Heating – Shaft type – Having combustion products generated in or fed to shaft
Patent
1990-02-08
1992-05-05
Yuen, Henry C.
Heating
Shaft type
Having combustion products generated in or fed to shaft
432 97, 432 99, 110245, 110101CD, F27D 108, F23K 300
Patent
active
051102889
ABSTRACT:
A method and apparatus for thermally reclaiming used foundry sand is disclosed. The apparatus includes a vertically disposed furnace having a combustion chamber therein. A sand dispersion system supported within the combustion chamber disperses the free falling sand particles to expose the particles to a combustion supporting furnace environment. Disposed immediately below the furnace is a sand retention chamber in which the sand is accumulated. Heated air is introduced into the retention chamber to maintain the combustion supporting environment. Residual coatings remaining on the sand particles are thermally removed in the retention chamber.
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Donahue James L.
Rothschild John J.
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