Method and apparatus for heating and grinding materials
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United States of America Patent
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-
Dec 3, 1996
Grant Date -
N/A
app pub date -
Aug 24, 1994
filing date -
Aug 27, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Hot gas is introduced into a fluidised bed of granular material, for example gypsum, contained in a vessel 10 having a grinding device or mill 11 in its lower region, which may comprise grinding rollers 15 cooperating with a table 17 on the base of the vessel. The gas may be supplied through a tube 20 passing down through the vessel, while raw material is fed into the bed, preferably by a feed screw 34. The ground product is discharged from the bed by an overflow 28 which determines the level of the bed.
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