Heating – Shaft type – Having combustion products generated in or fed to shaft
Patent
1997-12-22
2000-09-19
Ferensic, Denise L.
Heating
Shaft type
Having combustion products generated in or fed to shaft
432 97, 164 5, 164456, F27D 100
Patent
active
061202843
ABSTRACT:
A method of reclaiming foundry sand by (a) providing a treatment tower having a plurality of heat conductive tubes extending across the interior of the treatment tower, the tubes being arranged in rows and staggered with respect to tubes in adjacent rows to create close spacing therebetween sufficient to permit the sand to flow continuously and non-turbulently along the contours of the exterior under the influence of gravity before dropping to the next adjacent tube to thereby again flow continuously and non-turbulently in successive sequence downwardly of the tower; (b) quiescently heating the interior tower space and tubes to a temperature in excess of 1300.degree. F. and introducing sufficient air or oxygen to permit combustion of the resin binder; and (c) feeding particulated sand to the top of the tower and tubes whereby such sand controllably flows along and through such labyrinth of tube spacings with little or no dwell on each contacted tube and in a time period of 5-15 seconds, said sand exiting from the bottom of said tower with said binder having been combusted to form a gas that is extracted from the top of the tower.
REFERENCES:
patent: 4144088 (1979-03-01), Adams
patent: 4334859 (1982-06-01), Minegishi et al.
patent: 5110288 (1992-05-01), Rothschild et al.
patent: 5165888 (1992-11-01), Rothschild et al.
patent: 5253698 (1993-10-01), Keough et al.
Good George E.
Martin Richard L.
Montrose Cameron A.
Montrose Rodney G.
Ferensic Denise L.
Ford Global Technologies Inc.
Kelley David B.
May Roger L.
Wilson Gregory A.
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