MetallurgyHard
Question
Froth floatation :
Options
A.is a physical method of separating mineral from the gangue
B.is a method of concentration of ore depending on the difference in wetability of gangue and the ore particles.
C.is used for the concentration of sulphide ores
D.is a method in which impurities sink to the bottom and ore particles pass on to the surface with froth.
Solution
This method is commonly used for the concentration of the low grade sulphide ores like galena, PbS (ore of Pb) ; copper pyrites CuFeS2 (ore of copper) ; zinc blende, ZnS (ore of zinc) etc., and is based on the fact that gangue and ore particles have dIfferent degree of wettability with water and pine oil; the gangue particles are preferentially wetted by water while the ore particles are wetted by oil.
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