C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
53/64, 53/91
C21B 13/00 (2006.01) C21C 5/35 (2006.01) C22C 38/18 (2006.01)
Patent
CA 1340922
The invention is concerned with a method of producing stainless molten steel by smelting reduction in a smelting reduction furnace provided with a bottom tuyere, a side tuyere and a top lance having a first outlet and a second outlet. The method of the invention comprises the steps of a) reducing raw chromium ore in the furnace by use of carbonaceous material to produce chromium molten metal at the bottom of the furnace and having slag, above the molten metal; b) blowing CO and/or inert gas through the bottom tuyere into the molten metal to cause agitation thereof; c) blowing CO and/or inert gas through the side tuyere into the molten metal so as to contact the agitated molten metal; d) concurrently blowing decarburizing oxygen through the first outlet of the top lance into the molten metal and post-combustion oxygen through the second outlet of the top lance into the slag, so that the molten metal is decarburized; e) reducing chromium material by maintaining a ratio of post-combustion to more than 0.3; f) discharging the slag after completion of reduction; and g) after discharging of the slag, concurrently blowing a decarburizing oxygen diluted with an inert gas through one of the outlets of the top lance into the molten metal and blowing an inert gas through the bottom tuyere into the molten metal so as to agitate forcibly the molten metal. The invention enables one to carry out the smelting reduction at high treatment speed and the smelting reduction and decarburization in the same furnace.
597362
Inoue Shigeru
Iwasaki Katsuhiro
Kawakami Masahiro
Takahashi Kenji
Tanabe Haruyoshi
Nkk Corporation
Ogilvy Renault
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