Mechanism analysis of the production of sublimated sulfur in the tail gas of acidolysis of titanium concentrate

Xiang Quanjin; Quan Yuanxia; Quan Xuejun; Li Li; Wang Haibo; Chen Xinhong; Li Ping

doi:10.7513/j.issn.1004-7638.2023.03.015

Volume 44 Issue 3

Jun. 2023

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Xiang Quanjin, Quan Yuanxia, Quan Xuejun, Li Li, Wang Haibo, Chen Xinhong, Li Ping. Mechanism analysis of the production of sublimated sulfur in the tail gas of acidolysis of titanium concentrate[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 100-104. doi: 10.7513/j.issn.1004-7638.2023.03.015

Citation:

Xiang Quanjin, Quan Yuanxia, Quan Xuejun, Li Li, Wang Haibo, Chen Xinhong, Li Ping. Mechanism analysis of the production of sublimated sulfur in the tail gas of acidolysis of titanium concentrate[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 100-104. doi: 10.7513/j.issn.1004-7638.2023.03.015

Citation:

Xiang Quanjin, Quan Yuanxia, Quan Xuejun, Li Li, Wang Haibo, Chen Xinhong, Li Ping. Mechanism analysis of the production of sublimated sulfur in the tail gas of acidolysis of titanium concentrate[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(3): 100-104. doi: 10.7513/j.issn.1004-7638.2023.03.015

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Mechanism analysis of the production of sublimated sulfur in the tail gas of acidolysis of titanium concentrate

doi: 10.7513/j.issn.1004-7638.2023.03.015

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China
2.
School of Chemistry and Chemical Engineering , Chongqing University of Technology, Chongqing 400054, China
3.
Panzhihua Steel Group Chongqing Titanium Industry Co., Ltd., Chongqing 400054, China

Received Date: 2023-01-31
Publish Date: 2023-06-30

Abstract

Abstract

In order to prevent the continuous production of titanium dioxide from being blocked by sublimated sulfur in the process of titanium dioxide acidolysis by sulflate process, this paper starts from the structural composition analysis of titanium concentrate, combined with the main chemical reactions that may exist in the acidolysis process and the specific acidolysis process conditions in actual production by calculating the change of Gibbs free energy of related reactions. The potentio-pH diagram of the system under the condition of acid hydrolysis was drawn, and the mechanism of the occurrence of sublimated sulfur in the tail gas of acid hydrolysis was explored. The results show that the elemental sulfur in the tail gas of acidolysis mainly come from the pyrrhotite (FeS) in titanium concentrate. The pyrrhotite is oxidized in the complex environment of acid hydrolysis at high temperature (180～220 ℃) and high acidity (pH: −1.51～−1.47) to produce elemental sulfur, which is cooled and solidified to form sublimated sulfur after the reaction. Therefore we can start from the specific process, change the acid hydrolysis environment (change the chemical potential, reduce the environmental pH value) without reducing the acid hydrolysis rate in order to avoid or reduce the occurrence of sublimation sulfur in production, reduce the effect of sublimation sulfur on the sulfate process titanium white.
- titanium concentrate,
- acid hydrolysis,
- tail gas,
- sublimation sulfur,
- mechanism analysis

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References(14)

References

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