化工进展

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Fe3+对水热合成硫酸钙晶须性能的影响

吕鹏飞,费德君,党亚固   

  1. 四川大学化工学院,四川 成都 610065
  • 出版日期:2014-01-05 发布日期:2014-01-05

Influence of Fe3+ on calcium sulfate whisker by hydrothermal synthesis

Lü Pengfei,FEI Dejun,DANG Yagu   

  1. School of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan,China
  • Online:2014-01-05 Published:2014-01-05

摘要: 以硫酸钙(分析纯)、磷石膏为原料,水热法制备硫酸钙晶须,实验考察了Fe3+对晶须性能的影响。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、透射电子显微镜(TEM)、选区电子衍射(SAED)、能量色散X射线光谱仪(EDX)等对产物进行表征。结果表明,Fe3+可促进硫酸钙晶须的轴向生长,有助于获得大长径比的硫酸钙晶须;当n(Ca)/n(Fe)=20左右时,硫酸钙(分析纯)制得晶须长径比达到最大值80,磷石膏制得晶须长径比为60;Fe3+可有效改善磷石膏水热制得晶须的形貌,抑制晶体的分叉生长,对磷石膏制得晶须白度也有一定程度的提高。

关键词: 硫酸钙, 磷石膏, 结晶, 水热, 形态学

Abstract: Calcium sulfate whiskers were prepared from commercial CaSO4?2H2O or phosphogypsum. The influence of Fe3+ on properties of calcium sulfate whiskers were studied. The methods including scanning electron microscopy,X-ray powder diffraction,TEM,SAED and EDX were used for characterizing the resultant crystals. The crystals grew along the c-axis and the aspect ratio of calcium sulfate whiskers increased obviously with Fe3+. When n(Ca)/n(Fe)=20,the aspect ratios of calcium sulfate whisker from commercial CaSO4?2H2O and phosphogypsum were up to 80 and 60 respectively. In the presence of Fe3+,well-developed whiskers were attained from phosphogypsum and whiteness of calcium sulfate whiskers was improved.

Key words: calsium sulfate, phosphogypsum, crystallization, hydrothermal, morphology

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