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    • Apparatus for improved ash and sulfur rejection 

      Mining and Minerals Engineering; Virginia Tech Intellectual Properties, Inc.; Yoon, Roe-Hoan; Luttrell, Gerald H. (United States Patent and Trademark Office, 1996-06-04)
      An apparatus for separating impurities from coal, includes a device for removing a predetermined amount of ash-forming substances from the coal and a device for removing a predetermined amount of high specific gravity ...