(under subclass 163) Methods and means wherein oil which has a selective affinity for some of the components of the mixture to be separated is employed, to which such components adhere and with which they are floated to the surface of the bath of liquid.
(1) Note. This subclass includes cases in which sufficient bulk of oil is employed to reduce the specific gravity of the mixture of oil and adhering particles of material to a degree below that of the liquid in which the separation is effected so that the oily mixture may float.
