Mining or in situ disintegration of hard material – In situ conversion of solid to fluid – Dissolving or chemical reaction
Patent
1983-04-14
1985-08-20
Novosad, Stephen J.
Mining or in situ disintegration of hard material
In situ conversion of solid to fluid
Dissolving or chemical reaction
299 4, 423 11, 423 15, E21B 4328
Patent
active
045360340
ABSTRACT:
This invention relates to a process for reducing to environmentally acceptable levels the amount of soluble or mobile contaminants in formations that have been subjected to in situ leaching to recover mineral values therefrom. The present process is also applicable to surface milling operations. In accordance with the present invention, an aqueous solution containing orthophosphates is introduced into the formation to immobilize contaminants by forming a relatively stable precipitate. For example, radionuclides such as uranium, thorium or radium form stable precipitates with orthophosphates.
When the formation fluids contain a high concentration of carbonates, the formation fluids are treated to reduce the carbonates concentration to levels which do not substantially interfere with the phosphate precipitation of contaminants.
REFERENCES:
patent: 4108722 (1978-08-01), Stover
patent: 4311341 (1982-01-01), DeVries et al.
patent: 4311676 (1982-01-01), Demarthe et al.
patent: 4346936 (1982-08-01), Yan
patent: 4378131 (1983-03-01), Strom
patent: 4418961 (1983-12-01), Strom et al.
Yan, "Calcium Control in In-Situ Uranium Leaching Process", 11/80, pp. 2068-2073.
Otto, Jr. John B.
Paul James M.
DelSignore Mark J.
Gilman Michael G.
Malone Charles A.
McKillop Alexander J.
Mobil Oil Corporation
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