Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1987-12-18
1989-07-04
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C21B 500
Patent
active
048447374
ABSTRACT:
A method for operating a blast furnace, comprising the steps: charging iron ores and cokes through a furnace top into the blast furnace; blowing in gas containing 40 vol. % or more oxygen together with pulverized coal through tuyeres into the blast furnance; and controlling a fuel ratio within a range of 500 to 930 kg/ton., molten pig iron and still a ratio of the pulverized coal blown in through the tuyeres within a range satisfying the formula: ##EQU1## molten pig iron, where X represents a fuel ratio. Through blown-in inlets set in the furnace shaft, preheating gas is blown in to preheat burdens. The cokes charged into the blast furnace are cokes of low strength having a drum index of DI.sub.15.sup.30 of 80 to 90% .
REFERENCES:
patent: 2593257 (1952-04-01), Bradley et al.
patent: 3460934 (1969-08-01), Kelmar
patent: 3814404 (1974-06-01), Claflin
patent: 4198228 (1980-04-01), Jordan
Steel in the USSR, vol. 16, No. 10, Oct. 1986, pp. 506-508, London, GB; A. I. Strelets et al: "Assessing Effectiveness of Using Pulverized Coal in Blast Furnaces With Aid of ES Computer".
Steel in the USSR, vol. 11, No. 1, Jan. 1981, pp. 1-5, London, GB; A. N. Ramm: "Use of Combined Blast in Blast Furnance Operation".
Kawada Hitoshi
Matsuura Masahiro
Miyamoto Takehiko
Oono Yotaro
Saito Hiroshi
Andrews Melvyn J.
Nippon Kokan Kabushiki Kaisha
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