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| Fe-Ca synergistic stabilization process and resource utilization pathway for soluble phosphorus in phosphogypsum under low-carbon guidance |
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Received:November 25, 2024
Revised:December 10, 2024
Accepted:February 06, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2026.01.021 |
| KeyWord:phosphogypsum;soluble phosphorus solidification;Fe-Ca synergistic effect;neutral phosphorus-fixing agent;stabilization mechanism;resource utilization |
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| 1.Hubei Xingfa Chemicals Group Co. Ltd., Yichang 443700, Hubei, China;2.Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission, Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, College of Resources and Environmental Science, South-Central Minzu University, Wuhan 430074, China;3.Hubei Three Gorges Laboratory, Yichang 443700, Hubei, China |
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| Abstract: |
| To address the issues of high carbon emissions associated with the traditional lime neutralization method for phosphogypsum and its incompatibility with the national "Dual Carbon" goals, this study proposes the use of an Fe-Ca neutral phosphorus-fixing agent (ferrous sulfate heptahydrate and calcium carbonate) to treat phosphogypsum. This approach aims to enhance the solidification rate of soluble phosphorus and improve the performance of the resulting products. Through single-factor and orthogonal experiments, the effects of the phosphorus-fixing agent dosage, reaction temperature, and aging time on the solidification efficiency were investigated. The optimal process conditions were determined as follows: 4% ferrous sulfate heptahydrate, 4% calcium carbonate, stirring at 50 ℃ for 3 h, followed by aging for 24 h. Under these conditions, the phosphorus leaching concentration decreased to 0.02 mg·L?1, with a solidification rate of 99.9%. Mechanistic analysis revealed that Fe2+ precipitated on the surface of calcium carbonate and oxidized to Fe3+, which subsequently formed stable iron phosphate with phosphate ions, achieving efficient and stable phosphorus solidification. The mechanical properties of β-hemihydrate gypsum prepared from solidified phosphogypsum were significantly superior to those of untreated samples. This study demonstrates that the Fe-Ca phosphorus-fixing agent enables the harmless treatment and resource utilization of phosphogypsum, providing theoretical foundations and technical pathways for low-carbon transformation in the industry. |
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