For iron granulation of collected dust

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PROBLEM TO BE SOLVED : To provide a method where the elution of alkaline-earth metal oxide and/or alkaline-earth metal hydroxide comprised in iron-containing collected dusts, particularly, CaO and/or Ca(OH)2as Ca2+ions is suppressed, and a granulated material having high strength is produced using the iron-containing collected dusts. SOLUTION : Regarding the method for granulating iron-containing collected dusts for iron manufacture, the iron-containing collected dusts are beforehand subjected to carbonatization treatment, alkaline-earth metal oxide and/or alkaline-earth metal hydroxide comprised in the iron-containing collected dusts is stabilized as alkaline-earth metal carbonate, so as to be precipitated, and thereafter, water is added to the iron-containing collected dusts and the other iron-containing raw material, so as to perform kneading and granulation. COPYRIGHT : (C)2008, JPO&INPIT