In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are:

Engineering

Chemistry

Hydrometallurgy and Leaching

Extraction of Gold Silver Aluminium

Question

In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are:

HNO₃ and Zn dust respectively

O₂ and Zn dust respectively

O₂ and CO respectively

HNO₃ and CO respectively

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Ag₂S + 4NaCN $\underset{}{⇌}$ Na₂S + 2Na[Ag(CN)₂]

4Na₂S + 5O₂ (O.A.) + 2H₂O $\to_{}^{}$ 2Na₂SO₄ + 4NaOH + 2S

2Na[Ag(CN)₂] + Zn (R.A.) $\to_{}^{}$ Na₂[Zn(CN)₄] + 2Ag