A gas-sparged hydrocyclone apparatus and method for achieving separation by flotation in a centrifugal field. Hydrocyclone apparatus includes a vessel (52) with feed means (55), product discharge means (57) and sink discharge means (68) for unwanted material. A gas phase is dispersed into the vessel through a porous wall (60) to form discrete bubbles and achieve flotation separation within the centrifugal field generated in the vessel.
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