Experimental studies on reduction desulfurization of FGD gypsum from iron ore sintering process using CO/H<sub>2</sub>

Zuo Dawen; Gong Lei; Wei Jie; Deng Bo; Shao Xing; Yang Shishan

doi:10.7513/j.issn.1004-7638.2021.01.014

Volume 42 Issue 1

Feb. 2021

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Zuo Dawen, Gong Lei, Wei Jie, Deng Bo, Shao Xing, Yang Shishan. Experimental studies on reduction desulfurization of FGD gypsum from iron ore sintering process using CO/H2[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 83-92. doi: 10.7513/j.issn.1004-7638.2021.01.014

Citation:

Zuo Dawen, Gong Lei, Wei Jie, Deng Bo, Shao Xing, Yang Shishan. Experimental studies on reduction desulfurization of FGD gypsum from iron ore sintering process using CO/H₂[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 83-92. doi: 10.7513/j.issn.1004-7638.2021.01.014

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Experimental studies on reduction desulfurization of FGD gypsum from iron ore sintering process using CO/H₂

doi: 10.7513/j.issn.1004-7638.2021.01.014

Zuo Dawen^1
,,
Gong Lei²,
Wei Jie¹,
Deng Bo¹,
Shao Xing¹,
Yang Shishan^{1
,
,}

1.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Department of Energy and Environmental Protection, Ningbo Iron and Steel Co., Ltd., Ningbo 315807, Zhejiang, China

Received Date: 2020-11-25
Publish Date: 2021-02-10

Abstract

Abstract

The thermodynamic equilibrium of CO/H₂ reduction of CaSO₄ was calculated through software FactSage 7.3. The optimum theoretical conditions for generation of CaO and SO₂ by CO/H₂ reduction of CaSO₄ were obtained at more than 1100 ℃ of reaction temperature and mole ratio of n(CO)∶n(CaSO₄)=1 or n(H₂)∶n(CaSO₄)=1. The reduction agent with a too high or too low mole ratio (n(CO)∶n(CaSO₄) or n(H₂)∶n(CaSO₄)) is not beneficial to the reduction desulfurization of CaSO₄. A higher temperature is favorable for the CO/H₂ reduction desulfurization of CaSO₄. According to the thermodynamic calculation results, experimental studies on reduction desulfurization of FGD gypsum from iron ore sintering process were carried out using CO/H₂+N₂ mixture gas in a furnace, and the influences of CO/H₂ concentration, reaction temperature, reaction time and gas flow rate on the reduction desulfurization of FGD gypsum by CO/H₂ were studied. The results show that the beneficial conditions for CO reduction desulfurization of FGD gypsum are CO concentration of 5%, temperature of 1050 ℃ for 30 min and gas flow rate of 5 L/min. The beneficial conditions for H₂ reduction desulfurization are H₂ concentration of 8%, temperature of 1050 ℃ for 30 min and gas flow rate of 5 L/min. The efficiency of reduction desulfurization by CO is better than that by H₂. During the reduction process, FGD gypsum sinters above 900 ℃ and it makes a notable impact on the reduction desulfurization of the FGD gypsum.
- sintering,
- flue gas,
- desulfurization gypsum,
- reduction desulfurization,
- CO,
- H₂,
- desulfurization ratio

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References(12)

References

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