| 摘要 |
PROBLEM TO BE SOLVED: To suppress the forming of slag even in the case of charging a large quantity of used MgO-C bricks, and as a result, a large quantity of the used MgO-C bricks can stably be used and the wearing of lining brick in a converter is restrained like the conventional way, when the used MgO-C brick is used as a substitute to dolomite, light-burnt dolomite, in the converter for steelmaking, lining MgO-quality refractory brick. SOLUTION: The used MgO-C brick is crushed and adjusted so that this brick having≤5 mm grain diameter becomes≥80 mass%. Successively, such crushed and adjusted used MgO-C brick is charged into the converter before charging molten iron 2 into the converter 4, and thereafter, the molten iron is charged to perform decarburize-refining to the molten iron. In this case, it is desirable to charge the used MgO-C brick into the converter so that the charging quantity is≥1 kg/ton of the molten iron. COPYRIGHT: (C)2006,JPO&NCIPI
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