C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
53/43, 39/62
C21B 13/00 (2006.01) C21B 13/14 (2006.01) C21C 5/32 (2006.01)
Patent
CA 1336542
A method for smelting and reducing iron ores comprises the steps of: the step of preheating and prereducing iron ores; the step of charging the preheated and prereduced iron ores into a smelting reduction furnace; the step of charging carbonaceous material and fluxing material into the smelting reduction furnace; the step of blowing in oxygen gas into the smelting reduction furnace through a top-blow oxygen lance having decarbonizing nozzles and post combustion nozzles; and the step of blowing in stirring gas through side and bottom tuyeres set respectively in a side wall and a bottom of the smelting reduction furnace. Furthermore, an apparatus for smelting reduction fitted for the method comprising: a preheat and prereduction furnace preheating and prereducing iron ores; a smelting reduction furnace into which iron ores, carbonaceous material and fluxing material are charged and in which the iron ores are smelted and reduced; a top-blow oxygen lance through which oxygen gas is blown in into the smelting reduction furnace, having decarbonizing nozzles and post combustion nozzles; and the smelting reduction furnace having bottom and side tuyeres built respectively in a side wall and a bottom thereof.
578419
Inoue Shigeru
Iwasaki Katsuhiro
Kawakami Masahiro
Kikuchi Ichiro
Takahashi Kenji
Nkk Corporation
Ridout & Maybee Llp
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