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If galena (PbS) is contaminated with zin...

If galena (PbS) is contaminated with zinc blende (ZnS), how can these be separated by froth-floatation?

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PbS is separated from ZnS by adding a depressant like NaCN that forms a layer of zinc complex, `Na_(2)[Zn(CN)_(4)]` on the surface of ZnS and thus prevents it from forming the froth.
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