Lime mud calcining using dielectric hysteresis heating

Details Lime mud calcining using dielectric hysteresis heating Lime mud calcining using dielectric hysteresis heating

1993-05-07

1995-01-03

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 301, 162192, 423175, 423177, 423637, 219701, D21C 1104

Patent

active

053783190

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.

REFERENCES:
patent: 4910371 (1990-03-01), Brun et al.
patent: 4974503 (1990-12-01), Koch
McDonald et al., "The pulping of Wood", vol. I, 1962, pp. 548-558.

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