US Patent Number
An improved froth flotation method is provided for the removal and recovery of an ultra-fine constituent such as carbon from tailings such as fly ash. A flotation apparatus is utilized that preferably includes a slurry conditioning tank and a flotation cell. The method of the present invention comprises the improvement of utilizing a flotation reagent formulation comprising a mixture of fuel oil and petroleum sulfonate. The method broadly includes the steps of (1) producing a slurry, or solid suspension, of the material containing the constituent to be recovered by adding a preselected amount of water or other slurrying liquid; (2) adding the flotation reagent comprising a mixture of fuel oil and petroleum sulfonate to the slurry that renders the selected constituent hydrophobic; (3) aerating the conditioned slurry; (4) recovering the selected ultra-fine constituent from an upper portion of the flotation apparatus; and (5) withdrawing and recovering tailings from a lower portion of the flotation apparatus.
University of Kentucky Research Foundation, Lexington, Ky.
Groppo, John and Brooks, Steven M., "Method of Removing Carbon from Fly Ash" (1995). Center for Applied Energy Research Faculty Patents. 28.