Shaft furnace, particularly the refractory construction of the b

Details Shaft furnace, particularly the refractory construction of the b Shaft furnace, particularly the refractory construction of the b

1981-03-19

1983-02-01

Camby, John J.

Heating

Shaft type

266197, 432247, 432252, F27D 108, C21B 708, F27D 114

Patent

active

043713343

ABSTRACT:
The refractory bottom of a shaft furnace, e.g. a blast furnace has a graphite layer, above it an intermediate layer of lower coefficient of thermal conductivity (.lambda.-value) and above the intermediate layer a third layer of yet lower .lambda.-value. To control the penetration of molten metal into the bottom and in particular to achieve a stable location of the solidification isotherm in the intermediate layer, the material of the intermediate layer is one having a .lambda.-value of 12 to 30 kcal/m.h. .degree.C. This material may be semi-graphite. Such material does not undergo a change of .lambda.-value when permeated by the molten metal.

REFERENCES:
patent: 2423898 (1947-07-01), McLain
patent: 3752638 (1973-08-01), Van Larr et al.
patent: 4004791 (1977-01-01), Saunders et al.

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