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What is the role of depressant (NaCN) in...

What is the role of depressant (NaCN) in Froth-Flotation method?

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In froth floatation process, depresent prevents the formation of froth. It is used to separate two sulphide ores by preventing the formation of froth of one sulphide ore and allowing the other to form the froth, e.g., NaCN, a depressant selectively prevents ZnS from coming in froth but allows PbS to come with the froth.
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