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US 5,817,230 AGranted
Method for improving the pozzolanic character of fly ash
AssigneeUniversity of Kentucky Research Foundation
InventorsJohn G. Groppo, Jr., Thomas L. Robl, Charles J. McCormick
Life of this patent
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Abstract
A method for improving the pozzolanic character of fly ash includes the steps of first hydraulically classifying and then flotation separating the fly ash in order to reduce particle size distribution and remove carbon. The method also includes the steps of spiral concentrating separated coarse particles to recover iron, pyrite and marcasite and screening the fly ash to remove ultra-light carbon and plant debris.
Claims6
A method for improving pozzolanic character of fly ash, comprising:
- hydraulically classifying said fly ash in order to substantially remove coarse particles greater than 75 microns;
- and
- subjecting fine particles from the hydraulic classifying to flotation to remove remaining carbon as a float fraction from a substantially carbon free fly ash having an improved pozzolanic character.
A method for improving pozzolanic character of fly ash, comprising:
- hydraulically classifying said fly ash in order to substantially remove coarse particles greater than 45 microns;
- and
- subjecting fine particles of fly ash from the hydraulic classifying to flotation to remove remaining carbon as a float fraction from a substantially carbon free fly ash having improved pozzolanic character.
Dependencies are inferred from the claim text.