Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Patent
1985-11-12
1987-01-20
Yuen, Henry C.
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
432139, 432 17, 201 27, 202117, F27B 916, C10B 100
Patent
active
046377956
ABSTRACT:
Bulk materials containing volatile constituents are calcined in a two-stage process comprising a first heating stage at de-volatilizing temperature but below calcining temperature during which the material is turned over and mixed to accelerate its bulk heating rate without substantially accelerating local heating rate. The first heating stage is followed by a second heating stage at calcining temperature. A rotary hearth furnace adapted for the above process is divided into outer and inner connecting annular heating zones and has rabble means for turning over and mixing the charge in the outer zone and rabble means for transporting the charge through both zones.
REFERENCES:
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patent: 2530651 (1950-11-01), Christensen
patent: 3448012 (1969-06-01), Allred
patent: 3470068 (1969-09-01), Kemmerer, Jr. et al.
patent: 3652426 (1972-03-01), Oleszko
patent: 4149939 (1979-04-01), Solano
Docherty James P.
Solano William E.
Stubenbort Joseph W.
Salem Furnace Co.
Yuen Henry C.
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