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Solution - What is the Role of Depressant in Froth Floatation Process? - CBSE (Arts) Class 12 - Chemistry

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 Chemistry Textbook for Class 12 Part 1 (with solutions)
Chapter 6: General Principles and Processes of Isolation of Elements
Q: 2 | Page no. 163

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Reference Material

Solution for question: What is the Role of Depressant in Froth Floatation Process? concept: null - Froth Floatation Method. For the courses CBSE (Arts), PUC Karnataka Science, CBSE (Commerce), CBSE (Science)
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