High Temperature and High Pressure Experiment and Modification of Phosphogypsum

ZHOU Dengfeng; SHAN Shuangming; YANG Ruidong; LUO Chaokun; NI Xinran; WANG Longbo

doi:10.11858/gywlxb.20200656

Volume 35 Issue 3

Jun 2021

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Chinese Journal of High Pressure Physics > 2021 > 35(3): 031101.

ZHOU Dengfeng, SHAN Shuangming, YANG Ruidong, LUO Chaokun, NI Xinran, WANG Longbo. High Temperature and High Pressure Experiment and Modification of Phosphogypsum[J]. Chinese Journal of High Pressure Physics, 2021, 35(3): 031101. doi: 10.11858/gywlxb.20200656

Citation:

ZHOU Dengfeng, SHAN Shuangming, YANG Ruidong, LUO Chaokun, NI Xinran, WANG Longbo. High Temperature and High Pressure Experiment and Modification of Phosphogypsum[J]. Chinese Journal of High Pressure Physics, 2021, 35(3): 031101. doi: 10.11858/gywlxb.20200656

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High Temperature and High Pressure Experiment and Modification of Phosphogypsum

doi: 10.11858/gywlxb.20200656

ZHOU Dengfeng^{1, 2
,},
SHAN Shuangming³,
YANG Ruidong^{1, 2,*
,
,},
LUO Chaokun^{1, 2},
NI Xinran^{1, 2},
WANG Longbo^{1, 2}

1.
School of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, Guizhou, China
2.
Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, Guizhou, China
3.
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, Guizhou, China

Received Date: 13 Dec 2020
Rev Recd Date: 25 Jan 2021

Abstract

Abstract

In this paper, the effects of high temperature and high pressure on single system and composite system of phosphogypsum were studied. By controlling the experimental conditions of high temperature and high pressure, the crystal morphology and mineral composition of different phosphogypsum systems at 300 ℃ and 300 MPa were studied. The phase and morphology of the synthesized samples were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD characterization results show that the mineral types and contents of different phosphogypsum systems were changed significantly under high temperature and high pressure. The specific performance is as follows: after high temperature and high pressure test, the SiO₂ content of phosphogypsum-quicklime composite system is lower than the detection limit; after high temperature and high pressure test, the mineral of phosphogypsum-diatomite composite system is completely transformed from dihydrate gypsum to anhydrous gypsum. SEM characterization results show that: in single phosphogypsum system, phosphogypsum-quicklime composite system, phosphogypsum-silica fume composite system and phosphogypsum-cement composite system, phosphogypsum crystals can spontaneously grow and crystallize in the reactor under high temperature and high pressure, with regular morphology and uniform dispersion. Most of the crystals are tetragonal, with smooth surface and agglomeration. The results show that the morphology of calcium sulfate whiskers is regular and uniform, the average diameter is 2.61 μm, and the average aspect ratio is about 8.
- phosphogypsum,
- high temperature and high pressure,
- admixture,
- calcium sulfate whisker,
- aspect ratio

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References(28)

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High Temperature and High Pressure Experiment and Modification of Phosphogypsum

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