Investigation of Al2O3 and Fe2O3 transmission and transformation during the decomposition of phosphogypsum

doi:10.1016/j.cjche.2018.09.023

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (5): 1125-1131.DOI: 10.1016/j.cjche.2018.09.023

• Chemical Engineering Thermodynamics • 上一篇下一篇

Investigation of Al₂O₃ and Fe₂O₃ transmission and transformation during the decomposition of phosphogypsum

Jie Yang¹, Bin Zhu², Liping Ma¹, Hongpan Liu³

1 Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
2 School of Environmental Science & Engineering, Huazhong University of Science & Technology, Wuhan 430074, China;
3 College of Materials and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China

收稿日期:2017-12-19 修回日期:2018-08-25 出版日期:2019-05-28 发布日期:2019-06-27
通讯作者: Liping Ma
基金资助:
Supported by the National Natural Science Foundation of China (21666016).

Investigation of Al₂O₃ and Fe₂O₃ transmission and transformation during the decomposition of phosphogypsum

Jie Yang¹, Bin Zhu², Liping Ma¹, Hongpan Liu³

1 Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
2 School of Environmental Science & Engineering, Huazhong University of Science & Technology, Wuhan 430074, China;
3 College of Materials and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China

Received:2017-12-19 Revised:2018-08-25 Online:2019-05-28 Published:2019-06-27
Contact: Liping Ma
Supported by:
Supported by the National Natural Science Foundation of China (21666016).

摘要/Abstract

摘要： Phosphogypsum (PG) is a solid waste produced in the phosphate fertilizer industry and is environmentally harmful. The decomposition of PG to recycle calcium and sulfur is a proper way to reutilize PG. Current work aims at enriching the basic theory of coal decomposition process of PG. The emphasis was laid on the exploration of impact of main impurities on the process. On the other hand, according to Reaction Module, Equilib Module, and Phase Diagram Module of FactSage, the simulation computation was done on the systems of pure gypsum mixed with coal, with or without impurities for avoiding other impurities interference. Later, possible reactions in the process were deduced. Additionally, experiments were conducted in a TG-DTA integrated thermal gravimetric analyzer and a tube furnace. The products from the experiments were characterized and analyzed to verify the accuracy of theoretical calculations. The results showed that these impurities can change the decomposition process of PG. For example, aluminum oxide was transformed to calcium sulfoaluminate, while iron oxide was transformed to dicalcium ferrite. Furthermore, the results help to further improve the basic theory of phosphogypsum decomposition.

关键词: Phosphogypsum, Reductive decomposition, Simulation calculations, Aluminum oxide, Iron oxide, Ternary diagram

Abstract: Phosphogypsum (PG) is a solid waste produced in the phosphate fertilizer industry and is environmentally harmful. The decomposition of PG to recycle calcium and sulfur is a proper way to reutilize PG. Current work aims at enriching the basic theory of coal decomposition process of PG. The emphasis was laid on the exploration of impact of main impurities on the process. On the other hand, according to Reaction Module, Equilib Module, and Phase Diagram Module of FactSage, the simulation computation was done on the systems of pure gypsum mixed with coal, with or without impurities for avoiding other impurities interference. Later, possible reactions in the process were deduced. Additionally, experiments were conducted in a TG-DTA integrated thermal gravimetric analyzer and a tube furnace. The products from the experiments were characterized and analyzed to verify the accuracy of theoretical calculations. The results showed that these impurities can change the decomposition process of PG. For example, aluminum oxide was transformed to calcium sulfoaluminate, while iron oxide was transformed to dicalcium ferrite. Furthermore, the results help to further improve the basic theory of phosphogypsum decomposition.

Key words: Phosphogypsum, Reductive decomposition, Simulation calculations, Aluminum oxide, Iron oxide, Ternary diagram

Jie Yang, Bin Zhu, Liping Ma, Hongpan Liu. Investigation of Al₂O₃ and Fe₂O₃ transmission and transformation during the decomposition of phosphogypsum[J]. 中国化学工程学报, 2019, 27(5): 1125-1131.

Jie Yang, Bin Zhu, Liping Ma, Hongpan Liu. Investigation of Al₂O₃ and Fe₂O₃ transmission and transformation during the decomposition of phosphogypsum[J]. Chinese Journal of Chemical Engineering, 2019, 27(5): 1125-1131.

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Investigation of Al₂O₃ and Fe₂O₃ transmission and transformation during the decomposition of phosphogypsum

Investigation of Al₂O₃ and Fe₂O₃ transmission and transformation during the decomposition of phosphogypsum

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