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Treatment method of spent uranium catalyst

  • US 9,181,605 B2
  • Filed: 08/06/2013
  • Issued: 11/10/2015
  • Est. Priority Date: 10/08/2012
  • Status: Active Grant
First Claim
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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.

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