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Received August 23, 2023
Accepted August 23, 2023
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Preliminary evaluation of NaClO2 powder injection method for mercury oxidation: Bench scale experiment using iron-ore sintering flue gas
Environmental Research Department, Research Institute of Industrial Science and Technology, Hyoja Dong, Pohang, Gyeoungbuk 790-600, Korea
Korean Journal of Chemical Engineering, March 2011, 28(3), 808-812(5), 10.1007/s11814-010-0433-y
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Abstract
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_x000D_
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.
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References
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Byun Y, Ko KB, Cho M, Namkung W, Lee K, Shin DN, Koh DJ, Environ. Sci. Technol., 43, 5054 (2009)
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Li ZJ, Wuebbles RD, Pylawka NJ, Chem. Phys. Lett., 354(5-6), 491 (2002)
Okabe H, Photochemistry of small molecules., John Wiley & Sons, New York (1978)
Choi HK, Lee SH, Kim SS, Fuel Process. Technol., 90(1), 107 (2009)
Straube S, Hahn T, Koeser H, Appl. Catal. B: Environ., 79(3), 286 (2008)
