Method for repairing a hot-blast long-time cupola furnace

Details Method for repairing a hot-blast long-time cupola furnace Method for repairing a hot-blast long-time cupola furnace

1991-08-05

1993-06-08

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Furnace lining formation or repair

264 28, 264 35, 264 36, 264 39, 264 85, 264570, 264139, 264163, 264265, 264269, 264348, 266 44, 266281, 427140, 427230, 427427, B05D 722, B28B 1122, B32B 3500, C21B 706

Patent

active

052176584

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.

REFERENCES:
patent: 936981 (1909-10-01), Bratigam
patent: 3860222 (1975-01-01), Tennenhouse
patent: 4141723 (1979-02-01), Denier et al.
patent: 4551287 (1985-11-01), Bethmann
patent: 4696421 (1987-09-01), Durr
patent: 4793595 (1988-12-01), Head et al.
patent: 4871211 (1989-10-01), Aussel
patent: 4956042 (1990-09-01), Hubert et al.

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