Gold Desorption from Activated Carbon With Alkaline Alcohol Solutions.
Heinen-HJ; Peterson-DG; Lindstrom-RE
Ch 33 in World Mining & Metals Tech 1976 Sep; 1:551-564
Alkaline alcohol solutions were investigated by the federal Bureau of Mines for improving the desorption rate of gold and silver from metal-laden activated carbon generated in gold processing circuits. Factors affecting the desorption, such as temperature, alcohol content, type of alcohol, and alkalinity, were studied. Nearly complete metal desorption was obtained in 5 to 6 hr at 80 deg c using a solution containing about 20 vol-pct alcohol and 1 pct sodium hydroxide. Sodium sulfide was shown to be effective for selectively precipitating silver from the carbon strip solutions, thereby providing a means for producing high-purity gold by subsequent electrolysis.
Ch. 33 in World Mining & Metals Tech., V. 1, September 1976, PP. 551- 564