A specific depressant, , is introduced into a flotation tank containing a mixture of Galena () and Sphalerite (). What is the exact chemical reason this depressant facilitates their separation?

Question

A specific depressant, $NaCN$, is introduced into a flotation tank containing a mixture of Galena ($PbS$) and Sphalerite ($ZnS$). What is the exact chemical reason this depressant facilitates their separation?

Prashant Kotian · Accepted Answer

Correct answer: B. acts as a selective depressant for . It reacts with to form the stable, water-soluble coordination complex sodium tetracyanozincate(II), . Because it dissolves, it cannot float, allowing to be skimmed off in the froth.

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