The injection of powdered sodium chlorite (NaClO2(s)) for mercury oxidation into iron-ore sintering flue gas has been evaluated by using the bench scale of tubular flow reactor, where the flow rate and temperature of flue gas stream were controlled to 250 Nm3 hr.1 and 135 ℃, respectively, and either 50 or 260 μg Nm.3 of the mercury concentration was introduced intentionally to the gas stream. We have observed that 90% of Hg0 oxidation was obtained at 0.18 g Nm.3 NaClO2(s) injection, indicating that the oxidized weight of Hg0 by the loaded weight of NaClO2(s) is 1026 (±333) (μg-Hg0) (g-NaClO2(s)).1. This result leads us to suggest that the simple injection of NaClO2(s) into the flue gas has the potential to achieve over 90% mercury control in practical application.