Method for manufacturing molten metal containing ni and cr

Details Method for manufacturing molten metal containing ni and cr Method for manufacturing molten metal containing ni and cr

C - Chemistry, Metallurgy

21

C

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C21C 5/35 (2006.01) C21B 13/00 (2006.01) C21C 5/00 (2006.01) C21C 7/068 (2006.01) C22C 33/04 (2006.01) C22C 38/40 (2006.01)

Patent

CA 2010356

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( ( H2O + CO2 )/ ( H2 + H2O + CO + CO2 )) 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 ( ( H2O + CO2 )/( H2 + H2O + CO + CO2)) at 0.3 or more.

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