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What is the role of depressant in froth ...

What is the role of depressant in froth flotation process ?

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Sometimes, it is possible to separate two sulphide ores by adjusting proportion of oil to water or by using .depressants. For example, in case of an ore containing ZnS and Pbs, the depressant used in NaCN. It selectively prevents ZnS from coming to the froth but allows PbS to come with the froth.
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