coat layers with strong acids. CONSTITUTION:Metal-carrier catalyst converter or metal-carrier catalysts taken out of metal-carrier catalyst converter are heat treated in alkali solutions so that alumina coat layers carrying precious metals are separated from metal carriers. The alumina coat layers carrying precious metals separated are treated with strong acids to cause precious metals to be dissolved and recovered. In more concrete descriptions, after blowing hydrogen gas into the strong acids into which precious metals have been dissolved to precipitate the black of the precious metals, said black is dissolved into aqua regia, to which nitrous acids are added to precipitate Rh, after which dimethylglyoxim is added thereto to precipitate Pd, which is finally concentrated to recover Pt.