Method of making a mineral filler from fly ash

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter

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106405, 106461, 106466, 106481, 106483, 106484, 106DIG1, 209 2, 209 11, 428403, B32B 516, B03B 102, C04B 1404, C09C 128

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061399604

ABSTRACT:
A method for producing a mineral filler from fly ash is provided in which fly ash is dry processed in an air classifier to obtain a fine fraction having an average particle size of from about 0.1 to 5 microns. The fine fraction is then preferably passed through a magnetic separator to remove ferrous iron oxides and may optionally be treated with a surface modifier. The resulting processed fly ash may be used in a wide variety of filler applications.

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