Method and apparatus for fractionating a mixture of particles of different sizes suspended in a liquid

Abstract From the Canadian patent

Fractionation apparatus is disclosed which utilizes a rapidly rotating disk which receives a liquid suspension of particles to be separated onto its rotating face surface. When the film of liquid and particles on the rotating face surface reaches the peripheral edge of the face, particles above a certain size are radially ejected while smaller particles and the liquid are carried over the edge onto the surface of a depending rim. The suspension of smaller particles and liquid is carried down the rim to the rim edge at which point the smaller particles and liquid are disengaged. A separator wall may be interposed between the two streams of particles emanating from the disk to provide a …