Not process water E/W single pass efficiency is critical for Zadra because gold not recovered is then re-circulated back to the elution column, slowing down the elution rate Eluant flowrate is not too critical in the 2-4 BV/h range You should be achieving optimum elution with about 30 BV of eluant through the column (15h at 2BV/h)
Operation of the electrowinning process differs depending on the elution procedure that is used In the case of Zadra elution, where the electrowinning cell is in series with the elution column, the column and cell must be designed to elute and recover the gold by recirculation of the eluant until the gold content of the eluted carbon is low enough (
Electrowinning and smelting are the final stages of gold production The concentrated gold solutions produced in the elution circuit (pregnant eluate and by the Sunrise Reactor, are passed through the electrowinning cells which converts the gold ions (charged gold particles) in the solution into solid gold
PDF | The ZADRA system is another elution process where gold that is adsorbed on to activated carbon is desorbed from the carbon by a reversal of the adsorption kinetics The ZADRA elution circuit .
The flexibility allowed in the design of the elution-electrowinning circuit is apparent from the fact that the elution column and the electrowinning cell were designed independently for the parameter studies, yet it was possible to combine the two into one process, while still achieving good elution and electrowinning efficienci
It then flows back into the eluate tank As the solution flows through the electrowinning cell, gold is plated on to the steel wool cathod This recirculation process continues for around 14 to 16 hours after which period of time there should be no more than ~1 g Au/tonne of eluate remaining in solution
Electrowinning Cell Process Eluates containing soluble gold and silver from either a ZADRA or an AARL type elution are suitable for recovery in the Kemix Electrowinning cell Electrowinning is a process used to recover metals (eg gold and silver) from concentrated solutions by applying a voltage across electrodes immersed in a concentrated .
Elution is the next step in the process, whereby the adsorption of the gold cyanide complex onto carbon is reversed Loaded carbon is removed from the CIL circuit and the gold stripped from the carbon using a number of treatment steps The result is a solution of high gold concentration (pregnant eluate) The gold can then be removed from the .
13 Tau Lekoa Elution and Electrowinning process description 131 Elution Circuit Figure 1 shows a flow sheet of the elution circuit The elution column operates with a 2-25% NaOH solution with a temperature range of 120oC-135oC The gold is stripped from the carbon into the solution