Study on the Process of Phosphogypsum Floatation Coupled with Acid Leaching for Impurity Removal and Whitening

GUO Wanxin; DONG Wanqiang; DENG Xiangyi; CHI Ruan; CHEN Zhuo; SUN Ningjie

doi:10.13779/j.cnki.issn1001-0076.2024.08.008

2024 Vol. 44, No. 6

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Article navigation > Conservation and Utilization of Mineral Resources > 2024 > 44(6): 129-138

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GUO Wanxin, DONG Wanqiang, DENG Xiangyi, CHI Ruan, CHEN Zhuo, SUN Ningjie. Study on the Process of Phosphogypsum Floatation Coupled with Acid Leaching for Impurity Removal and Whitening[J]. Conservation and Utilization of Mineral Resources, 2024, 44(6): 129-138. doi: 10.13779/j.cnki.issn1001-0076.2024.08.008

Citation:

GUO Wanxin, DONG Wanqiang, DENG Xiangyi, CHI Ruan, CHEN Zhuo, SUN Ningjie. Study on the Process of Phosphogypsum Floatation Coupled with Acid Leaching for Impurity Removal and Whitening[J]. Conservation and Utilization of Mineral Resources, 2024, 44(6): 129-138. doi: 10.13779/j.cnki.issn1001-0076.2024.08.008

Study on the Process of Phosphogypsum Floatation Coupled with Acid Leaching for Impurity Removal and Whitening

1.
Wuhan Institute of Technology, College of Resource and Safety Engineering, Wuhan 430074, Hubei, China
2.
Wuhan Quqing Engineering Consulting Co., Ltd., Wuhan, 430074, Hubei, China
3.
Hubei Three Gorges Laboratory Phosphogypsum Utilization Research and Development Center, Yichang, 443007, Hubei, China

More Information

Corresponding author: CHI Ruan, rac_wit@163.com

Received Date: 13 November 2023

Publish Date: 15 December 2024

Abstract

Abstract

Phosphogypsum, a bulk solid waste generated from the wet phosphoric acid process, is primarily disposed of through centralized stockpiling, which poses significant environmental risks. This study investigates the flotation and acid leaching conditions for phosphogypsum sourced from a phosphate fertilizer producer in Hubei, China. Optimal results were achieved under the following conditions: dodecylamine dosage of 200 g/t, slurry pH of 2.0, sulfuric acid concentration of 5%, liquid-solid ratio of 5:1, leaching time of 2 hours, and temperature of 35 ℃. The treated phosphogypsum exhibited a whiteness of over 70%, a CaSO₄·2H₂O purity exceeding 97%, and reduced soluble phosphorus and fluorine contents to 0.098% and 0.052%, respectively. FT-IR spectra, zeta potential, and surface tension analyses revealed that dodecylamine interacts with phosphogypsum surfaces through hydrogen bonding and physical adsorption. Additionally, the flotation process significantly decreased the silicon dioxide content in the concentrate. This method demonstrates simplicity, strong applicability, and potential to provide high-quality raw materials for the value-added utilization of phosphogypsum.
- phosphogypsum /
- flotation /
- dodecylamine /
- acid leaching /
- coupling process /
- whiteness

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References

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