| 摘要 |
PURPOSE:To execute decarbonization of molten iron and reduction of Cr2O3 in molten slag at the same time and at quick reaction velocity, by supplying lump coke having the specific size to molten slag surface except firing point by top blowing oxygen at the specific velocity at the time of adding Cr by Cr ore into the molten iron in the top and bottom blowing converter. CONSTITUTION:At the time of producing a stainless steel in the top and bottom blowing converter, the Cr ore is added in the molten slag on the molten iron surface in the converter, to contain Cr2O3 in the molten slag. Under this condition, the oxygen gas from a top blowing lance is blown at low pressure, the lump coke having 5-50mm size is charged at the position except the firing point by oxygen jet at 0.1-0.5F(kg/ton.hr) velocity to the oxygen supplying velocity F(Nm<3>/ton-hr), while bringing the oxygen into no contact with the molten iron surface. By reduction reaction of the lump coke with the Cr2O3 in the molten slag, Cr is contained in the molten slag and also by injecting the oxygen from the bottom blowing tuyere, the oxidized decarbonizing reaction of the molten iron is executed.
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