Aspect ratio-controlled preparation of α-CaSO4·0.5H2O from phosphogypsum in potassium tartrate aqueous solution

Xiangbin Sun; Genlei Zhang; Peng Cui

doi:10.1039/C9RA03569A

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Aspect ratio-controlled preparation of α-CaSO₄·0.5H₂O from phosphogypsum in potassium tartrate aqueous solution†

Xiangbin Sun,^a Genlei Zhang

*^ab and Peng Cui*^a

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* Corresponding authors

^a School of Chemistry and Chemical Engineering, Anhui Province Key Laboratory of Controllable Chemistry Reaction and Material Chemical Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, PR China
E-mail: genleizhang@hfut.edu.cn, cuipeng@hfut.edu.cn

^b School of Materials Science and Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, PR China

Abstract

In this study, a simple and efficient strategy is developed to synthesize rod-shaped α-CaSO₄·0.5H₂O crystals with tunable aspect ratio from industrial phosphogypsum only in potassium tartrate aqueous solution at a low temperature. Industrial phosphogypsum can be effectively converted into rod-shaped α-CaSO₄·0.5H₂O crystals with the assistance of potassium tartrate, and the aspect ratio of α-CaSO₄·0.5H₂O crystals gradually decreases from 52 : 1 to 1 : 1 with increasing the concentration of potassium tartrate. The formation process of the rod-shaped α-CaSO₄·0.5H₂O crystals in this system involves the dissolution of CaSO₄·2H₂O and nucleation of α-CaSO₄·0.5H₂O crystals. The tartrate ions from potassium tartrate in this system preferentially bind to (001) and (002) facets of α-CaSO₄·0.5H₂O crystals, inhibiting the growth of α-CaSO₄·0.5H₂O crystals along the c-axis and controlling its morphology and aspect ratio.

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Article information

DOI: https://doi.org/10.1039/C9RA03569A
Article type: Paper
Submitted: 12 May 2019
Accepted: 28 Jun 2019
First published: 11 Jul 2019
This article is Open Access

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RSC Adv., 2019,9, 21601-21607

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Aspect ratio-controlled preparation of α-CaSO₄·0.5H₂O from phosphogypsum in potassium tartrate aqueous solution

X. Sun, G. Zhang and P. Cui, RSC Adv., 2019, 9, 21601 DOI: 10.1039/C9RA03569A

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