| 摘要 |
<p>PURPOSE:To easily extract and recover platinum-group metals in inorg. acid from spent catalyst in high yield by mixing the spent catalyst carrying platinum- group metals with the inorg. acid and an oxidizing agent in a closed vessel, adding an inorg. acid concn. improver and heating the admixture. CONSTITUTION:The spent catalyst contg. platinum-group metals such as Pt, Pd and Rh an Ce is pulverized to <=100 mesh and introduced into a closed elution vessel having an agitator, an inorg. acid such as hydrochloric acid and sodium hypochlorite as an oxidizing agent are added, agitated and heated to 60-180 deg.C, PCl3, etc., generating HCl by the reaction with water is introduced and decomposed to generate HCl, and the concn. of the hydrochloric acid as the inorg. acid in the vessel is increased above the saturation concn. under atmospheric pressure. As a result, the platinum-group metals such as Pt, Pd and Rh in the spent catalyst are extracted and recovered in the hydrochloric acid soln. at a high recovery rate.</p> |
