草酸钠对半水硫酸钙晶体稳定性的影响

doi:10.19964/j.issn.1006-4990.2021-0131

Abstract

Abstract:

Calcium sulfate hemihydrate used as raw material and sodium oxalate used as stabilizer,under the conditions of re-action temperature of 100 ℃ and reaction time of 20 minutes,the effect of sodium oxalate on the stability of calcium sulfate hemihydrate was investigated.The products were characterized by XRD,TG,ion beam cutting and SEM mapping.The experi-mental result implied that with the increase of sodium oxalate addition,the stability time of calcium sulfate hemihydrate was continuously extended.When the addition amount of sodium oxalate was 2.5%,the stability time of calcium sulfate hemihy-drate reached 120 min which was the longest.The characterization results showed that CaC₂O₄·H₂O completely covered calci-um sulfate hemihydrate,and its mechanism was that sodium oxalate ionized C₂O₄^2- in water and precipitated with Ca²⁺ to form CaC₂O₄·H₂O precipitation on the surface of calcium sulfate hemihydrate,so as to improve the stability of calcium sulfate hemihydrate in water.

Key words: calcium sulfate hemihydrate, sodium oxalate, chemical precipitation, morphology, hydration

CLC Number:

TQ132.32

LI Zheng,HU Meng,DOU Yan,CUI Peng,SHEN Hao,ZHENG Zhiyin,LIU Rong. Effect of sodium oxalate on stability of calcium sulfate hemihydrate crystal[J]. Inorganic Chemicals Industry, 2022, 54(1): 62-65.

Figures/Tables 10

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References 12

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反应	K	ΔG/（kJ·mol^-1）
Ca²⁺+SO₄^2-+2H₂O=CaSO₄·2H₂O	8.397×10⁴	-35.174
Ca²⁺+C₂O₄^2-+H₂O=CaC₂O₄·H₂O	3.362×10⁸	-60.906
CaSO₄·0.5H₂O+1.5H₂O=CaSO₄·2H₂O	1.552	-1.364

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Effect of sodium oxalate on stability of calcium sulfate hemihydrate crystal

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