| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing sintered ore by which, even in the case where difficult-to-sinter raw materials which are difficult to sinter other than high-quality iron ore of high sinterability are used, pellet size at pelletization can be increased and not only cold permeability but also hot permeability can be improved by improving the fluidity of melt generated in the course of sintering and, as the result, reducibility after sintering and cold strength can be improved. SOLUTION: The method comprises the following steps: a step where a difficult-to-sinter first raw material for sintering is pelletized in a state free of limestone and solid fuel based raw materials to form a core pellet and then a first coating layer is formed, in a state free of the limestone and solid fuel based raw materials, using a second raw material for sintering superior in sinterability to the first raw material for sintering on the surface of the core pellet and further a second coating layer is formed using the limestone and solid fuel based raw materials on the surface of the first coating layer to form a pseudo-pellet; and a step where the pseudo-pellet is sintered. COPYRIGHT: (C)2007,JPO&INPIT
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