C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/126, 39/13
C22B 34/32 (2006.01) C21B 13/00 (2006.01) C21C 5/00 (2006.01) C21C 5/35 (2006.01) C22B 5/10 (2006.01) C22C 33/04 (2006.01)
Patent
CA 1338731
The invention relates to a method of smelting reduction of raw chromium ore 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 an upheaval thereof; (c) blowing CO and/or inert gas through the side tuyere into the molten metal so as to contact an upheaving portion of 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, the decarburizing oxygen being blown through the first outlet in a flow located inside the flow of post- combustion oxygen blown through the second outlet; and (e) reducing chromium material by maintaining a ratio of post-combustion to more than 0.3 and supplying raw chromium ore at a speed which results in metallic chromium of more than 4 kg/min. molten metal ton. The method according to the invention enables one to carry out the smelting reduction of raw chromium ore at high treatment speed.
596453
Inoue Shigeru
Iwasaki Katsuhiro
Kawakami Masahiro
Takahashi Kenji
Tanabe Haruyoshi
Nkk Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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