B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/190
B22C 5/18 (2006.01)
Patent
CA 1256266
METHOD OF RECLAIMING GREEN SAND ABSTRACT OF THE DISCLOSURE A method for reclaiming green sands having a wide range of moisture and temperature conditions involves processing such sands in a single reclaimer unit to produce free flowing reclaimed sand adapted to pass through a 20 mesh screen and having a temperature preferably no greater than about 120°F. The method involves effecting attrition of a batch of molding sand supplied to the reclaimer unit, applying a vacuum exhaust to the unit primarily to remove a calcined clay binder and water vapor therefrom, sensing the mean temperature of the sand, and selectively adding moisture or heat to the sand as required to produce reclaimed sand having predetermined moisture and temperature conditions allowing such sand to be immediately screened of extraneous materials and passed to a mulling device or remixer. The rate of addition of moisture, if any, and the flow of exhaust air through the unit are controlled in order to prevent condensation in the exhaust conduit and dust collection devices.
547980
Leidel Dieter S.
Meredith & Finlayson
LandOfFree
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