Method for recovering precious metal from metal carrier catalyst

Abstract

A method for recovering precious metal held in a metal carrier catalyst from said catalyst, that includes a step (1) in which the catalyst is heated in a nitric acid solution, and a step (2) in which the post-step (1) catalyst is heat treated in a sulfuric acid solution.

1 . A method for recovering precious metal loaded on a metal carrier catalyst from the catalyst, comprising:
 1) a step for heating the catalyst in a nitric acid solution, and   2) a step for heat-treating the catalyst obtained by step 1) in a sulfuric acid solution.   
     
     
         2 . The method according to  claim 1 , wherein the heating of step 1) is carried out at 90° C. or higher for about 40 minutes to 60 minutes. 
     
     
         3 . The method according to  claim 1  or  2 , wherein the heating of step 2) is carried out at 90° C. or higher for about 30 minutes to 120 minutes. 
     
     
         4 . The method according to any of  claims 1  to  3 , further comprising a step for washing the catalyst obtained by step 2) with water.