Sulphide ore of metal are usually concentrated by froth flotation process .Which one of the following sulphide3 ores after an exception and is contrated by electrical leaching?

Options

A. Copper pyete
B. Sphalerite
C. Argenuite
D. Calcon

Answer

c

Explanation

Galena`(PbS )` , copper pyrites `(CuFeS_(2))` and sphelenite `(ZnS)` are concentreted by frotghfotation process but argentite `(Ag_(2)S)` is concentreated by chemical leaching some silver accorsnative but it is chirefly found as the sulphide colled argentite or silver glance . `Ag_(2)S` either along or in association wit other solphate e.g. those of lead copper and zine C zinc Silver obtainet from its low graw ores by leaching thenm which with a diluti solution of sodium caniyade when the silver coompounds this solv forming the soluble coplex irgenpocyanibe ion
`Ag_(2)S+4NaCn rarr 2Na[Ag(CN)_(2)] + Na_(2)S`
air is blown into the mixture oxigen the sulphide to suplhate and this makes the reversivele reaction processed comple tely to the right .THe silver is precipiated from the solution by adding some electropositive metal . Usually zinc or aluminimum :
`2[Ag(CN_(2)](aq).Zn(s)rarr [Zn(CN)_(4)]^(2)(aq) + 2Ag(s))`