Preparation of α-CaSO4·0.5H2O Crystals from Chlorine-Free Salt Solution at Atmospheric Pressure

Abstract

Abstract: The effects of reaction temperature, reaction time, liquid-solid ratio, pH value and Na₂SO₄ mass fraction on the generation of α-CaSO₄·0.5H₂O were investigated using Na₂SO₄ solution as the reaction medium. The results show that α-CaSO₄·0.5H₂O crystals with an average length of 46.0 μm, an average aspect ratio of 17.23 and a homogeneous morphology are prepared under the conditions of Na₂SO₄ mass fraction of 12.5%, liquid-solid ratio of 5∶1, pH value of 7, reaction temperature of 97 ℃ and reaction time of 4 h. The method of chloride-free salt solution under atmospheric pressure overcomes the drawbacks of chloride ion corrosion of industrial equipment and environmental pollution, providing important technical support for the high value utilization of phosphogypsum.

Key words: atmospheric pressure, chlorine-free salt, sodium sulfate, α-calcium sulfate hemihydrate, homogeneous morphology, high value utilization

CLC Number:

O784

LI Xueli, GUO Jingjing, HUO Tengfei, BAI Jiale, ZHANG Yantu. Preparation of α-CaSO₄·0.5H₂O Crystals from Chlorine-Free Salt Solution at Atmospheric Pressure[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(5): 855-863.

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Preparation of α-CaSO₄·0.5H₂O Crystals from Chlorine-Free Salt Solution at Atmospheric Pressure

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