| 摘要 |
<p>PURPOSE:To recover platinum group metals in superior yield by applying heating and rapid cooling to a used waste catalyst in which platinum group metals or oxides thereof are carried on a metallic carrier, peeling a catalytic activity layer from the metallic carrier, and carrying out chemical treatment. CONSTITUTION:In the case when the activity of a catalyst prepared by thermally spraying Al on the surface of a metallic carrier of Ni, etc., and carrying out oxidation treatment to provide a catalytic activity layer of gamma-alumina and allowing platinum group metals, such as Pt, Pd, and Rh, and oxides thereof to be supported as a catalyst on the above alumina is reduced, the catalyst is heated in an electric furnace and thrown into water to undergo rapid cooling, by which the gamma-alumina the platinum metal catalyst is peeled and separated from the metallic carrier by the difference in coefficient of thermal expansion. This gamma-alumina containing the catalyst is treated with an aqueous solution of NaOH and dissolved and removed, by which the platinum group metals and oxides thereof as catalyst can be recovered in high yield.</p> |
