Flotation Purification of Phosphogypsum and Preparation of <i>β</i>−hemihydrate Gypsum

DONG Xiongbo; YE Guangli; NIU Mengyuan; ZHANG Cheng; ZHANG Jun; YANG Huaming

doi:10.13779/j.cnki.issn1001-0076.2024.06.009

2024 Vol. 44, No. 6

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Article navigation > Conservation and Utilization of Mineral Resources > 2024 > 44(6): 122-128

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DONG Xiongbo, YE Guangli, NIU Mengyuan, ZHANG Cheng, ZHANG Jun, YANG Huaming. Flotation Purification of Phosphogypsum and Preparation of β−hemihydrate Gypsum[J]. Conservation and Utilization of Mineral Resources, 2024, 44(6): 122-128. doi: 10.13779/j.cnki.issn1001-0076.2024.06.009

Citation:

DONG Xiongbo, YE Guangli, NIU Mengyuan, ZHANG Cheng, ZHANG Jun, YANG Huaming. Flotation Purification of Phosphogypsum and Preparation of β−hemihydrate Gypsum[J]. Conservation and Utilization of Mineral Resources, 2024, 44(6): 122-128. doi: 10.13779/j.cnki.issn1001-0076.2024.06.009

Flotation Purification of Phosphogypsum and Preparation of β−hemihydrate Gypsum

1.
Engineering Research Center of Nano−Geomaterials of Ministry of Education, Wuhan 430074, Hubei, China
2.
School of Materials and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, Hubei, China
3.
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, hunan, China
4.
Hunan Key Laboratory of Mineral Materials and Application, Central South University, Changsha 410083, hunan, China

More Information

Corresponding author: YANG Huaming, hm.yang@cug.edu.cn

Received Date: 13 June 2024

Publish Date: 15 December 2024

Abstract

Abstract

The large−scale stockpiling of phosphogypsum poses a significant environmental challenge, mainly due to its high impurity content and low whiteness, which critically limit its potential for high−value applications. This study investigated phosphogypsum from a plant in Hubei Province, integrating process mineralogy with graded flotation for efficient purification. The results showed that the use of hydrochloric acid, water glass, collector ZX−4−4 and frother Q1 in a closed circuit flotation process − consisting of one rougher flotation, two cleaner flotations and a sequential middle return−significantly improved the quality of the material. Specifically, the CaSO₄−2H₂O content of the phosphogypsum was increased from 89.65% to 98.15%, while the whiteness improved from 37.10% to 52.44%. The overall recovery rate reached 83.47% with a significant reduction in impurities: silica content decreased from 6.16% to 0.58% and iron content was minimized to 0.0062%. The whiteness of the β−hemihydrate gypsum produced by direct calcination of the purified phosphogypsum exceeded 80%, significantly exceeding the first grade specifications of the national standard GB/T 23456−2018 for phosphogypsum. Thus, the flotation process significantly improved both the quality of the phosphogypsum and the performance of the derived products.
- phosphogypsum /
- process mineralogy /
- flotation /
- impurity removal and whitening /
- β−hemihydrate gypsum

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References

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