Metallurgical apparatus – Means for treating ores or for extracting metals – By means applying heat to work – e.g. – furnace
Reexamination Certificate
2007-04-03
2010-02-02
Kastler, Scott (Department: 1793)
Metallurgical apparatus
Means for treating ores or for extracting metals
By means applying heat to work, e.g., furnace
C266S176000
Reexamination Certificate
active
07655181
ABSTRACT:
A reduced iron discharging screw conveyer is provided in a rotary hearth furnace and discharges reduced iron out of the rotary hearth furnace. The rotary hearth furnace produces the reduced iron by charging and heating a pellet including metallic oxide and coal material onto a rotary hearth rotating in a horizontal plane. The reduced iron discharging screw conveyer has a rotary shaft and a screw blade which is spirally formed on an outer surface of the rotary shaft. A lead angle θ of the screw blade5asatisfies a condition of “0.46 rad ≦θ≦0.79 rad”. A ratio (h/D) between height h of the screw blade and an outer diameter D of the screw conveyer is smaller than 0.2, and a ratio (t/h) between thickness t and height h of the screw blade is larger than or equal to 0.12.
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International Search Report issued Jul. 10, 2007 in the International (PCT) Application of which the present application is the U.S. National Stage.
International Preliminary Report on Patentability issued Nov. 27, 2008 in International Application No. PCT/JP 2007/057442.
Nagatomi Masahide
Nakayama Toshitaka
Shima Shinji
Kastler Scott
Nippon Steel Engineering Co., Ltd.
Nittetsu Plant Designing Corporation
Wenderoth , Lind & Ponack, L.L.P.
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