The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established. Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows: 4 Au + 8 NaCN + O2 + 2 H20 = 4 NaAu(CN)2 + 4 NaOH
Gold recovery increase in CIL circuit. Various trials have shown the potential of PIONERA Bio to increase metal recovery in leaching circuits. This is especially relevant in the CIL/CIP circuits used in gold processing. The benefit of PIONERA Bio is also observed in the Merrill Crowe process.
Most cyanide leaching is carried out at a alkaline pH of between 10 and 11, depending upon lab testing of individual ores and the optimum leaching/chemical use rates. The cyanide solution strength is also important in leaching gold, with the typical range of solution being in the 0.02% -0.05% NaCN.
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Keep the ORP meter around 1,000, but do not let it drop below 400. The HCL is a chemical that steals electrons from the substances it is mixed with. It will show a reaction as long as there are electrons to steal, which is what happens when the gold is separated from the rock. At 400, the HCL stops leeching the gold.