Process for regenerating used foundry sand
AssigneeKuttner GmbH & Co. KG
InventorKlaus Schott
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Abstract
The invention relates to a process for regenerating used foundry sand, whose original molding sand contained, as the molding material, inorganic binders such as, for example and especially, bentonite ("inorganic used sand") and/or organic binders such as, for example and especially, phenolic resins and/or furan resins ("organic used sand"), wherein the used sand to be reconditioned is impregnated with water and then transferred in the moist state into a heated fluidized bed.
Claims26
A process for reconditioning at least one of used organic or inorganic foundry sand formed from original molding sand which contained, as the molding material, inorganic binders in the case of inorganic used sand or organic binders in the case of organic used sand or mixtures thereof, which comprises impregnating the used sand to be reconditioned with water to such an extent as to substantially fill the pores between the grain shells of the sand with water and maintaining said impregnation of the sand until it enters a heated fluidized bed.
Dependencies are inferred from the claim text.