In froth-floatation process, what is the depressant used in the separation of sulphide ores of zinc and lead?

Question

In froth-floatation process, what is the depressant used in the separation of sulphide ores of zinc and lead? (A) NaCl (B) Na 2 CO 3 (C) NaCN (D) Na 2 SO 4

Tardigrade Admin · Accepted Answer

In froth-floatation process, depressants help to separate two sulphide ores by selective prevention of froth formation by one ore and allowing the other to come into froth.

For example, in order to separate two sulphide ores

(Z n S

and

P b S), N a CN

is used as a depressant. It selectively allows

P b S

to form the froth, but prevents

Z n

S from coming to froth. This happens due to the fact that

N a CN

reacts with

Z n S

to form

N a_{2} [Z n (CN)_{4}]

4 N a CN + Z n S ⟶ N a_{2} [Z n (CN)_{4}] + N a_{2} S

Q. In froth-floatation process, what is the depressant used in the separation of sulphide ores of zinc and lead?

$N a Cl$

$N a_{2} C O_{3}$

$N a CN$

$N a_{2} S O_{4}$

Q. In froth-floatation process, what is the depressant used in the separation of sulphide ores of zinc and lead?

NaCl

Na2​CO3​

NaCN

Na2​SO4​

$N a Cl$

$N a_{2} C O_{3}$

$N a CN$

$N a_{2} S O_{4}$