Froth flotation process used for the concentration of sulphide ore:
(This question has multiple correct options)
A. is based on the difference in wettability of different minerals
B. uses sodium ethyl xanthate (C2H5OCS2Na
) as a collector
C. uses NaCN
as depressant in the mixture of ZnS
and PbS
when ZnS
forms soluble complex and PbS
forms froth
D. uses pine oil as frothing agent

Froth flotation is indeed a process commonly used for the concentration of sulfide ores like zinc sulfide (ZnS) and lead sulfide (PbS). Let's analyze each option:

A. Correct: Froth flotation is based on the difference in the wettability of different minerals. In this process, hydrophobic particles selectively adhere to air bubbles, forming a froth on the surface of the flotation cell, while hydrophilic particles remain in the aqueous phase.

B. Correct: Sodium ethyl xanthate (C2H5OCS2Na) is commonly used as a collector in the froth flotation process. Collectors enhance the hydrophobicity of the mineral particles, facilitating their attachment to the air bubbles.

C. Incorrect: NaCN (sodium cyanide) is not typically used as a depressant in the froth flotation of sulfide ores like ZnS and PbS. Depressants are used to prevent certain minerals from being floated. In the case of ZnS and PbS, depressants might be used to prevent flotation of gangue minerals but not typically NaCN.

D. Correct: Pine oil is commonly used as a frothing agent in froth flotation. Frothing agents help to create a stable froth that can carry the hydrophobic mineral particles to the surface of the flotation cell.

So, the correct options are A, B, and D.