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:
Jan. 04, 1977
Filed:
Oct. 01, 1975
Kurt Stift, Leoben, OE;
Abstract
A method of reducing iron ores in a shaft furnace. The furnace has an enlarged lower portion which is joined to an upper portion by an intermediate portion of reduced cross-sectional area. Iron ores are introduced in the upper portion of the furnace without addition of fuel (such as coke), and hot reducing gases are produced outside the furnace through partial combustion. The hot reducing gases and carbon in powder form are introduced into the lower portion of the furnace in a generally downward direction toward the iron bath in the lower portion of the furnace, and heat produced by electric energy is supplied to the furnace lower portion. Exceptionally accurate control is provided of the amount of carbon to the iron ore is very rapid.