Sequence closed-loop recovery of fluoride, phosphate, and sulfate anions from phosphogypsum leachate via precipitation-electrodialysis-crystallization approaches

Lou，Xiang Yang1; Wang，Jingfu2,3; Liang，Jiaxin1; Liu，Shan1; Wang，Ranhao1; Deng，Lili1; Li，Danhao2,4; Hu，Xinping2,3; Chen，Hong1

2024-08-21

10.1016/j.seppur.2024.127014

Separation and Purification Technology   影响因子和分区

1383-5866

1873-3794

Phosphogypsum (PG) is a large-scale industrial by-product generated during the production of phosphoric acid, typically being deposited in landfills worldwide. The leaching of fluoride (F), phosphate (PO), and sulfate (SO) anions from PG into water bodies through rainfall results in significant environmental pollution. Herein, we propose a stepwise precipitation combined with electrodialysis and crystallization strategy for efficient recovery and valorization of multiple anions from PG leachate. Our method demonstrates effectiveness both theoretically and practically. Consequently, fluoride anions were precipitated as CaF and Ca(PO)F at pH 4.7, with a recovery rate of 98.80 %; phosphate anions as MgNHPO·HO at pH 8.5, with a recovery rate of 99.91 %; and sulfate anions through electrodialysis and crystallization with a recovery efficiency of 99.89 %, ensuring effluent met discharge standards. In addition, the concentrated sulfate-rich solution was employed for electrochemical production of persulfate, yielding ammonium persulfate salts after cooling crystallization. Our integrated approach for multiple anion recovery from PG leachate offers significant environmental and economic benefits, providing valuable insights and references for future research and practical production.

Electrochemical technique Fluoride Phosphate Phosphogypsum leachate Precipitation Sulfate

SCI ; EI

英语

第一 ; 通讯

20241115737748

Effluents ; Electrodialysis ; Fluorspar ; Gypsum ; Magnesium compounds ; Negative ions ; Precipitation (chemical) ; Recovery ; Water pollution

Industrial Wastes:452.3 ; Water Pollution:453 ; Minerals:482.2 ; Chemical Operations:802.3

CHEMISTRY

2-s2.0-85187231541

Scopus

1.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550081,China
3.University of Chinese Academy of Sciences,Beijing,100049,China
4.Xi'an University of Technology,Xi'an,710048,China

Lou，Xiang Yang,Wang，Jingfu,Liang，Jiaxin,et al. Sequence closed-loop recovery of fluoride, phosphate, and sulfate anions from phosphogypsum leachate via precipitation-electrodialysis-crystallization approaches[J]. Separation and Purification Technology,2024,342.

Lou，Xiang Yang.,Wang，Jingfu.,Liang，Jiaxin.,Liu，Shan.,Wang，Ranhao.,...&Chen，Hong.(2024).Sequence closed-loop recovery of fluoride, phosphate, and sulfate anions from phosphogypsum leachate via precipitation-electrodialysis-crystallization approaches.Separation and Purification Technology,342.

Lou，Xiang Yang,et al."Sequence closed-loop recovery of fluoride, phosphate, and sulfate anions from phosphogypsum leachate via precipitation-electrodialysis-crystallization approaches".Separation and Purification Technology 342(2024).