Kobe Steel, Ltd.

Sunichi Mizukami

Dentaro Kaneko

Yoshio Kimura

Hiroyuki Kohama

Masaru Tamiya

A shaft furnace for reducing ores with a gas, wherein the furnace is constructed to destroy the plug-flow state of ores in or above a plug-flow zone where a reduction ratio of the ores is 50 to 70%, in order to prevent the clustering by changing the plug-flow zone into a shear-flow zone. Further, the shaft furnace for reducing ores with a gas is so constructed that a hydraulic radius R (cm) of the furnace in the reduction zone in which the reduction ratio is greater than 50% is selected to be,

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Kobe, Japan

Sunichi Mizukami