Patent ID: 7482387
Filing Date: 2009-01-27
Classification: C08J,Y02W

Abstract:
1. A method for processing spent ion exchange resins, comprising the following steps: (1) adding ion exchange resins in a solution of ferrous sulfate and heating the solution with stirring at a temperature between 90° C. and the boiling point of the solution; (2) adding aqueous hydrogen peroxide in the solution of (1) and adjusting pH of the resulting mixture with sulfuric acid and barium hydroxide to a range of 0.5 to 4.0 suitable for wet oxidation; (3) after adding sufficient aqueous hydrogen peroxide to complete the wet oxidation, adding barium hydroxide in the solution to increase pH of the solution, and forming barium sulfate with sulfate in the solution and at the same time, enabling ammonium ion to escape out of the solution as ammonium hydroxide or ammonia gas; and (4) after concentrating the slurry obtained in (3) and cooling, mixing with solidification agent homogeneously, and then leaving the resultant slurry standing aside for solidifying.