Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1975-09-30
1978-01-03
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 30, 75257, C21B 500
Patent
active
040664430
ABSTRACT:
A process of producing molten iron in a blast furnace in which the alkali loading to the blast furnace is at least about four pounds of alkali oxides per ton of hot metal produced, in which the alkali metal content in the furnace slag fluctuates widely due to repetitive accumulation and purging of alkali metals in the furnace over extended operating periods with corresponding fluctuations in the sulfur content and temperature of the molten metal, and in which the MgO content in the furnace slag is in the range of about 6 to about 18% by weight. Olivine is added to the furnace charge, preferably on a substantially continuous basis at an average rate of about 10 to about 100 pounds of olivine per ton of molten iron produced in the furnace, to effect the removal of the alkali metals from the furnace in the furnace slag and thereby stabilize the furnace operation. The olivine addition is particularly useful when the maximum alkali oxide content in the furnace slag fluctuates frequently by at least about 100% above the average alkali metal oxide content of the slag, in the absence of the olivine addition. The olivine is charged to the furnace ahead of the iron ore in the charge. The olivine addition may also be used to remove the alkali metals from the blast furnace when the cyanide content in the scrubber water fluctuates widely due to repetitive accumulation and purging of alkali metals in the furnace over extended operating periods. This process reduces the consumption of coke and other fuels in the blast furnace, increases production rates and the percentage of on-specification metal produced by the furnace, virtually eliminates furnace upsets due to alkali build-ups and improves overall furnace operation.
REFERENCES:
patent: 3966456 (1976-06-01), Ellenbaum
Andrews M. J.
International Minerals and Chemical Corporation
LandOfFree
Process of stabilizing the operation of blast furnaces for produ does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process of stabilizing the operation of blast furnaces for produ, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of stabilizing the operation of blast furnaces for produ will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-278686