Extraction of precious metals from ores thereof

Details Extraction of precious metals from ores thereof Extraction of precious metals from ores thereof

1993-01-05

1994-06-14

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423 25, 423 27, 423 29, 423 33, C25C 100

Patent

active

053207203

ABSTRACT:
Increased efficiency of extraction of silver and gold from ore materials thereof containing active carbonaceous material is obtained by conducting the extraction in two stages. In a first stage a portion of the silver and of the gold when present is extracted in a cyanide leach solution. The leached solids residue is contacted with activated carbon so that the silver and the gold when present are adsorbed on the activated carbon at elevated temperature (most preferably at about 35.degree. C. to about 100.degree. C.). In a modification, a slurry of the ore material is treated with cyanide and the precious metal adsorbed directly from the cyanided slurry with activated carbon at elevated temperature up to about 70.degree. C.

REFERENCES:
patent: T104001 (1984-03-01), Kunter et al.
patent: 2777764 (1957-01-01), Hedley et al.
patent: 2810638 (1957-10-01), Hazen
patent: 4188208 (1980-02-01), Guay
patent: 4289532 (1981-09-01), Matson et al.
patent: 4571263 (1986-02-01), Weir et al.
patent: 4578163 (1986-03-01), Kunter et al.
patent: 4610724 (1986-09-01), Weir et al.

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