Abstract
The elution of gold from activated carbon using supercritical carbon dioxide is reported. Results of the conditions that maximize recovery of gold are presented. The parameters that were investigated include pressure, solvating agent, ionic strength, and static mode time. Repeating short static time periods followed by dynamic periods (on the same gold-loaded carbon sample) yielded higher recoveries compared to longer static time periods. It is proposed that the desorption process is kinetically controlled. The standard deviation for the recovery process was 7.6% or better.
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