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Metallurgy — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryMetallurgy2 Marks
Question
Give the depressing agents used in the froth floatation process and why we use depressing agents in that process?
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Answer

Generally sodium cyanide and sodium carbonate are used as an depressing agents for froth floatation process. These reagents are used to selectively prevent other metal sulphides from coming to the froth. For example, when impurities such as ZnS is present in galena (PbS), sodium cyanide ( NaCN ) is added to depresses the flotation property of ZnS by forming a layer of zinc complex $Na _2\left[ Zn ( CN )_4\right]$ on the surface of zinc sulphide.

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