Uranium value leaching with ammonium carbonate and/or bicarbonat

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Radioactive metal

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423 3, C22B 6002

Patent

active

044055676

ABSTRACT:
In accordance with the present invention, uranium values are extracted from solid materials containing uranium in lower valence states than its hexavalent state comprising contacting the solid materials containing uranium with an alkaline leach solution containing the ionic species NH.sub.4.sup.+ and NO.sub.3.sup.- in an amount sufficient to convert at least a portion of the uranium in valence states lower than its hexavalent state to its hexavalent state. In another embodiment of the present invention, the aqueous alkaline leach solution is an aqueous solution of a carbonate selected from the group consisting of ammonium carbonate, ammonium bicarbonate and mixtures thereof. In a further embodiment, ionic species NO.sub.3.sup.31 is supplied by an alkaline nitrate. In yet another embodiment of the present invention, the aqueous alkaline leach solution additionally contains at least one catalytic compound of a metal selected from the group consisting of copper, cobalt iron nickel, chromium and mixtures thereof adapted to assure the presence of the ionic species Cu.sup.++, Co.sup.++, Fe.sup.+++, Ni.sup.++, Cr.sup.+++ and mixtures thereof, respectively, is present during the contacting of the solid materials containing uranium with the aqueous alkaline leach solution in an amount sufficient to catalyze the oxidation of at least a part of the uranium in valence states lower than its hexavalent state to its hexavalent state.

REFERENCES:
patent: 3036881 (1962-05-01), Clifford
patent: 3792903 (1974-02-01), Rhoades
patent: 3860289 (1975-01-01), Learmont
Merritt, Robert C. "The Extractive Metallurgy of Uranium" Colorado School of Mines Research Institute 1971, pp. 83-84, 98-112.

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