Treatment method of spent uranium catalyst

摘要

The present invention relates to a treatment method of spent uranium catalyst, and more specifically, to a method which can considerably reduce the volume of the spent uranium catalyst to be disposed of and simultaneously minimize secondary wastes that can be generated during the process of treating the spent uranium catalyst.

主权项

1. A treatment method of a spent uranium catalyst, comprising steps of:
Step 1: dissolving the spent uranium catalyst in an alkaline solution, taking at least a part of undissolved spent uranium catalyst out from the alkaline solution and dissolving the at least a part of undissolved spent uranium catalyst further in an acidic solution; Step 2: precipitating Si by either (a) adding carbonate and hydrogen peroxide into the alkaline solution in which the spent uranium catalyst is dissolved at Step 1 and adjusting pH to 6˜10 or (b) by adding one selected from the group consisting of MgCl2, CaCl2, KCl, and NaCl while lowering pH of the alkaline solution in which the spent uranium catalyst is dissolved at Step 1 to pH 4 or below to generate a supernatant of the alkaline solution, and precipitating metal materials of the spent uranium catalyst by adding hydrogen peroxide into a mixture solution of the acidic solution in which at least a part of the undissolved spent uranium catalyst is dissolved at Step 1 and the supernatant of the alkaline solution in which the Si is precipitated while adjusting pH to generate a supernatant of the mixture solution; and Step 3: removing uranium from the supernatant of the mixture solution after the metal materials are precipitated.