The high temperature and high pressure desorption method is to install the gold- loaded carbon in a pressure vessel, and mix the solution with 0.4% to 1% NaOH and 0.1% NaCN (may not), at a temperature of 130 to 160 ° C, at 3.6 to 5.9 kg. Under the pressure of cm 2 , pass the gold carbon layer. Within 2 to 6 hours, the gold and silver desorption rates of gold-loaded carbon exceeded 90%. Compared with the Zade process, the pressure desorption method has a much shorter desorption time, and the desorption process also consumes less reagents than the Zade process. The equipment and process of the pressure desorption method are shown in Figure 1. The desorbed rich liquid was cooled to 90 ° C and electrolyzed into the electrolytic cell.
Figure 1 Schematic diagram of the pressure desorption equipment
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