Anoresample ofgalena(PbS) iscontaminatedwith zinc blende (ZnS). Name o – InterviewSolution

1.	Anoresample ofgalena(PbS) iscontaminatedwith zinc blende (ZnS). Name one chemical whichcan be usedto concentrategalenaselectivelybyfrothfloatationprocess.
Answer» SOLUTION :The chemicalissodiumcyanide(NaCN).Itformsassolublezinc complex,` Na_2 [ ZN (CN)_4] `with ZnS whichgoes intosolutionandthusprevents itform formingthe froth. Underthese conditions,onlyPbSforms frothandhencecan beseparatedfrom ZnS IMPURITY.

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