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Synopsis: Limonite, produced in Hokkaido, contains arsenic. As arsenic cannot be removed during the refining process in both blast furnaces and open hearth furnaces, must be removed during the ore beneficiation process. Limonite is normally sintered after mixing with foreign ores to remove arsenic. During the process the gangue in mixed ores are considered to have some effects on the arsenic removal. In the present investigation the gangue was divided in three groups: acidic. (SiO2, TiO2), neutral (Al2O3) and basic compound (CaO, MgO), and the effect of these groups on the arsenic removal reaction was investigated. The following results were obtained:

Effect of Gangue Components of Mixed Iron Ores on the Removal of Arsenic in Limonite