The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 1983
Filed:
Mar. 19, 1981
Applicant:
Inventor:
Jacobus Van Laar, Santpoort, NL;
Assignee:
Estel Hoogovens BV, IJmuiden, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F27D / ; C21B / ; F27D / ;
U.S. Cl.
CPC ...
432 95 ; 266197 ; 432247 ; 432252 ;
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.