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Flotation machine and process for removing impurities from coals

United States Patent

*** EXPIRED ***
5,601,703
February 11, 1997
View the Complete Patent at the US Patent & Trademark Office
The present invention is directed to a type of flotation machine that combines three separate operations in a single unit. The flotation machine is a hydraulic separator that is capable of reducing the pyrite and other mineral matter content of a coal. When the hydraulic separator is used with a flotation system, the pyrite and certain other minerals particles that may have been entrained by hydrodynamic forces associated with conventional flotation machines and/or by the attachment forces associated with the formation of microagglomerates are washed and separated from the coal.
Szymocha; Kazimierz (Edmonton, CA), Ignasiak; Boleslaw (Edmonton, CA), Pawlak; Wanda (Edmonton, CA), Kulik; Conrad (Newark, CA), Lebowitz; Howard E. (Mountain View, CA)
Electric Power Research Institute, Inc. (Palo Alto, CA)
08/ 567,191
December 5, 1995
This Invention was made with U.S. Government support under Contract No. DE-FG22-87PC79865 awarded by the Department of Energy. The Government has certain rights in this invention.