| 草酸钠对半水硫酸钙晶体稳定性的影响 |
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| 引用本文： | 李正,胡蒙,窦焰,崔鹏,沈浩,郑之银,刘荣.草酸钠对半水硫酸钙晶体稳定性的影响[J].无机盐工业,2022,54(1):62-65. |
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| 作者姓名： | 李正 胡蒙 窦焰 崔鹏 沈浩 郑之银 刘荣 |
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| 作者单位： | 1.合肥工业大学化学与化工学院,安徽合肥 2300092.安徽六国化工股份有限公司 |
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| 摘 要： | 以半水硫酸钙为原料、草酸钠为稳定剂,在反应温度为100 ℃、反应时间为20 min条件下,考察添加草酸钠对于半水硫酸钙保持稳定性的影响。采用XRD、TG和离子束切割晶体结合SEM-Mapping等手段对产物进行表征。实验结果表明：随着草酸钠添加量的增加,半水硫酸钙稳定时间不断延长,在草酸钠添加量（质量分数）为2.5%时,半水硫酸钙稳定时间最长,达到120 min。表征结果证明了CaC2O4·H2O完全包覆半水硫酸钙,其作用机制是由于草酸钠在水中电离出C2O42-与Ca2+发生沉淀反应,在半水硫酸钙表面生成CaC2O4·H2O沉淀,从而提高了半水硫酸钙在水中的稳定性。
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| 关 键 词： | 半水硫酸钙 草酸钠 化学沉淀 形貌 水化 |
| 收稿时间： | 2021-03-05 |
Effect of sodium oxalate on stability of calcium sulfate hemihydrate crystal |
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| 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. |
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| Authors: | LI Zheng HU Meng DOU Yan CUI Peng SHEN Hao ZHENG Zhiyin LIU Rong |
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| Affiliation: | 1. School of Chemistry and Chemical Engineer,Hefei University of Technology,Hefei 230009,China2. Anhui Liuguo Limited Liability Company |
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| 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 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. |
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| Keywords: | calcium sulfate hemihydrate sodium oxalate chemical precipitation morphology hydration |
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