Chemistry of inorganic compounds – Miscellaneous process
Patent
1999-03-22
2000-07-11
Griffin, Steven P.
Chemistry of inorganic compounds
Miscellaneous process
75744, 75743, 423 27, 423 29, B01D 1102, B01F 100, C22B 100, C22B 300
Patent
active
060868473
ABSTRACT:
A process for treating ores or rocks is provided. The process comprises (1) combining the ores or rocks with an acid passivating agent to produce a first combination; (2) contacting the first combination with an aqueous solution comprising (a) manganate ions or source thereof and (b) a base whereby a second combination is produced; and (3) maintaining the pH of the second combination at about 11 to about 13.5. The process can also comprise (1) contacting the ores or rocks with the aqueous solution to produce a third combination; (2) contacting the third combination with an acid passivating agent to produce a fourth combination; and (3) maintaining the pH of the fourth combination at about 11 to about 13.5. The process can be used to prevent acid rock drainage of metal-bearing rocks or to produce a pretreated ore or rock which can further be contacted with a lixiviating agent such as, for example, sodium cyanide to extract metals such as, for example, gold and silver from the pretreated ore or rock.
REFERENCES:
patent: 4421724 (1983-12-01), Hunnel
patent: 4613361 (1986-09-01), Lamerant et al.
patent: 5587001 (1996-12-01), De Vries
Griffin Steven P.
Reno Foundation on behalf of the University of Nevada
Rhee Michael
University of Nevada
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