Howdoweseparate twosulphideoresbyFrothFloatationMethod ?Explainwithane – InterviewSolution

1.	Howdoweseparate twosulphideoresbyFrothFloatationMethod ?Explainwithanexample.
Answer» Solution : Twosulphideorescan beseparated byadjustingproportion ofoiltowateror byusingdepressantswhichpreventonetypeofsulphide oreparticlesfromformingthefrothwithairbubbles. Forexamples, incaseofanorecontaining ZnS andPbS,thedepressantNaCN is used.Itformssolublecomplex withZnS, `4 NaCN+ZnS tounderset ("(solublecomplex)") underset ("Sod. tetracynozincate (II)")(Na_ 2 [ZN (CN)_4])+Na_ 2S` andthuspreventsit fromformingafrothwhilePbs formsthefrothandhencecan beseparatedfromZnS.

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