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Low-temperature oxidation behavior and mechanism of semi-dry desulfurization ash from iron ore sintering flue gas

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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 SO 2−3 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.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 51704004 and 51674002) and the Natural Science Foundation of Anhui Province (Grant No. 1808085QE133).

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Authors and Affiliations

  1. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243032, Anhui, China

    Yi-fan Wang, Yu-dong Zhang, Hong-ming Long, Li-xin Qian, Yun-fei Luo & Ru-fei Wei

  2. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, Ma’anshan, 243002, Anhui, China

    Hong-ming Long

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  1. Yi-fan Wang
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  2. Yu-dong Zhang
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Correspondence to Hong-ming Long or Ru-fei Wei.

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Wang, Yf., Zhang, Yd., Long, Hm. et al. Low-temperature oxidation behavior and mechanism of semi-dry desulfurization ash from iron ore sintering flue gas. J. Iron Steel Res. Int. 28, 1075–1081 (2021). https://doi.org/10.1007/s42243-021-00582-6

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  • DOI: https://doi.org/10.1007/s42243-021-00582-6

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