explain reason for A.G.W& suggest solutions
Answers
Answer:
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Answer:
Silver and gold are extracted by the cyanide process (Mac Arthur - Forrest process). After the preliminary crushing and concentration by froth floatation process, the ore (crushed auriferous rocks in the case of gold) is leached with dilute (0.4 - 7%) solution of sodium cyanide made alkaline by adding lime kept agitated by a current of air. Silver (or gold) pass into solution as argentocyanide (or aurocyanide).
It is based on the fact that gold/silver dissolves in dilute solution of sodium cyanide in presence of atmospheric oxygen with the formation of complex cyanide.
Reaction:
Ag
2
S+4NaCN→2Na[Ag(CN)
2
]+Na
2
S
Silver is obtained by reaction with Zn:
2Na[Ag(CN)
2
]+Zn→Na
2
[Zn(CN)
4
]+2Ag
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