Methods of treating bi-modal fly ash to remove carbon

Details Methods of treating bi-modal fly ash to remove carbon Methods of treating bi-modal fly ash to remove carbon

1996-05-09

1999-03-30

Nguyen, Tuan N.

Classifying, separating, and assorting solids

Special applications

209 10, 209309, 209466, 106405, 106DIG1, B03B 900, C04B 1400

Patent

active

058877240

ABSTRACT:
A method of reducing the carbon content of a dry bi-modal fly ash includes subjecting the bi-modal fly ash to dry vibrating screen separation into a carbon rich component and a carbon depleted fly ash component with the carbon depleted fly ash component being created with a carbon content less than about 4 percent by weight and at least 50 weight percent of the fly ash component of the bi-modal fly ash. The dry vibrating screen separation is preferably a single step process with no prior substantial concentration of the carbon component of the bi-modal fly ash. It is preferred to employ bi-modal fly ash produced as a result of combustion of coal. A method of making a concrete mixture employing the carbon depleted component is also provided.

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