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:
Nov. 19, 1991
Filed:
Jun. 11, 1990
Hideomi Yanaka, Kawasaki, JP;
Yotaro Ohno, Kawasaki, JP;
NKK Corporation, Tokyo, JP;
Abstract
A method for manufacturing cold bonded pellets comprises the steps of mixing fine iron ore with binder and pelletizing the mixture of the fine iron ore and the binder to manufacture green pellets, charging the green pellets into a travelling grate, a layer of the green pellets which has a predetermined height being formed on the travelling grate, blowing gas containing carbon dioxide into the layer of the green pellets on the travelling grate, the green pellets being cured by the gas containing carbon dioxide, and the gas having passed through the layer of the green pelllets being discharged, and drying the curen green pellets. The gas containing carbon dioxide has a concentration of 55 vol. % carbon dioxide or more. The gas containing carbon dioxide has a concentration of 20 vol. % nitrogen or less. The gas containing carbon dioxide is blown into the green pellets layer at a flow rate of 0.1 to 1.0 Nm.sup.3 /sec. for 1 m.sup.2 of the area of the grate, Nm.sup.3 being the volume of the gas in a normal condition.