Two-stage uranium in situ leaching process

Details Two-stage uranium in situ leaching process Two-stage uranium in situ leaching process

1980-08-25

1983-03-08

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

299 4, C22B 6002, C01G 4300, E21B 4328

Patent

active

043760988

ABSTRACT:
A two-stage in situ uranium leaching process is described wherein H.sub.2 SO.sub.4 /oxidant is used as the principal leaching solution. Prior to leaching, the formation is treated with a dilute solution of hydrochloric acid, carbonic acid, or other acid (without oxidant) capable of removing the most accessible portions of CaCO.sub.3. The pretreatment improves the permeability of the formation and precludes plugging with CaSO.sub.4. The invention is particularly advantageous when applied to ores which cannot readily be leached with alkaline solutions.

REFERENCES:
patent: 3025131 (1962-03-01), Lerner
patent: 3915499 (1975-09-01), Mallon et al.
patent: 4043599 (1977-08-01), Lingane et al.
patent: 4105253 (1978-08-01), Showalter
patent: 4214791 (1980-07-01), Moore
Merritt, Robert C., "The Extractive Metallurgy of Uranium", 1971, pp. 63, 111, 117 and 118.

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