Heat treatment of lime sludge
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United States of America Patent
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Jan 27, 1998
Grant Date -
N/A
app pub date -
Sep 17, 1996
filing date -
Mar 22, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
A method and plant for heat treatment of lime sludge (CaCO.sub.3) formed by the causticizing process during the manufacture of paper pulp. The lime sludge is dried and pulverized in a first process stage and preheated in a second process stage by means of hot exhaust gas coming from a kiln. In order to ensure that the temperature in the second process stage does not exceed a predetermined temperature lying within the range from 400.degree.-600.degree. C., the relationship between the amount of energy available in the exhaust gas for preheating in the second process stage and the amount of accumulated energy in the material which is to be preheated is regulated.
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