MetallurgyEasy
Question
In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
Options
A.O2 and CO respectively
B.O2 and Zn dust respectively
C.HNO3 and Zn dust respectively
D.HNO3 and CO respectively
Solution
The reactions involved in cyanide extraction process are:
Ag2S + 4NaCN → 2Na [Ag(CN)2] + Na2S
(arg entite ore)
4Na2S + 5 [O2] + 2H2O → 2Na2SO4 + 4NaOH + 2S
(oxidi sin g agent)
2Na [Ag(CN)2] + Zn → Na2 [Zn(CN)4]+ 2Ag ↓
(reducing agent)
Ag2S + 4NaCN → 2Na [Ag(CN)2] + Na2S
(arg entite ore)
4Na2S + 5 [O2] + 2H2O → 2Na2SO4 + 4NaOH + 2S
(oxidi sin g agent)
2Na [Ag(CN)2] + Zn → Na2 [Zn(CN)4]+ 2Ag ↓
(reducing agent)
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