MetallurgyHard
Question
In the froth floatation process for the purification of minerals the particles float because :
Options
A.they are light.
B.they are insoluble.
C.their surface is preferentially wetted by oil.
D.they bear an electrostatic charge.
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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