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The effects of hydrargyrum ions on gold cyanidation have been studied.Results show that under low cyanide concentration, gold cyanide process is controlled by CNtransfer, while at higher cyanide concentration, there forms passivation on gold surface.Therefore, chemical oxidation of gold in cyanide solution of higher concentration is controlled by surface reaction.Addition small amount of hydrargyrum ions brings about great increase in anodic dissolution rate of gold, decreases the passivation, reduces the equilibrium activated energy.