Froth flotation apparatus and method.

摘要

Froth flotation apparatus for separating contaminant particles from liquid suspension stock, e.g. in the de-inking of used news print, includes a cell comprising inner (24) and outer (25) annular chambers of substantially equal depth. The inlet (40) and outlet (54) connections for the stock are located adjacent the bottoms of the two chambers to force the stock to travel through the full depth of each chamber. A baffle (27) of substantial width is provided on the top of the wall between the two chambers to spread the stock overflowing that wall into a thin film. Sparger means (30) mounted in the bottom wall (23) of the outer chamber (25), such as an explosion-type flowbox (32), is employed to aerate the stock as it is delivered to the froth flotation apparatus.