| 摘要 |
PURPOSE:To efficiency refine molten steel in a ladle while raising temp. by supplying exothermic agent together with stirring gas deeply in the molten steel in the ladle from a lance and blowing oxygen gas by a lance in a large submerged tube covering the molten steel surface. CONSTITUTION:The large submerged tube 1 covering substantial part of the molten steel surface is dipped in the molten steel in the ladle to form the fixed space on the above molten steel surface. On the other hand, by the bubbling lance 2 deeply dipped in the molten steel, the bubbling gas is supplied to sufficiently stir the molten steel and also the exothermic agent is supplied together with the gas. Further, in the above space, the oxygen gas is blown on the molten steel surface or into the molten steel from the oxygen lance 3 as vertically moving. By this method, the temp. of molten steel is efficiently raised. Before and after raising this temp., slag making agent is charged from charging pipe 4 and powder injection is executed from the bubbling lance 2, and the refining of the molten steel in the ladle is executed while raising the temp.
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