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Effect of sodium oxalate on stability of calcium sulfate hemihydrate crystal
Received date: 2021-03-05
Online published: 2022-03-14
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 C2O42- 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.
Zheng LI , Meng HU , Yan DOU , Peng CUI , Hao SHEN , Zhiyin ZHENG , Rong LIU . Effect of sodium oxalate on stability of calcium sulfate hemihydrate crystal[J]. Inorganic Chemicals Industry, 2022 , 54(1) : 62 -65 . DOI: 10.19964/j.issn.1006-4990.2021-0131
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