PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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What is the Role of Depressant in Froth Floatation Process? - PUC Karnataka Science Class 12 - Chemistry

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Question

What is the role of depressant in froth floatation process?

Solution

In the froth floatation process, the role of the depressants is to separate two sulphide ores by selectively preventing one ore from forming froth. For example, to separate two sulphide ores (ZnS and Pbs), NaCN is used as a depressant which selectively allows PbS to come with froth, but prevents ZnS from coming to froth. This happens because NaCN reacts with ZnS to form Na2[Zn(CN)4].

`4NaCN + ZnS ->Na_2[Zn(CN)4] + Na_2S`

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 12 (2015 to Current)
Chapter 6: General Principles and Processes of Isolation of Elements
Q: 2 | Page no. 163
Solution What is the Role of Depressant in Froth Floatation Process? Concept: Concentration of Ores - Froth Floatation Method.
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