Process for Eluting Adsorbed Gold And/or Silver Values from Activated Carbon.
U S Pat 3 935 006 1976 Jan; :
Gold and/or silver that have been adsorbed on activated carbon from a processing solution are recovered by contacting the metal-loaded activated carbon with an eluent selected from the group of: h2o- soluble alcohols, an alcohol-h2o mixture, an alcoholic solution of a strong base, an alcohol-h2o-base mixture, a water-soluble ketone, and ketone-h2o mixtures. The gold and/or silver values are readily desorbed into the eluent solution and the used activated carbon may be prepared for reuse by washing with water. e.g., an activated coconut carbon column was prepared by adsorbing au to load the column to about 400 oz au/ton of activated carbon. The eluent consists of 5 pct h2o and 95 pct absolute ethyl alcohol and 1 g/l naoh. Over 98 pct of the adsorbed gold was recovered in the eluate.
U.S. Pat. 3,935,006; Jan. 27, 1976; Chem. Abstr. 84:182,905P