Method and apparatus for calcining material containing volatile constituents
This patent describes a heating furnace for calcining a bulk material containing a volatile constituent including a stationary heated circular chamber, a wall surrounding the chamber, a hearth in the chamber, and means for rotating the hearth around its vertical axis. It also includes a roof for the chamber, a discharge opening in the center of the hearth, and transport rabbles mounted in the roof extending into the hearth for urging material on the hearth toward the discharge opening when the hearth is rotated. The improvement described here comprises means positioned intermediate the discharge opening and the chamber wall so as to divide the chamber into at least an inner and an outer connecting co-axial annular portions. A means is included in the outer portion to turn over and mix the material on the hearth in the outer portion against the direction of travel of the material and fuel burners in the dividing means.
- Assignee:
- Salem Furnace Co., Pittsburgh, PA
- Patent Number(s):
- US 4637795
- OSTI ID:
- 6863913
- Resource Relation:
- Patent File Date: Filed date 12 Nov 1985
- Country of Publication:
- United States
- Language:
- English
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