Removal Impurity and Whitening of Phosphogypsum via Calcination and Acid Leaching

WANG Wei; PENG Weijun; TIAN Jiaxin; MIAO Yiheng; CAO Yijun

doi:10.3969/j.issn.1000-6532.2024.03.011

2024 No. 3

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Article navigation > Multipurpose Utilization of Mineral Resources > 2024 > 45(3): 70-74

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WANG Wei, PENG Weijun, TIAN Jiaxin, MIAO Yiheng, CAO Yijun. Removal Impurity and Whitening of Phosphogypsum via Calcination and Acid Leaching[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(3): 70-74. doi: 10.3969/j.issn.1000-6532.2024.03.011

Citation:

WANG Wei, PENG Weijun, TIAN Jiaxin, MIAO Yiheng, CAO Yijun. Removal Impurity and Whitening of Phosphogypsum via Calcination and Acid Leaching[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(3): 70-74. doi: 10.3969/j.issn.1000-6532.2024.03.011

Removal Impurity and Whitening of Phosphogypsum via Calcination and Acid Leaching

School of Chemical Engineering, Zhengzhou University, Zhengzhou 450010, Henan, China

More Information

Corresponding author: PENG Weijun, pwj@zzu.edu.cn

Received Date: 21 August 2022

Publish Date: 25 June 2024

Abstract

Abstract

This is an article in the field of metallurgical engineering. Large production and storage capacity of phosphogypsum has become an important factor restricting the green and healthy development of phosphorus chemical industry. Removing impurity and whitening of phosphogypsum is a necessary way for its high consumption. Analysis results showed that there was still a small amount of black organic matter in the phosphogypsum after removing impurity and desilication by flotation, which affected its whiteness. In the paper, calcination and acid leaching were adopted to treat the phosphogysum. The whiteness of whitened phosphogysum significantly increased from 51.5% to 92.7% at the conditions of calcination temperature 600 ℃, calcination time 70 min, acid leaching time 2 h, sulfuric acid concentration 1.5 mol/L, acid leaching liquid to solid ratio 5∶1 and acid leaching temperature 90 ℃. The whitened phosphogypsum was mainly CaSO₄, and contained a small amount of CaSO₄·2H₂O and CaSO₄·0.5H₂O. The particles of the whitened phosphogypsum were irregular in shape of 15～20 μm, and the surface was smooth. The study provided a guidance for the comprehensive utilization of phosphogypsum with high consumption.
- Metallurgical engineering /
- Phosphogysum /
- Whiteness /
- Calcination /
- Removing impurity /
- Whitening

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References

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