Influence mechanism and regulation strategy of atmospheric conditions on the thermal decomposition of phosphogypsum

Jie Weizhe; Wang Tong; Su Yi; Zhou Wu; Zeng Yubo; Li Yang; Zhang Hua; Ni Hongwei

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Influence mechanism and regulation strategy of atmospheric conditions on the thermal decomposition of phosphogypsum

Updated：2026-09-17

- Influence mechanism and regulation strategy of atmospheric conditions on the thermal decomposition of phosphogypsum
- Chinese Journal of Chemical Engineering Vol. 95, Issue 7, Pages: 263-271(2026)
- Affiliations：
  
  The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, China
  Kunming University of Science and Technology, Kunming 650106, China
  Yunnan Academy of Ecological and Environmental Sciences, Kunming 650100, China
- Author bio：
  
  *Corresponding author. E-mail address:liyang2468@wust.edu.cn(Y. Li).
- Funds：
- DOI：
  CLC：
- Received：15 December 2025，
  
  Revised：2026-02-08，
  
  Accepted：10 February 2026，
  
  Online First：22 April 2026，
  
  Published：2026-07
- Accepted：
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Jie Weizhe, Wang Tong, Su Yi, et al. Influence mechanism and regulation strategy of atmospheric conditions on the thermal decomposition of phosphogypsum[J]. Chinese Journal of Chemical Engineering, 2026, 95(7): 263-271.
DOI：

Jie Weizhe, Wang Tong, Su Yi, et al. Influence mechanism and regulation strategy of atmospheric conditions on the thermal decomposition of phosphogypsum[J]. Chinese Journal of Chemical Engineering, 2026, 95(7): 263-271. DOI：

摘要

Abstract

Phosphogypsum

a large-volume phosphoric acid production by-product with significant environmental risks

demands urgent resource and high-value utilization. Reductive decomposition to high-activity quicklime is effective for this purpose. For high-quality products

improving CaO yield and inhibiting CaS formation enhances added value. Based on this

this study systematically investigates the reaction mechanism and regulation strategy of phosphogypsum decomposition to CaO under different atmospheric conditions. Special focus is placed on analyzing the effects of CO concentration

concen tration

and

partial pressure ratio on the reductive decomposition pathway and the products obtained from phosphogypsum. The results show that introducing CO

into the CO reducing atmosphere can effectively promote the conversion of CaSO

·2H

O to CaO

increasing the decomposition mass loss rate from 43.10% to 63.83%

indicating that adding CO

to the reducing atmosphere achieves directional regulation of CaO formation. When the

partial pressure ratio increases from 0.15 to 15

the mass loss rate of CaSO

·2H

O rises from 55.66% to 62.50%

demonstrating that a higher

ratio not only promotes the reaction between CaSO

and CO to form CaO but also facilitates the conversion of generat

ed CaS to CaO. Under the CO—CO

—N

mixed atmosphere

the initial reaction temperature of phosphogypsum reductive decomposition decreases by approximately 300 ◦C

while the formation of CaS is inhibited

significantly increasing the CaO content in the products and realizing directional regulation of the thermal decomposition products of phosphogypsum.

关键词

Keywords

references

F. Mohammed, W.K. Biswas, H.M. Yao, M. Tadé, Sustainability assessment of symbiotic processes for the reuse of phosphogypsum, J. Clean. Prod. 188 (2018) 497—507.

S. Bisone, M. Gautier, V. Chatain, D. Blanc, Spatial distribution and leaching behavior of pollutants from phosphogypsum stocked in a gypstack:Geochemical character ization and modeling, J. Environ. Manag. 193 (2017) 567—575.

Q.S. Chen, Q.L. Zhang, C.C. Qi, A. Fourie, C.C. Xiao, Recycling phosphogypsum and construction demolition waste for cemented paste backfill and its environmental impact, J. Clean. Prod. 186 (2018) 418—429.

Y. Chernysh, O. Yakhnenko, V. Chubur, H. Roubík, Phosphogypsum recycling:A review of environmental issues, current trends, and prospects, Appl. Sci. 11 (4) (2021) 1575.

Y. Maierdan, M.A. Haque, B. Chen, M. Maimaitiyiming, M.R. Ahmad, Recycling of waste river sludge into unfired green bricks stabilized by a combination of phosphogypsum, slag, and cement, Constr. Build. Mater. 260 (2020) 120666.

S.H. Liu, J.Y. Ouyang, J. Ren, Mechanism of calcination modification of phosphogypsum and its effect on the hydration properties of phosphogypsum-based supersulfated cement, Constr. Build. Mater. 243 (2020) 118226.

Y. Shen, J.S. Qian, J.Q. Chai, Y.Y. Fan, Calcium sulphoaluminate cements made with phosphogypsum: Production issues and material properties, Cem. Concr. Compos. 48 (2014) 67—74.

D. Ma, Q.H. Wang, Experimental study of CaS preparation from lignite-reduced phosphogypsum in a fluidized bed, J. Chem. Technol. Biotechnol. 98 (3) (2023) 756—772.

