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General Principles And Processes Of Isolation Of Elements

Question

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What is the role of depressant in froth floatation process?

Solution

The role of depressant in froth floatation process is to prevent certain type of materials from forming the froth with bubbles. 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 → Na₂[Zn(CN)₄] + Na₂S

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

What is the role of cryolite in the metallurgy of aluminium?

Why is zinc not extracted from zinc oxide through reduction using CO?

What is the role of graphite rod in the electrometallurgy of aluminium?

Predict conditions under which Al might be expected to reduce MgO.

Define the term gangue or matrix.

Define the term flux.

Deine the term slag.

Why magnesium oxide is used for the lining in steel making furnance?

Which process is generally used for the benefication of sulphide ores?

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