Patent ID: 6514421
Filing Date: 2003-02-04
Classification: B01D,B04B

Abstract:
A method for separating a liquid-solid slurry in a rotating centrifuge having a separation area, the separation area including a first section having an inside surface and a second section, at least a portion of the first section having a wear resistant screen portion and the second section having a wire screen portion, the method comprising the steps of:delivering the slurry to the first section of the separation area in a series of streams; smoothening out the streams of slurry into an evenly distributed sheet of slurry on the inside surface of the first section through engagement with the wear resistant screen portion of the first section; performing bulk filtration of the liquid phase of the slurry in the first section of the separation area so that a solid phase is retained on the inside surface of the first section; conveying the solid phase of the slurry retained on the inside surface of the first section to the second section; and performing additional filtration of liquid from the solid phase in the second section of the separation area, wherein the wear resistant screen portion of the first section defines a plurality of slots that fall within a first size range, the wire screen portion of the second section defines a plurality of channels that fall within second size range, and the second size range is larger than the first size range.