1 School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, Anhui, China;
2 Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, Ma’anshan 243002, Anhui, China
Low-temperature oxidation behavior and mechanism of semi-dry desulfurization ash from iron ore sintering flue gas
1 School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, Anhui, China;
2 Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, Ma’anshan 243002, Anhui, China
摘要 The low-temperature wet oxidation behavior of semi-dry desulfurization ash from iron ore sintering flue gas in ammonium citrate solution was investigated for efficiently utilizing the low-quality desulfurization ash. The effects of the ammonium citrate concentration, oxidation temperature, solid/liquid ratio, and oxidation time on the wet oxidation behavior of desulfurization ash were studied. Simultaneously, the oxidation mechanism of desulfurization ash was revealed by means of X-ray diffraction, Zeta electric resistance, and X-ray photoelectron spectroscopy (XPS) analysis. Under the optimal conditions with ammonium citrate, the oxidation ratio of CaSO3 was up to the maximum value (98.49%), while that of CaSO3 was only 8.92% without ammonium citrate. Zeta electric resistance and XPS results indicate that the dissolution process of CaSO3 could be significantly promoted by complexation derived from the ammonium citrate hydrolysis. As a result, the oxidation process of CaSO3 was transformed from particle oxidation to SO32- ion oxidation, realizing the rapid transformation of desulfurization ash from CaSO3 to CaSO4 at low temperature. It provides a reference for the application of semi-dry desulfurization ash and contributes to sustainable management for semi-dry desulfurization ash.
Abstract：The low-temperature wet oxidation behavior of semi-dry desulfurization ash from iron ore sintering flue gas in ammonium citrate solution was investigated for efficiently utilizing the low-quality desulfurization ash. The effects of the ammonium citrate concentration, oxidation temperature, solid/liquid ratio, and oxidation time on the wet oxidation behavior of desulfurization ash were studied. Simultaneously, the oxidation mechanism of desulfurization ash was revealed by means of X-ray diffraction, Zeta electric resistance, and X-ray photoelectron spectroscopy (XPS) analysis. Under the optimal conditions with ammonium citrate, the oxidation ratio of CaSO3 was up to the maximum value (98.49%), while that of CaSO3 was only 8.92% without ammonium citrate. Zeta electric resistance and XPS results indicate that the dissolution process of CaSO3 could be significantly promoted by complexation derived from the ammonium citrate hydrolysis. As a result, the oxidation process of CaSO3 was transformed from particle oxidation to SO32- ion oxidation, realizing the rapid transformation of desulfurization ash from CaSO3 to CaSO4 at low temperature. It provides a reference for the application of semi-dry desulfurization ash and contributes to sustainable management for semi-dry desulfurization ash.
Yi-fan Wang,Yu-dong Zhang,Hong-ming Long, et al. Low-temperature oxidation behavior and mechanism of semi-dry desulfurization ash from iron ore sintering flue gas[J]. Journal of Iron and Steel Research International, 2021, 28(9): 1075-1081.
2021, Vol. 28 
