Subcritical hydrothermal oxidation of semi-dry ash from iron ore sintering flue gas desulfurization: Experimental and kinetic studies

Yifan Wang; Tao Yang; Long Ding; Rufei Wei; Lixin Qian; Hongming Long; Chunbao Charles Xu

doi:10.1016/j.wasman.2023.02.002

Author(s)

Yifan Wang
Tao Yang
Long Ding
Rufei Wei
Lixin Qian
Hongming Long

Detail(s)

Original language	English
Pages (from-to)	156-164
Journal / Publication	Waste Management
Volume	160
Online published	22 Feb 2023
Publication status	Published - 1 Apr 2023
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1016/j.wasman.2023.02.002 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85148537948&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(2e3d47e4-f860-4a6c-bd6a-7556f3b789e3).html

Abstract

Realization of low temperature and high efficiency oxidation of CaSO₃ is the key to solve the issue of ecological hazards caused by semi-dry sintering flue gas desulfurization ash. The subcritical hydrothermal technology was employed for the oxidation of CaSO₃, achieving 89.83% of CaSO₃ at 180 °C, 2 MPa for 120 min with a solid-to-liquid ratio of 1:20. The macroscopic oxidation kinetics of CaSO₃ in the subcritical hydrothermal reaction system was investigated. A mathematical model was established, incorporating the intrinsic reaction, CaSO₃ dissolution, oxygen diffusion and CaSO₄ precipitation. It was concluded that the macroscopic oxidation of CaSO₃ was co-controlled by the oxygen diffusion and CaSO₄ precipitation. Subcritical hydrothermal technology promises not only higher efficiency, but more importantly, potentially “one-step” preparation of CaSO₄ whiskers, enabling cost-effective and high value-added resource utilization of the semi-dry FGD ash. © 2023 Elsevier Ltd.

Research Area(s)

CaSO3, Iron ore sintering, Macroscopic reaction kinetics, Semi-dry desulfurization ash, Subcritical hydrothermal, Wet oxidation

Citation Format(s)

[ RIS ] [ BibTeX ]

Subcritical hydrothermal oxidation of semi-dry ash from iron ore sintering flue gas desulfurization: Experimental and kinetic studies. / Wang, Yifan; Yang, Tao; Ding, Long et al.
In: Waste Management, Vol. 160, 01.04.2023, p. 156-164.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Wang, Y, Yang, T, Ding, L, Wei, R, Qian, L, Long, H & Xu, CC 2023, 'Subcritical hydrothermal oxidation of semi-dry ash from iron ore sintering flue gas desulfurization: Experimental and kinetic studies', Waste Management, vol. 160, pp. 156-164. https://doi.org/10.1016/j.wasman.2023.02.002

Wang, Y., Yang, T., Ding, L., Wei, R., Qian, L., Long, H., & Xu, C. C. (2023). Subcritical hydrothermal oxidation of semi-dry ash from iron ore sintering flue gas desulfurization: Experimental and kinetic studies. Waste Management, 160, 156-164. https://doi.org/10.1016/j.wasman.2023.02.002

Wang Y, Yang T, Ding L, Wei R, Qian L, Long H et al. Subcritical hydrothermal oxidation of semi-dry ash from iron ore sintering flue gas desulfurization: Experimental and kinetic studies. Waste Management. 2023 Apr 1;160:156-164. Epub 2023 Feb 22. doi: 10.1016/j.wasman.2023.02.002

Wang, Yifan ; Yang, Tao ; Ding, Long et al. / Subcritical hydrothermal oxidation of semi-dry ash from iron ore sintering flue gas desulfurization : Experimental and kinetic studies. In: Waste Management. 2023 ; Vol. 160. pp. 156-164.

Subcritical hydrothermal oxidation of semi-dry ash from iron ore sintering flue gas desulfurization : Experimental and kinetic studies