The role of added sodium cyanide and alkali in the separation of galena from zinc blende and iron sulphide is

Question

The role of added sodium cyanide and alkali in the separation of galena from zinc blende and iron sulphide is (A) to activate (improve) the floating property of PbS (B) to depress the floating property of ZnS and FeS 2 (C) to act as collector of required ore (D) to dissolve away ZnS from galena

Tardigrade Admin · Accepted Answer

By depressing the floating property of ZnS and FeS 2, galena alone is carried up in the froth.

Q. The role of added sodium cyanide and alkali in the separation of galena from zinc blende and iron sulphide is

to activate (improve) the floating property of $P b S$

to depress the floating property of $Z n S$ and $F e S_{2}$

to act as collector of required ore

to dissolve away $Z n S$ from galena

By depressing the floating property of $Z n S$ and $F e S_{2},$ galena alone is carried up in the froth.

Q. The role of added sodium cyanide and alkali in the separation of galena from zinc blende and iron sulphide is

to activate (improve) the floating property of PbS

to depress the floating property of ZnS and FeS2​

to act as collector of required ore

to dissolve away ZnS from galena

By depressing the floating property of ZnS and FeS2​, galena alone is carried up in the froth.

to activate (improve) the floating property of $P b S$

to depress the floating property of $Z n S$ and $F e S_{2}$

to dissolve away $Z n S$ from galena

By depressing the floating property of $Z n S$ and $F e S_{2},$ galena alone is carried up in the froth.