BLAST FURNACE MAIN TROUGH

摘要

PROBLEM TO BE SOLVED: To provide a blast furnace main trough and a method for structuring the blast furnace main trough controlling and preventing penetration of cracks generated in a back lining layer and capable of constructing a refractory material in a short time.

SOLUTION: The blast furnace main trough formed by constructing a refractory material inside a steel shell 40 includes a wear lining layer 10 in contact with molten iron and a back lining layer 20 provided outside the wear lining layer, wherein at least a side surface-side back lining layer out of a bottom surface-side back lining layer 22 and the side surface-side back lining layer 21 constituting the back lining layer has structure which includes (a) a wet spraying refractory material layer 21a located on the steel shell side and (b) one or more refractory material layers 21b located on the molten iron side more than the wet spraying refractory material layer and different from the wet spraying refractory material layer. The structure also includes a heat insulating layer 30 between the back lining layer and the steel shell.

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