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:
Oct. 05, 1976
Filed:
Jan. 21, 1976
Aldo Ramacciotti, Rome, IT;
Centro Sperimentale Metallurgico S.p.A., Rome, IT;
Abstract
A process for the two-stage reduction of iron ore in a rotary kiln, which is an improvement on U.S. Pat. No. 3,833,355. A layer of reducing agent such as coke is held against the side wall of a reactor that rotates about its vertical axis, by centrifugal force and its own friction. The next inner layer is a layer of iron ore. The improvement over the earlier patent is that reduction is conducted in two stages comprising a first relatively low temperature stage of 1 to 4 hours at 700.degree. to 1100.degree.C., which does not melt the ore, and a second relatively high temperature stage of 0.5 to 1.5 hours at 1450.degree. to 1550.degree.C., with removal of the reduced carburized liquid iron from the bottom of the reactor during the second stage.