Process for the removal of mercury from precious metal-cyanide l

Details Process for the removal of mercury from precious metal-cyanide l Process for the removal of mercury from precious metal-cyanide l

1985-12-23

1988-02-23

Stoll, Robert L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iib metal

423 29, 423 37, 423 42, 423109, 75106, 75108, 75118R, 210705, C10G 1300

Patent

active

047269391

ABSTRACT:
This invention is a process for removing mercury from the desorption or cyanide liquor of a precious metal recovery, cyanide leach system. A sulfide ion-producing compound and a flocculating agent are added to the desorption liquor to form and flocculate mercuric sulfide. The desorption liquor typically has a cyanide concentration of between about 0.5 percent and about 2.0 percent by weight. The flocculated mercuric sulfide is separated from a substantially mercury-free precious metal-containing, cyanide solution.

REFERENCES:
patent: 935337 (1909-09-01), Thwaites
patent: 1198086 (1916-09-01), Vandercook
patent: 4072587 (1978-02-01), Heinen et al.
patent: 4188208 (1980-02-01), Guay
patent: 4256707 (1981-03-01), Flynn, Jr. et al.
patent: 4289532 (1981-09-01), Matson et al.

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