Recovery of iron oxide from coal fly ash

摘要: A high quality iron oxide concentrate, suitable as a feed for blast and electric reduction furnaces is recovered from pulverized coal fly ash. The magnetic portion of the ash separated treated with hot strong alkali solution which dissolves most silica alumina in ash, leaving solid residue forming precipitate an acid soluble salt aluminosilicate hydrate. are then mineral to dissolve containing at least 90 weight percent oxide.