Patent ID: 7703610
Filing Date: 2010-04-27
Classification: B03B,B03D

Abstract:
1. A method for removing unburned carbon from a raw material fly ash comprising the steps of: (1) adding water to the fly ash to form a slurry; (2) applying, in the absence of a collector, a shear force to the slurry formed in step (1) with a high speed mixer to lipophilize the unburned carbon by generating activation energy on the surface of the unburned carbon by the shear force; and (3) adding a collector and a frothing agent to the slurry from step (2) whereby the collector attaches to the lipophilized unburned carbon, and performing flotation whereby the unburned carbon attached to the collector attaches to air bubbles formed during flotation and is separated from the fly ash.