Study on Whitening of Phosphogypsum via Bleaching and Calcination

TIAN Jiaxin; PENG Weijun; MIAO Yiheng; CAO Yijun

doi:10.13779/j.cnki.issn1001-0076.2021.03.012

2021 Vol. 41, No. 3

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Article navigation > Conservation and Utilization of Mineral Resources > 2021 > 41(3): 76-80

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TIAN Jiaxin, PENG Weijun, MIAO Yiheng, CAO Yijun. Study on Whitening of Phosphogypsum via Bleaching and Calcination[J]. Conservation and Utilization of Mineral Resources, 2021, 41(3): 76-80. doi: 10.13779/j.cnki.issn1001-0076.2021.03.012

Citation:

TIAN Jiaxin, PENG Weijun, MIAO Yiheng, CAO Yijun. Study on Whitening of Phosphogypsum via Bleaching and Calcination[J]. Conservation and Utilization of Mineral Resources, 2021, 41(3): 76-80. doi: 10.13779/j.cnki.issn1001-0076.2021.03.012

Study on Whitening of Phosphogypsum via Bleaching and Calcination

School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China

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

Received Date: 07 April 2021

Publish Date: 25 June 2021

Abstract

Abstract

Phosphogypsum have has become the important factor that restricts the sustainable development of phosphorous chemical industry. Removal impurity and whitening of phosphogypsum is the only way to realize its large-scale utilization in building materials and fillers. In this paper, the phosphogypsum after flotation was treated by bleaching and calcination. Under the conditions of leaching temperature of 90 ℃, liquid-solid ratio of 4:1, Ca(ClO)₂ dosage of 3.0% and leaching time of 3.0 h, the whiteness of bleached phosphogypsum increased from 51.5% to 74.5%. Furthermore, the whiteness of the whitened phosphogypsum significantly reached 86.1% after calcining at 600 ℃ for 120 min, which met the requirements of gypsum plaster and PVC filler. The main component of phosphogypsum after calcination was CaSO₄, which was an irregular sheet structure with smooth surface and different sizes. This study has an important guiding significance for the large-scale comprehensive utilization of phosphogypsum.
- phosphogypsum /
- Ca(ClO)₂ /
- bleaching /
- calcination /
- whitening

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