US 4,498,633 AGranted

Apparatus for processing coal

AssigneeWilliams Patent Crusher and Pulverizer Company

InventorRobert M. Williams

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Abstract

Apparatus for processing coal to prevent the creation of extreme fines and to extract pyrites from the principal coal fractions in which there are two air circulating circuits having processing components which cooperate in their respective circuits to result initially in substantial extraction of fines in the first circuit while releasing principal granulated coal fractions and pyrites to the second circuit where specific gravity separation of the pyrites and principal coal fractions occur. The apparatus includes a source of drying heat added to the air moving in the circuits and delivered at the places where surface moisture drying is most effective. Furthermore, the apparatus is operated so as to reduce coal to a desired size without creating an excessive volume of extreme fines, to separate pyrites and hard to grind components by specific gravity in a region where fines are not present, and to use the extreme fines as a source of fuel to generate drying heat.

Claims7

Dependent claims

An apparatus for processing coal to extract pyrites which are present in coal, the combination which comprises:

(a) a first coal and air moving circuit containing an impact mill for reducing coal and pyrites into fractions consisting of fines, principal coal and mixed coal and pyrites, a particle size control separator, a centrifugal separator, and blower means connected in series, said blower means creating the movement of air in said first circuit for transporting the fractions of coal fines initially present in the coal and created by the reduction of the coal by said impact mill into principal coal fractions and mixed coal and pyrites;
and
(b) a second coal and air moving circuit connected to said first circuit adjacent said impact mill to receive the mixed coal and pyrite fractions reduced by said impact mill, said second circuit containing air induced specific gravity separator means, a second centrifugal separator and second blower means connected in series, said specific gravity separator means being operable to agitate the mixed coal and pyrite fraction from said impact mill, and said specific gravity separator having an outlet for further separating pyrites from the mixed coal and pyrites and said second blower means effecting the movement of coal fractions and air in said second circuit to said second centrifugal separator, whereby said specific gravity separator effects the separation of heavy pyrite fractions out of the coal fractions through said outlet.

Dependencies are inferred from the claim text.