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What is the role of depresents in froth ...

What is the role of depresents in froth floatation process ?

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(i) Depresent are used to prevent one type of sulphide ore particles from forming the froth with air bubbles.
(ii) Eg : In the process of separation of lead sulphide (PbS) ore from zinc sulphide (ZnS) ore, sodium cyanide is used as depresent.
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