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Abstract

Provided is a movable hearth furnace for thoroughly removing alkali metal elements and producing high-strength reduced iron when producing reduced iron using iron production dust containing alkali metal elements in a movable hearth furnace. The movable hearth furnace comprises: a reduction zone for heating and reducing a carbon composite briquette (C) to produce a reduced briquette (D) having an iron metallization rate of 80% or greater; an alkali removal zone, disposed after the reduction zone, for heating the reduced briquette in a reducing atmosphere and removing the alkali metal elements from the reduced briquette to obtain an alkali-free reduced briquette; and a strengthening zone, disposed after the alkali removal zone, for heating the alkali-free reduced briquette in an oxidizing atmosphere and raising the crushing strength of the alkali-free reduced briquette to produce reduced iron product.

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First Claim