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Why air is continuously passed through the suspension of the concentrated ore of silver during leaching with the aqueous solution of sodium cyanide ?

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In presence of air the equilibrium is shiffted in the forward direction according to the following reactions. 

Ag2S + 4NaCN ⇄ 2Na[Ag(CN)2] + Na2S ; 4Na2S + 5O2 + 2H2→ 2Na2SO4 + 4NaOH + 2S ↓

Na2S is converted to Na2SO4 and sulphur.

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