Y. Cui, J.D. Bai, I.S. Chang, J. Wu, A systematic review of phosphogypsum recycling industry based on the survey data in China—applications, drivers, obstacles, and solutions, Environ. Impact Assess. Rev. 105 (2024) 107405.

Q. Liu, X.Q. Ao, Q.L. Chen, Y. Xie, Y. Cao, Reaction characteristics and kinetics of phosphogypsum decomposition via synergistic reduction effect of composite reducing agent, J. Mater. Cycles Waste Manag. 24 (2) (2022) 595—605.

X. Jia, Q.H. Wang, K.F. Cen, L.M. Chen, An experimental study of CaSO 4 decomposition during coal pyrolysis, Fuel 163 (2016) 157—165.

F. Laasri, A. Carrillo Garcia, M. Latifi, J. Chaouki, Reaction mechanism of thermal decomposition of phosphogypsum, Waste Manag. 171 (2023) 482—490.

X.S. Yang, Z.Y. Zhang, X.L. Wang, L. Yang, B.H. Zhong, J.F. Liu, Thermodynamic study of phosphogypsum decomposition by sulfur, J. Chem. Thermodyn. 57 (2013) 39—45.

L.J. Zhao, T.M. Wan, X.S. Yang, L. Yang, X.J. Kong, Z.Y. Zhang, X.L. Wang, Effects of kaolinite addition on the melting characteristics of the reaction between phosphogypsum and CaS, J. Therm. Anal. Calorim. 119 (3) (2015) 2119—2126.

K. Antar, M. Jemal, A thermogravimetric study into the effects of additives and water vapor on the reduction of gypsum and Tunisian phosphogypsum with graphite or coke in a nitrogen atmosphere, J. Therm. Anal. Calorim. 132 (1) (2018) 113—125.

K.G. Gorbovskiy, A.I. Ryashko, A.I. Kazakov, A.M. Norov, A.I. Mikhaylichenko, The influence of water-soluble impurities on thermal dehydration kinetics of phosphogypsum in self-generated atmosphere, J. Therm. Anal. Calorim. 133 (3) (2018) 1549—1562.

D.L. Zheng, L.P. Ma, R.M. Wang, J. Yang, Q.X. Dai, Research on thermal decomposing properties of phosphogypsum with Fe addition under multi-atmosphere control, Thermochim. Acta 661 (2018) 59—66.

N. Mihara, D. Kuchar, Y. Kojima, H. Matsuda, Reductive decomposition of waste gypsum with SiO 2 , Al 2 O 3 , and Fe 2 O 3 additives, J. Mater. Cycles Waste Manag. 9 (1) (2007) 21—26.

Y. Wang, J.Z. Wang, Z.Y. Zhang, L. Yang, X.S. Yang, B.H. Zhong, X.J. Kong, X.L. Wang, Investigation of the fusion characteristics of ash in the reduction of pyrite and phosphogypsum, J. Sustain. Metall. 3 (4) (2017) 737—752.

S.R. Pinto, C. Angulski da Luz, G.S. Munhoz, R.A. Medeiros-Junior, Durability of phosphogypsum-based supersulfated cement mortar against external attack by sodium and magnesium sulfate, Cement Concr. Res. 136 (2020) 106172.

S. Zemni, M. Hajji, M. Triki, A. M'Nif, A.H. Hamzaoui, Study of phosphogypsum transformation into calcium silicate and sodium sulfate and their physicochemical characterization, J. Clean. Prod. 198 (2018) 874—881.

X. Xia, A.Q. Xia, Y.L. Qiao, G.B. Duan, Z.M. Liu, Insight into the reaction characteristics of H 2 -reduction decomposition of gypsum: Experimental and isothermal kinetic analysis, Int. J. Hydrogen Energy 49 (2024) 1344—1360.

H.A. Foner, S. Ehrlich, Simple method for the determination of gypsum, with some obser vations on the solubilities of gypsum, anhydrite, calcite and dolomite, Analyst 108 (1286) (1983) 615—620.

P.J. Xu, W.H. Liu, H. Li, Y.X. Chen, Thermal decomposition mechanism and characterization of phosphogypsum in suspension under multifactor coupling effect, Case Stud. Constr. Mater. 20 (2024) e02861.

Z.Q. Yan, Z.A. Wang, X.F. Wang, H. Liu, J.R. Qiu, Kinetic model for calcium sulfate decomposition at high temperature, Trans. Nonferrous Met. Soc. China 25 (10) (2015) 3490—3497.

H.W. He, L.F. Hao, C.G. Fan, S.G. Li, W.G. Lin, A two-step approach to phosphogypsum decomposition: Oxidation of CaS with CO 2 , Thermochim. Acta 708 (2022) 179122.

H.J. Tian, Q.J. Guo, X.H. Yue, Y.Z. Liu, Investigation into sulfur release in reductive decomposition of calcium sulfate oxygen carrier by hydrogen and carbon monoxide, Fuel Process. Technol. 91 (11) (2010) 1640—1649.

X. Xia, L.Q. Zhang, Z.Y. Li, X.L. Yuan, C.Y. Ma, Z.L. Song, G.F. Chen, Recovery of CaO from CaSO 4 via CO reduction decomposition under different atmospheres, J. Environ. Manag. 301 (2022) 113855.

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