Question

Name the depressant which is used to separate ZnS and PbS ores in the froth floatation process

Answer 1

NaCN is used as a depressant... I hope I am right

Answer 2

Sodium Cyanide is the depressant that is used to separate $ZnS$ and $PbS$ ores in the froth flotation process.

• Minerals are separated from their respective ores through many processes called calcination, roasting, magnetic separation, froth flotation, etc.
• In the froth flotation method, depressant are used to separate two ores.
• In case of separation of ores such as $ZnS$ and $PbS$, a chemical compound called sodium cyanide with chemical formula $NaCN$ is used.
• The sodium cyanide reacts with $ZnS$ and forms $N a_{2}\left[Z n(C N)_{4}\right]$ and settles at the bottom.
• The other ore $PbS$ forms froth and remains at the top and later it is separated.

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