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Role of polyacrylamide in the removal of soluble phosphorus and fluorine from phosphogypsum

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Abstract

Phosphogypsum, an industrial solid waste produced in wet phosphoric acid production, is difficult to be utilized due to the harmful impurities such as phosphorus and fluorine. In this study, lime neutralization process was introduced to remove soluble phosphorus and soluble fluorine from phosphogypsum in presence of polyacrylamide. The effects of polyacrylamide content, CaO content and aging time on the removal efficiencies of soluble phosphorus and soluble fluorine were investigated by response surface methodology. The results showed that in the presence of 0.03% polyacrylamide, the removal efficiencies of soluble phosphorus and soluble fluorine in phosphogypsum increased from 86.25% and 94.02% to 93.27% and 96.07%, respectively. The optimum removal conditions for soluble phosphorus and soluble fluorine were determined by the response surface method with polyacrylamide content of 0.022%, aging time of 2.203 h and CaO content of 1.956%, and the optimized removal efficiencies of soluble phosphorus and soluble fluorine were 99.12% and 96.84%, respectively. Compared with separate lime action, the removal efficiencies were increased by 12.87% and 2.82%, respectively. The accuracy of the results was demonstrated through in situ leaching experiments. The treated phosphogypsum, the 0.02% soluble phosphorus and 0.03% soluble fluorine met the requirements of gypsum building materials.

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Acknowledgements

The financial supports for this work from Hubei Province Key Research and Development Project (No. 2023BCB114), Hubei Three Gorges Laboratory (SC211013) and the Young Top-notch Talent Cultivation Program of Hubei Province are greatly appreciated.

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Authors and Affiliations

  1. School of Resources and Safty Engineering, Wuhan Institute of Technology, Wuhan, 430073, China

    Chufang Liang, Siting Xu, Fang Zhou, Bona Deng, Meng Tian, Lisen Zhang & Ruan Chi

  2. Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan, 430073, China

    Fang Zhou, Bona Deng, Chunqiao Xiao & Ruan Chi

  3. Hubei Three Gorges Laboratory, Yichang, 443008, China

    Ruan Chi

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  1. Chufang Liang
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Correspondence to Fang Zhou.

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Liang, C., Xu, S., Zhou, F. et al. Role of polyacrylamide in the removal of soluble phosphorus and fluorine from phosphogypsum. J Mater Cycles Waste Manag 26, 478–490 (2024). https://doi.org/10.1007/s10163-023-01849-8

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