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What Is The Role Of Zn Metal In The Extraction Of Silver?

What Is The Role Of Zn Metal In The Extraction Of Silver?

During the extraction of silver, the finely powdered silver ore is treated with a dilute KCN solution to form a cyano complex of silver.

Ag2S + 4NaCN ⇌ 2Na[Ag(CN)2 ] + Na2S

Zinc is more electropositive than silver and it displaces silver from the soluble cyanide complex.

\( 2Na[Ag(CN)_2]+Zn \to Na_2[Zn(CN)_2]+2Ag \)

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