| 摘要 |
[PROBLEMS] It is an object to provide a reduced iron discharging screw conveyer of a rotary hearth furnace, which can reduce maintenance frequency of the screw conveyer and improve operation rates of the rotary hearth furnace by extending wear life of a screw blade of the screw conveyer. [SOLVING MEANS] A reduced iron discharging screw conveyer 5 which is provided in a rotary hearth furnace and discharges reduced iron out of the rotary hearth furnace, the rotary hearth furnace producing 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 theta of the screw blade 5a satisfies a condition of "0.46 rad<=theta<=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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