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

What is the role of depressant in froth floatation process?

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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`

Concept: Types of Separation Or Concentration of an Ore - Froth Floatation Method
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NCERT Class 12 Chemistry Textbook
Chapter 6 General Principles and Processes of Isolation of Elements
Q 2 | Page 163
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