Treatment method for volume reduction of spent uranium catalyst

A treatment method of a spent uranium catalyst, wherein said spent uranium catalyst comprises a support component, said method comprising the following steps:

• selectively dissolving the support component by immersing the spent uranium catalyst in an alkali solution (step 1), thereby generating a dissolution solution and undissolved solid materials;
• separating the dissolution solution and the undissolved solid materials in the step 1 by solid-liquid separation (step 2);
• selectively precipitating the silicon ions in the dissolution solution as silicon dioxide (step 3);
• separating the silicon dioxide generated in step 3 by solid-liquid separation and purification (step 4), thereby generating a residual solution;
• precipitating uranium ions as uranium phosphate by adding phosphate to the residual solution separated in step 4 (step 5);
• separating the uranium phosphate generated in step 5 by solid-liquid separation (step 6);
• mixing the undissolved solid materials separated in step 2 with the precipitate of uranium phosphate separated in step 6 and then adding a glassification agent thereto thereby generating a mixture, followed by heat-treatment to fix the mixture in the form of a glass-ceramic composite medium (step 7).