Inert gas purging during shaft furnace shut down

Details Inert gas purging during shaft furnace shut down Inert gas purging during shaft furnace shut down

1987-12-22

1989-01-03

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 72, 75 96, C22B 1500

Patent

active

047954906

ABSTRACT:
Processes for providing an inert gas protective atmosphere during shut down periods of a copper melting shaft furnace are described. Upon shut down of the furnace, liquid nitrogen is introduced into the furnace interior and forms gaseous nitrogen upon vaporization. A two-stage process is employed with the initial introduction of liquid nitrogen at a high rate to flush out all oxygen bearing atmospheres from the furnace, followed by the introduction of liquid nitrogen at a lower rate sufficient to maintain the protective nitrogen atmosphere.

REFERENCES:
patent: 3063828 (1962-11-01), Booth
patent: 3868987 (1975-03-01), Galey

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