Alloys or metallic compositions – Containing over 50 per cent metal but no base metal – Chromium containing
Patent
1990-02-06
1991-08-13
Andrews, Melvyn J.
Alloys or metallic compositions
Containing over 50 per cent metal but no base metal
Chromium containing
420 71, C22C 3000
Patent
active
050394800
ABSTRACT:
A method for manufacturing molten metal containing Ni and Cr comprises a process of smelting and reducing Ni ore, and a process of smelting and reducing Cr ore.
The process of smelting and reducing Ni ore comprises the steps of charging molten iron into a smelting reduction furnace having a top-blow oxygen lance and tuyeres for blowing stirring gas, charging Ni ore, carbonaceous material and flux into the smelting reduction furnace, blowing decarbonization oxygen and post-combustion oxygen from the top-blow oxygen lance into the smelting reduction furnace, blowing stirring gas for stirring the molten metal and slag inside the smelting reduction furnace from the tuyeres, and controlling post-combustion ratio [(H.sub.2 O+CO.sub.2)/(H.sub.2 +H.sub.2 O+CO+CO.sub.2)] at 0.3 or more.
The process of smelting and reducing said Cr ore comprises charging Cr ore, carbonaceous material and flux into the smelting reduction furnace holding the molten metal containing Ni, blowing decarbonization oxygen and post-combustion oxygen from the top-blow oxygen lance into the smelting reduction furnace, blowing stirring gas for stirring the molten metal and slag inside the smelting reduction furnace from the tuyeres, and controlling post-combustion ratio [(H.sub.2 O+CO.sub.2)/(H.sub.2 +H.sub.2 O+CO+CO.sub.2)] at 0.3 or more.
REFERENCES:
patent: 4410360 (1983-10-01), Katayama et al.
patent: 4504311 (1985-03-01), Weiner
Iwasaki Katsuhiro
Kawakami Masahiro
Takaoka Toshio
Taki Chihiro
Tanabe Haruyoshi
Andrews Melvyn J.
NKK Corporation
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