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The campaign life of a blast furnace is intimately linked to the longevity of the hearth refractories. Understanding how much refractory remains in the hearth is crucial to assessing when a blast furnace needs to be relined. A computational fluid dynamics (CFD) model was developed, using the commercial package CFX 4.4, to aid in the assessment of the refractory condition of the hearth. The model incorporates prediction of the fluid flow of molten iron, conjugate heat transfer between the meltfatcat:575mexdhjffwhieynkx6l42pcy