Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1984-12-03
1986-03-25
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
75110, 75115, 75118R, C25C 120
Patent
active
045781630
ABSTRACT:
A process for treating refractory ores combines pressure oxidation treatment of the ore with cyanidation and carbon-in-pulp recovery. Pressure oxidation is carried out under acidic conditions, at elevated temperatures and pressure. Before cyanidation, the oxidized slurry is subjected to a multiple stage washing operation to remove excess acid and heavy metals generated during the pressure oxidation. Such heavy metal removal lowers the subsequent cyanide usage and makes the process more economical. Cyanidation is carried out in a conventional manner, and it has been found that carbon-in-pulp recovery leads to greatly enhanced recovery of gold when compared to other conventional methods, such as zinc precipitation.
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U.S. Defensive publication T104,001 Richard S. Kunter, Mar. 6, 1984 Method for Recovering Gold from Refractory Ores Appln No. 536,222.
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Davidson et al. (1979) J. S. Afr. Inst. Min. Metall. 79:281-297.
Kunter Richard S.
Turney John R.
Andrews R. L.
Homestake Mining Company
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