Clayminerals usually occur at less than 2 μm in the flotation of coal,
oil-sands and base metal minerals no matter whether fine grinding is
used or not [6]. It is expected that clay mineral particles are easily
entrained into froth layers and cause high gangue entrainment in
froth flotation as a result of the fine size. Arnold and Aplan [7] found
that the addition of bentonite to tap water with MIBC