Processes for extraction of uranium and radium from uranium-cont

Details Processes for extraction of uranium and radium from uranium-cont Processes for extraction of uranium and radium from uranium-cont

1984-04-13

1987-03-10

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 2, 423 3, 423 10, 423 20, C01G 4300, C01F 1300

Patent

active

046490299

ABSTRACT:
Ferric nitrate leaching at 75.degree. C. is found to remove up to 97% of the uranium and 93% of the radium from ores occurring in the Elliot Lake area of Canada, after an initial flotation-separation of the sulfide minerals from the ore. In processes of the invention an aqueous acidic ferric nitrate solution of relatively low concentration, e.g. 0.01M to 0.1M is used, giving tailings which are effectively sulfide-free (less than 0.45 wt %) and with radium levels approaching a desired maximum value of 24 pCi/g. Radium may be removed from the leachate by adsorption and uranium by solvent extraction. 80-87% of the ferric nitrate may be recirculated for further leaching. Because of the low reagent concentrations and the recycle of the ferric nitrate, it is possible to keep nitrate ion levels in the effluent below the prescribed level of 10 ppm.

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patent: 4374096 (1983-02-01), Skeaff
patent: 4431609 (1984-02-01), Scheitlin
patent: 4454097 (1984-06-01), Nirdosh et al.

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