Treatment method for volume reduction of spent uranium catalyst
First Claim
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1. 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).
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Abstract
A volume reduction treatment method able to reduce the volume of the final disposal waste of a spent uranium catalyst. As a result, the disposal cost of the spent uranium catalyst is able to be reduced and the utilization of waste repositories are able to be improved.
1 Citation
21 Claims
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1. 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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification