دورية
Volatilization behaviour and volatilization kinetics of CaF2–Na2O–CaO–SiO2–Al2O3–MgO–B2O3synthetic mould flux
| العنوان: | Volatilization behaviour and volatilization kinetics of CaF2–Na2O–CaO–SiO2–Al2O3–MgO–B2O3synthetic mould flux |
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| المؤلفون: | Cui, Ya-ru, Fan, Hao-yue, Guo, Zi-liang, Wang, Guo-hua, Li, Xiao-ming, Zhao, Jun-xue, Yang, Ze |
| المصدر: | Journal of Iron and Steel Research International; April 2019, Vol. 26 Issue: 4 p412-421, 10p |
| مستخلص: | To reduce the volatilization of the volatile-containing slags and obtain accurate measurement results of slag performance, the volatility degree and deviation mechanism must be determined. Non-isothermal thermogravimetric analysis at different heating rates was used to establish the volatilization kinetic model, and it reveals the volatilization mechanism of CaF2–Na2O–CaO–SiO2–Al2O3–MgO–B2O3synthetic sodium-containing fluoride mould flux. The results demonstrated that the evaporation of NaF and SiF4was the decisive factor that led to the change in composition and deviation of properties of the tested slags. The most probable kinetic mechanism function for the evaporation of volatile component from sodium-containing fluoride mould flux could be expressed by $$g(\alpha ) = [ - \ln (1 - \alpha )]^{2/3}$$g(α)=[-ln(1-α)]2/3, with an apparent activation energy of 164.866 kJ mol−1and pre-exponential factor of 2.13 × 10−4s−1, where αis the conversion rate at any time step in the volatilization process. The reaction mechanism was random nucleation followed by growth, which was the limiting factor for the volatilization of synthetic sodium-containing fluoride mould flux. The method of increasing heating rate and adding protection gas in the measurement system will help to obtain more accurate results of slag performance. |
| قاعدة البيانات: | Supplemental Index |
Find this article in full text from Springer Verlag. | تدمد: | 1006706X 22103988 |
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| DOI: | 10.1007/s42243-019-00245-7 |