Physical cleaning of high carbon fly ash

McMahan L Gray, Kenneth J Champagne, Yee Soong, Richard P Killmeyer, M Mercedes Maroto-Valer, John M Andresen, Michael V Ciocco, Paul H Zandhuis

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


An industrial fly ash sample was cleaned by three different processes, which were tribo-electrostatic separation, ultrasonic column agglomeration, and column flotation. The unburned carbon concentrates were collected at purities ranging up to 62% at recoveries of 62%. In addition, optical microscopy studies were conducted on the final carbon concentrates to determine the carbon forms (inertinite, isotropic coke and anisotropic coke) collected from these various physical-cleaning processes. The effects of the various cleaning processes on the production of different carbon forms from high carbon fly ashes will be discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)11-21
Number of pages11
JournalFuel Processing Technology
Issue number1
Publication statusPublished - 20 Apr 2002


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