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US 4,457,788 AGranted
Particulate medium for fluidized bed operations
AssigneeProcedyne Corp.
InventorsHerbert K. Staffin, Robert Staffin
Life of this patent
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Abstract
This invention relates to non-abrasive, lubricative, particulate solids, e.g. graphites, lime, calcium oxides, zinc oxides and compounds of higher saturated fatty acids, particularly, stearate salts, and their methods of use as fluidized bed media for preventing clinging and related carryover problems. Preferably, fluidized bed media, selected in accordance with this invention, have a beneficial effect on subsequent process operations.
Claims7
An improved thermal treating process in a metal processing operation which prepares a workpiece for subsequent processing operations wherein the improvement comprises:
- carrying out at least one thermal treatment operation on a workpiece in a fluidized bed having a particulate lubricative non-abrasive bed medium which eliminates abrasive damage to the workpiece, minimizes interference with subsequent process operations due to particles from the particulate medium clinging to the workpiece, and lubricates the workpiece.
Dependencies are inferred from the claim text.