Froth phase study of coal flotation
in a hybrid mechanical flotation column
CIM Journal, Vol. 4, No. 2, 2013
The correlations between froth recovery of coal and air recovery were investigated using
a hybrid mechanical flotation column. The particle slurry was fed onto the surface of air-water twophase
froths to carry out the tests. Froth recovery was taken as the recovery of particles into the froth
product, whereas air recovery was determined by the froth height method. The relationships between
froth recovery and air recovery were nearly linear, with greater slopes for more hydrophobic particles.
Inside the froth phase, the particles were stratified, with hydrophobic particles concentrated in the upper
region and hydrophilic particles in the lower region.