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Related Experiment Videos

[Stability of CaF2 at high temperature].

Qingjie Qi1, Jianzhong Liu, Xinyu Cao

  • 1Institute for Thermal Engineering, Zhejiang University, Hangzhou 310027, China. qiqj@cmee.zju.edu.cn

Huan Jing Ke Xue= Huanjing Kexue
|July 31, 2002
PubMed
Summary

Calcium fluoride (CaF2) stability was investigated at high temperatures. CaF2 undergoes hydrolysis in moist air around 830°C, with implications for fluoride pollution control.

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Area of Science:

  • Materials Science
  • Environmental Chemistry

Context:

  • Investigating the high-temperature stability of calcium fluoride (CaF2) is crucial for understanding its behavior in industrial processes and environmental conditions.
  • Elevated temperatures can significantly alter the chemical stability and reactivity of ceramic materials like CaF2.

Purpose:

  • To determine the stability limits of CaF2 under various atmospheric conditions (ambient, dry, and moist air) at high temperatures.
  • To elucidate the primary degradation mechanism of CaF2 at elevated temperatures and quantify its kinetic parameters.

Summary:

  • Calcium fluoride (CaF2) was studied using multiple analytical techniques including gaseous fluorides absorption, ion-selective electrode (ISE) measurements, differential thermal analysis (DTA), pyrohydrolysis-ISE, and X-ray diffraction (XRD).
  • The principal reaction identified was the hydrolysis of CaF2 at high temperatures, occurring noticeably around 830 ± 10°C in moist atmospheres.

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  • Kinetic analysis revealed the hydrolysis reaction to be first-order with an activation energy of 115 ± 2 kJ/mol over the temperature range of 850°C–1350°C.

    • Impact:

    • The findings provide critical data for managing fluoride emissions from high-temperature industrial activities such as coal combustion and clay brick manufacturing.
    • Understanding CaF2 hydrolysis contributes to developing strategies for fluoride pollution control and mitigating environmental impacts.