Recovery of Gold from Ores.
Authors
Scheiner-BJ; Lindstrom-RE
Source
U S Pat 3 764 650 1973 Oct; :
Abstract
Gold is extracted from oxidized and carbonaceous ores (65-200 mesh) by forming an aqueous slurry with a soluble chloride such as that of k, na, ca, or mg providing chloride ion in a concentration equivalent to that from 5-20 pct nacl, adjusting the ph to 0.5-1.8 With hcl, hno3, or h2so4, and bubbling ozone through it for 4-16 h at 23 deg-25 deg. C with 20-40 lb o3 consumed/ton of ore. When this was done with 100 g of ore containing 0.4 Oz au/ton and 10 g nacl in 200 ml of h2o at ph 1 by bubbling o3 for 8 h, the au recovery in solution was 95 pct. The chloride solution can be used repeatedly with o3 on more ore until the chloride concentration becomes too low.
Identifying No.
PAT 3,764,650
Source Name
U.S. Pat. 3,764,650; Oct. 9, 1973; Chem. Abstr. 80:29,439N
