Classification and froth flotation of fly ash for producing high-quality pozzolan

J. G. Groppo, T. L. Robl, W. M. Lewis, C. J. McCormick

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The combination of froth flotation and hydraulic classification can facilitate the production of a high-quality pozzolan that meets or exceeds ASTM specifications. This combination has been rigorously evaluated and results of pilot-scale testing are presented. Pilot-scale testing was conducted on fly ash from two active electric utility storage ponds. The tests demonstrated that a high-quality and consistent pozzolan could be produced using Advanced Pozzolan Technologies' Fast Float™ Process. Along with the pozzolan, the additional production of aggregate for masonry mortar and the production of a low sulfur, medium-Btu fuel were also demonstrated. The Fast Float™ Process incorporates several simple unit processes to ensure pozzolan consistency. Classification controls the particle size distribution, which is critical for achieving early strength; flotation controls the grade with respect to L.O.I.; and dewatering controls the moisture content.

Original languageEnglish
Article number98-096
Pages (from-to)34-36
Number of pages3
JournalMinerals and Metallurgical Processing
Issue number3
StatePublished - Aug 1999


  • Classification
  • Flotation
  • Fly ash
  • Pozzolan

ASJC Scopus subject areas

  • Control and Systems Engineering
  • General Chemistry
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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