Process for controlling calcium in a leach operation

Details Process for controlling calcium in a leach operation Process for controlling calcium in a leach operation

1979-04-18

1982-01-26

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 7, 423 17, 423 18, 299 5, C01G 4300

Patent

active

043128394

ABSTRACT:
A method for controlling calcium, e.g. calcite, build-up in the leach solution of a uranium and/or related values recovery operation wherein the leach solution is flowed through a value bearing ore to dissolve the desired values. A soluble fluoride, e.g. sodium fluoride, is added to the leach solution after it has passed through the ore to thereby precipitate calcium fluoride from the leach solution and lower the calcium content of the leach solution. The soluble fluoride may be added to the leach solution before the leach solution passes through the process equipment which is used to remove the values from the leach solution or the soluble fluoride may be added after the leach solution passes through the process equipment. If added before, it is preferable to also add a carbonate/bicarbonate solution along with the soluble fluoride to prevent coprecipitation of uranyl/desired value fluoride or to redissolve coprecipitated fluoride back into the leach solution.

REFERENCES:
patent: 2352832 (1944-07-01), Gunderson
patent: 2806764 (1957-09-01), Bailes et al.
patent: 2873165 (1959-02-01), Bailes et al.
patent: 3205013 (1965-09-01), Miller et al.
patent: 3792903 (1974-02-01), Rhoades
patent: 3842155 (1974-10-01), Muller et al.
patent: 3891397 (1975-06-01), Fiedelman
patent: 4103963 (1978-08-01), Espenscheid et al.

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