Inherently safe in situ uranium recovery

United States Patent

8,708,422
April 29, 2014
View the Complete Patent at the US Patent & Trademark Office
Inherently Safe In-Situ Uranium Recovery
An in situ recovery of uranium operation involves circulating reactive fluids through an underground uranium deposit. These fluids contain chemicals that dissolve the uranium ore. Uranium is recovered from the fluids after they are pumped back to the surface. Chemicals used to accomplish this include complexing agents that are organic, readily degradable, and/or have a predictable lifetime in an aquifer. Efficiency is increased through development of organic agents targeted to complexing tetravalent uranium rather than hexavalent uranium. The operation provides for in situ immobilization of some oxy-anion pollutants under oxidizing conditions as well as reducing conditions. The operation also artificially reestablishes reducing conditions on the aquifer after uranium recovery is completed. With the ability to have the impacted aquifer reliably remediated, the uranium recovery operation can be considered inherently safe.
13/084,391
April 11, 2011
299/5 ; 210/170.01; 210/170.04; 210/747.1; 210/749; 210/912; 423/18; 423/2;
E21B 43/28 (20060101); E21C 41/16 (20060101); C22B 60/02 (20060101); B01F 1/00 (20060101); B01D 11/00 (20060101); C01G 56/00 (20060101); C01G 43/00 (20060101); C01F 15/00 (20060101); C01F 13/00 (20060101); C02F 1/00 (20060101); E02B 15/00 (20060101); C02F 1/68 (20060101);
STATEMENT OF GOVERNMENTAL INTEREST This invention was developed under contract DE-AC04-94AL85000 between Sandia Corporation and the U.S. Department of Energy. The U.S. Government has certain rights in this invention.