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. 15, 2011
Filed:
Sep. 15, 2006
Shinji Shima, Kitakyushu, JP;
Toshitaka Nakayama, Kitakyushu, JP;
Tomoaki Shibata, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Nippon Steel Engineering Co., Ltd., Tokyo, JP;
Abstract
The present invention discovers a new structural design technique which provides clearances between refractoriesand fills the clearances with various types of refractories or refractory materials like in the past and, furthermore, uses another method to secure the heat expansion absorption function and provides a hearth structure of a rotary furnace hearthable to prevent contact between the hearth structure and furnace side wallsandcaused by heat expansion of the refractoriesand realize safe and smooth operation, that is, a hearth structure of a rotary furnace hearth laying two or more layers of refractories between side blocksandbuilt at the inner circumferential end and outer circumferential end of a hearth refractory bedof a rotary furnace hearthand laying a powder or pellet hearth materialon its top surface, the hearth structure of a rotary furnace hearthcharacterized by using refractories having a compressive strength of 0.1 to 5 MPa at 800 to 1500° C. for the refractorieslaid at least at the topmost layer.