无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2022, Vol. 54 ›› Issue (1): 62-65.doi: 10.19964/j.issn.1006-4990.2021-0131

• 研究与开发 • 上一篇    下一篇

草酸钠对半水硫酸钙晶体稳定性的影响

李正1(),胡蒙1,窦焰1(),崔鹏1,沈浩2,郑之银2,刘荣2   

  1. 1.合肥工业大学化学与化工学院,安徽合肥 230009
    2.安徽六国化工股份有限公司
  • 收稿日期:2021-03-05 出版日期:2022-01-10 发布日期:2022-03-14
  • 作者简介:李正(1995— ),男,硕士研究生,主要研究方向为无机功能性材料制备,化学工程;E-mail: 2410273785@qq.com

Effect of sodium oxalate on stability of calcium sulfate hemihydrate crystal

LI Zheng1(),HU Meng1,DOU Yan1(),CUI Peng1,SHEN Hao2,ZHENG Zhiyin2,LIU Rong2   

  1. 1. School of Chemistry and Chemical Engineer,Hefei University of Technology,Hefei 230009,China
    2. Anhui Liuguo Limited Liability Company
  • Received:2021-03-05 Published:2022-01-10 Online:2022-03-14

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。

关键词: 半水硫酸钙, 草酸钠, 化学沉淀, 形貌, 水化

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.

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

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