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General Principles And Processes of Isolation Of Elements
Question
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Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver? 

Answer

Dilute solution of NaCN and KCN is used for leaching of silver metal in the presence of air in the metallurgy of silver, for example in the following reaction

 

AgS + 4NaCN ⇌ 2Na[Ag(CN)2] + Na2SAgS + 4NaCN  ⇌  2Na[Ag(CN)2] + Na2S

 

The solution of sodium Argento cyanide combines with zinc dust and forms sodium tetra cyanozicate and precipitated silver. This precipitated silver is called spongy silver.

 

Zn+2Na[Ag(CN)2] →  Na2[Zn(CN)4] + 2AgZn + 2Na[Ag(CN)2] → Na2[Zn(CN)4] + 2Ag

 

The spongy silver is fused with potassium nitrate to obtain pure silver. Then the silver obtained is purified by an electrolytic process.

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