Gold is extracted by a hydrometallurgical pro | vedclass

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(C) Hydrometallurgy is the process of extracting a metal from its ore by dissolving the metal or its ore in a suitable chemical reagent,followed by th

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To form complexes which are water soluble

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(C) Hydrometallurgy is the process of extracting a metal from its ore by dissolving the metal or its ore in a suitable chemical reagent,followed by the recovery of the metal using a precipitating agent.Gold is extracted by leaching with a dilute solution of $NaCN$ or $KCN$ in the presence of air $(O_2)$,which acts as an oxidizing agent to form a water-soluble complex.$4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) 	o 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$The gold is then recovered from the complex by displacement using a more electropositive metal like zinc:$2[Au(CN)_2]^-(aq) + Zn(s) 	o 2Au(s) + [Zn(CN)_4]^{2-}(aq)$

Gold is extracted by a hydrometallurgical process based on its property:

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