Method for removal of unburned carbon in fly ash

Abstract

The object is to remove unburned carbon in a fly ash in a stable and economically advantageous manner. A fly ash, water and a trapping agent are mixed together in a hybrid mixer (2), a shearing force is applied to the mixture to prepare a slurry containing surface-modified unburned carbon within a short time, a foaming agent is added to the slurry, and then the unburned carbon is separated by performing flotation separation in a flotator (11).

Description

technical field [0001] The present invention relates to a method for removing unburned carbon in fly ash, and particularly relates to a method for removing unburned carbon contained in fly ash discharged from coal-fired power plants and the like. Background technique [0002] Coal can be used stably over a long period of time as an energy source with confirmed recoverable reserves of more than 200 years. Therefore, the proportion of coal thermal power generation is increasing year by year, and the production of coal ash (hereinafter referred to as "fly ash") is expected to further increase in the future. [0003] Under such circumstances, it is necessary to effectively utilize fly ash in large quantities from the viewpoint of environmental protection and effective utilization of resources. [0004] At present, fly ash is used as a cement admixture after removing unburned carbon. By improving the removal rate of this unburned carbon and improving the quality of fly ash, its u...

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