Method for repairing a hot-blast long-time cupola furnace
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United States of America Patent
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Jun 8, 1993
Grant Date -
N/A
app pub date -
Aug 5, 1991
filing date -
Aug 3, 1990
priority date (Note) -
Expired
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Abstract
A method for repairing a hot-blast, long-time cupola furnace by removing residual slag and relining the cupola furnace including feeding liquid nitrogen to the cupola furnace immediately at the end of a smelting operation and simultaneously with the feeding of the liquid nitrogen, removing residual slag from the furnace. The furnace is cooled with liquid nitrogen until the furnace reaches a temperature of less than or equal to 40.degree. C. after which the furnace is relined with fresh refractory tamping compound.
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