Lime mud calcining using dielectric hysteresis heating
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United States of America Patent
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-
Jan 3, 1995
Grant Date -
N/A
app pub date -
May 7, 1993
filing date -
May 7, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Lime mud from kraft pulp recovery operations is processed using dielectric hysteresis heating, in a two-stage operation, in which wet lime mud first is dried then the dried lime mud is decomposed to lime and carbon dioxide. A two-zone lime mud calciner is employed in which the lime mud is conveyed horizontally, with drying being effected in the first zone and then decomposition being effected in the second zone. A co-current flow of purge air removes steam generated in the first zone and a counter-current flow of purge air removes carbon dioxide generated in the second zone.
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