Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Radioactive metal
Patent
1994-07-08
1996-11-12
Mai, Ngoclan
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Radioactive metal
4236585, 134 3, 209 2, C01G 4300
Patent
active
055737382
ABSTRACT:
Soil, contaminated with radioactive material such as uranium, is treated to remove the radioactive contaminant. The soil is first pre-processed to remove and clean oversized particles for release back to the environment as recovered soil. Pre-processing also includes removal of metallic uranium from the soil by gravimetric separation for off-site disposal. An aqueous slurry is formed from the pre-processed feed which is fed to a mechanical separation device. Particles greater than 10 mesh are crushed to provide a uniform feed slurry. The slurry is processed in an aqueous leaching solution of sulfuric acid, hydrogen peroxide and iron to remove uranium. Particulate matter is removed from the acidic slurry; the remaining fine particulate matter is then submitted to a second-stage leaching to remove residual uranium. Uranium is recovered from the combined leaching solutions by either a two-stage precipitation process or by passage over an ion-exchange material. The process utilizes a closed loop system for process water which is reclaimed, clarified, and recirculated for reuse.
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Chow Andrea W.
Ma Jonathan K.
May Ronald F.
Peters David W.
Ranger Scott A.
Dehlinger Peter J.
Evans Susan T.
Lockheed Martin Corporation
Mai Ngoclan
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