US Patent Number
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.
University of Kentucky Research Foundation, Lexington, Ky.
Groppo, John G. Jr.; Robl, Thomas L.; and McCormick, Charles J., "Method for Improving the Pozzolanic Character of Fly Ash" (1998). Center for Applied Energy Research Faculty Patents. Paper 31.