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
研究与开发

草酸钠对半水硫酸钙晶体稳定性的影响

  • 李正 ,
  • 胡蒙 ,
  • 窦焰 ,
  • 崔鹏 ,
  • 沈浩 ,
  • 郑之银 ,
  • 刘荣
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  • 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
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

收稿日期: 2021-03-05

  网络出版日期: 2022-03-14

Effect of sodium oxalate on stability of calcium sulfate hemihydrate crystal

  • Zheng LI ,
  • Meng HU ,
  • Yan DOU ,
  • Peng CUI ,
  • Hao SHEN ,
  • Zhiyin ZHENG ,
  • Rong LIU
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  • 1. School of Chemistry and Chemical Engineer,Hefei University of Technology,Hefei 230009,China
    2. Anhui Liuguo Limited Liability Company

Received date: 2021-03-05

  Online published: 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。

本文引用格式

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

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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