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What happens when NaCN is added in ore containing PbS and ZnS

Question

What happens when $N a CN$ is added in ore containing $P b S$ and $Z n S$ during concentration by froth floatation method?

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Levi Discussed

What happens when

N a CN

is added in ore containing

P b S

and

Z n S

during concentration by froth floatation method?

7 mins ago

Discuss this question LIVE

7 mins ago

Text solutionVerified

N a CN

is used as a depressant which selectively allows

P b S

to come with froth, but prevents

Z n S

from coming to froth. This happens because

N a CN

reacts with

Z n S

to form

N a_{2} [Z n (CN)_{4}]

4 N a CN + Z n S ⟶ N a_{2} [Z n (CN)_{4}] + N a_{2} S

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Question Text	What happens when $N a CN$ is added in ore containing $P b S$ and $Z n S$ during concentration by froth floatation method?
Answer Type	Text solution:1
Upvotes	150