Metallurgical apparatus – With means treating or handling gases exhausted by treating... – By separating particles from evolved gas
Patent
1990-10-17
1991-12-24
Andrews, Melvyn J.
Metallurgical apparatus
With means treating or handling gases exhausted by treating...
By separating particles from evolved gas
266172, 266175, C21C 540
Patent
active
050745301
ABSTRACT:
The invention provides an apparatus for smelting reduction of iron ore which contains (1) at least one preheat and prereduction furnace which preheats and prereduces iron ore to a prereduction degree of less than 30%; (2) a smelting reduction furnace into which the preheated and prereduced iron ore, carbonaceous material and flux are charged and in which the preheated and prereduced iron ore is reduced; and (3) a top blow oxygen lance having first nozzles for decarburization and second nozzles for post-combustion, oxygen gas being blown through the first nozzles and the second nozzles into the smelting reduction furnace. At least one side tuyere is placed in a side wall of the smelting reduction furnace and at least one bottom tuyere is placed in a bottom wall of the smelting reduction furnace for blowing a stirring gas through the at least one side tuyere and the at least one bottom tuyere into the smelting reduction furnace.
REFERENCES:
patent: 3711275 (1973-01-01), Johnsson
patent: 4504311 (1985-03-01), Weiner
patent: 4936908 (1990-06-01), Takahashi et al.
Inoue Shigeru
Iwasaki Katsuhiro
Kawakami Masahiro
Takahashi Kenji
Tanabe Haruyoshi
Andrews Melvyn J.
NKK Corporation
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