Thermochemical decomposition of phosphogypsum with Fe-P slag via a solid-state reaction

doi:10.1016/j.cjche.2021.06.025

Chinese Journal of Chemical Engineering ›› 2022, Vol. 47 ›› Issue (7): 113-119.DOI: 10.1016/j.cjche.2021.06.025

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Thermochemical decomposition of phosphogypsum with Fe-P slag via a solid-state reaction

Lei Sun¹, Zhongjun Zhao¹, Xiushan Yang¹, Yan Sun², Quande Li^3,4, Chunhui Luo¹, Qiang Zhao¹

1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2. School of Mechanical Engineering, Chengdu University, Chengdu 610106, China;
3. State Key Laboratory of Long-Life High Temperature Materials, Deyang 618000, China;
4. Dongfang Electric Corporation Dongfang Turbine Co., Ltd, Deyang 618000, China

Received:2021-02-07 Revised:2021-05-17 Online:2022-08-19 Published:2022-07-28
Contact: Qiang Zhao,E-mail:scuzq@scu.edu.cn
Supported by:
This work is financially supported by the National Natural Science Foundation of China (22108185, 51702027), the Fundamental Research Funds for the Central University in China (20826041B4126) and project of Sichuan Chengdu Science and Technology Bureau (2019-YF05-02170-SN).

Thermochemical decomposition of phosphogypsum with Fe-P slag via a solid-state reaction

Lei Sun¹, Zhongjun Zhao¹, Xiushan Yang¹, Yan Sun², Quande Li^3,4, Chunhui Luo¹, Qiang Zhao¹

1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2. School of Mechanical Engineering, Chengdu University, Chengdu 610106, China;
3. State Key Laboratory of Long-Life High Temperature Materials, Deyang 618000, China;
4. Dongfang Electric Corporation Dongfang Turbine Co., Ltd, Deyang 618000, China

通讯作者: Qiang Zhao,E-mail:scuzq@scu.edu.cn
基金资助:
This work is financially supported by the National Natural Science Foundation of China (22108185, 51702027), the Fundamental Research Funds for the Central University in China (20826041B4126) and project of Sichuan Chengdu Science and Technology Bureau (2019-YF05-02170-SN).

Abstract

Abstract: Phosphogypsum is a solid waste sourced from the wet-process phosphoric acid industry, which causes severe environmental damages. Its utilization was limited by its high decomposition temperature and high energy consumption. Herein, an Fe-P slag, which is a solid waste that mainly comprises iron phosphide (FeP) and diiron phosphide (Fe₂P), can dramatically decrease the decomposition temperature of phosphogypsum. It was found that the Fe-P slag and CaSO₄ can react as shown in the following reaction equation:2Fe_1.5P + 3CaSO₄ + 6CO₂ → Ca₃(PO₄)₂ + Fe₃O₄ + 3SO₂ + 6CO. Its reaction mechanism was further determined using the thermodynamic method. It was found that CaS was the key intermediate for this reaction. The CaSO₄ conversion for this method can reach approximately 97% under the optimized roasting conditions:the molar ratio between Fe_1.5P and CaSO₄ of 2:3, roasting temperature of 900℃, a roasting time of 8 h.

Key words: Phosphogypsum, Decomposition, Mechanism, Thermodynamic, Roasting conditions

摘要： Phosphogypsum is a solid waste sourced from the wet-process phosphoric acid industry, which causes severe environmental damages. Its utilization was limited by its high decomposition temperature and high energy consumption. Herein, an Fe-P slag, which is a solid waste that mainly comprises iron phosphide (FeP) and diiron phosphide (Fe₂P), can dramatically decrease the decomposition temperature of phosphogypsum. It was found that the Fe-P slag and CaSO₄ can react as shown in the following reaction equation:2Fe_1.5P + 3CaSO₄ + 6CO₂ → Ca₃(PO₄)₂ + Fe₃O₄ + 3SO₂ + 6CO. Its reaction mechanism was further determined using the thermodynamic method. It was found that CaS was the key intermediate for this reaction. The CaSO₄ conversion for this method can reach approximately 97% under the optimized roasting conditions:the molar ratio between Fe_1.5P and CaSO₄ of 2:3, roasting temperature of 900℃, a roasting time of 8 h.

关键词: Phosphogypsum, Decomposition, Mechanism, Thermodynamic, Roasting conditions

Lei Sun, Zhongjun Zhao, Xiushan Yang, Yan Sun, Quande Li, Chunhui Luo, Qiang Zhao. Thermochemical decomposition of phosphogypsum with Fe-P slag via a solid-state reaction[J]. Chinese Journal of Chemical Engineering, 2022, 47(7): 113-119.

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Thermochemical decomposition of phosphogypsum with Fe-P slag via a solid-state reaction

Thermochemical decomposition of phosphogypsum with Fe-P slag via a solid-state reaction

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