APPARATUS AND METHOD FOR PRODUCING REDUCED IRON USING ALKALI-CONTAINING IRON-MAKING DUST AS RAW MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide an apparatus and a method for producing a high strength reduced iron from which alkali-metal elements are sufficiently removed, when producing reduced iron by using iron-making dust containing alkali-metal elements in a movable hearth furnace.

SOLUTION: The movable hearth furnace 4 is provided with: a reduction zone 41 for heating and reducing carbon composite briquette C to produce a reduced briquette D having an iron-metallization rate of 80% or more; an alkali-removal zone 42 for heating the reduced briquette D in a reducing atmosphere and removing the alkali-metal elements from the reduced briquette D to obtain an alkali-free reduced briquette E; and a strengthening zone 43 for heating the alkali-free reduced briquette E in an oxidizing atmosphere and raising the crushing strength of the alkali-free reduced briquette E to produce reduced iron product F.

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