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

Groppo, J. G. ; Lewis, W. M. ; McCormick, C. J. ; Robl, T. L.
Organization: Society for Mining, Metallurgy & Exploration
Pages: 3
Publication Date: Jan 1, 2000
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 Floatâ„¢ 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 Floatâ„¢ 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.
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