Abstract
In this paper, the thermodynamic behavior of phosphorus removal from Si-Fe alloys was investigated using a computational approach based on a molecular interaction model combined with the Miedema model and the Tanaka equation. In the Si-P system, the variation of the infinitely dilute activity coefficient of phosphorus with temperature is given as: \({\text{ln}}{\gamma }_{p in si}^{o}=-0.02573-2286.07/T\). In the Si-Fe-P system, the variation of the Fe-P interaction parameter as a function of temperature is represented by the expression: \({\varepsilon }_{P}^{Fe}=0.5095+548.69/T\). Based on the above theoretical analysis, the separation efficiency of phosphorus removal from the Si-Fe-P system was calculated, and the reliability of the model was evaluated using results from dephosphorization experiments conducted with electromagnetically levitated Si-Fe alloy droplets. It is found that a removal efficiency of 94.42 pct can be achieved with a refining time of 55 min at 2023 K in a 50 pct Ar-50 pct H2 gas atmosphere.
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Abbreviations
- \({G}_{m}^{E}\) :
-
Molar excess Gibbs free energy
- \({\overline{G} }_{i}^{E}\) :
-
Partial molar excess Gibbs free energy of component i
- \(R\) :
-
Gas constant
- \(T\) :
-
System temperature
- \({x}_{i}\) :
-
Molar fraction of component i
- \({w}_{i}\) :
-
Mass fraction of component \(i\)
- \({V}_{m}\) :
-
Molar volume
- \({Z}_{i} ,{Z}_{j}\) :
-
Central molecular coordination number of component \(i\) and \(j\)
- \({B}_{ij} , {B}_{ji}\) :
-
Pair-potential energy interaction parameters of the \(i-j\) binary system
- \({k}_{B}\) :
-
Boltzma constant
- \({k}_{B}\) :
-
Activity coefficient of component i
- \(\text{N}{\gamma }_{i}^{0}\) :
-
Infinite dilute activity coefficient of component \(i\)
- \(\text{N}{\varepsilon }_{ii}^{\prime} ,{\varepsilon }_{jj}^{\prime} ,{\varepsilon }_{ij}^{\prime} ,{\varepsilon }_{ji}^{\prime}\) :
-
Pair-potential energies
- \(\text{N}{\rho }_{m}\) :
-
Molecular number density
- \(\text{N}{r}_{o} ,{r}_{m}\) :
-
The beginning and first peak values of radial distance in a radial distribution function near the melting point
- \(\text{N}\Delta {H}_{m}\) :
-
Enthalpy of fusion
- \(\text{N}{T}_{m}\) :
-
Melting temperature
- \(N{d}_{cov}\) :
-
Atomic covalent diameter
- \(\text{N}{\Delta \overline{H} }_{m}^{0}\) :
-
Partial molar enthalpy at infinite dilution
- \(\text{N}{\overline{S} }_{m}^{E}\) :
-
Partial molar excess entropy at infinite dilution
- \(\text{N}{NZ}_{c}\) :
-
Close packed coordination number
- \(\text{N}\phi\) :
-
Electronegativity
- \(\text{N}{n}_{ws}\) :
-
Electron density
- \(\text{N}u, p, r,\sigma\) :
-
Empirical constants
- \(\text{N}{\varepsilon }_{i}^{i} , {\varepsilon }_{j}^{i}\) :
-
Interaction coefficient
- \({t}_{0}, {t}_{t}\) :
-
Levitation refining time in the beginning and end
- \({a}_{i}\) :
-
Activity of component \(i\)
- \(\beta\) :
-
Separation coefficient
- \({P}_{i}^{*}\) :
-
Saturated vapor pressure of component \(i\)
- \({P}_{i}\) :
-
Partial pressure of solute \(i\) in gas phase
- \(\eta\) :
-
Removal efficiency
- \(M\) :
-
Molar mass
- \({\rho }_{i}\) :
-
Mass density of component \(i\)
- \({c}_{i}\) :
-
Concentration of component i at \({t}_{0}\) or \({t}_{t}\)
- \({Ng}_{i}\) :
-
Weight of sample at \({t}_{0}\) or \({t}_{t}\)
- \(A\) :
-
Surface area of levitated sample
- \(V\) :
-
Volume of levitated sample
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Acknowledgments
We greatly acknowledge the support of the Yunnan Provincial Department of Education Scientific Research Fund Project (Grant: 2023J0130), National Natural Science Foundation of China (Grant: 52074140) and Hunan Zhongke Electric Co. Ltd.
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Yan, P., Zhang, G., Yi, B. et al. Thermodynamic Assessment of Phosphorus Removal From Si-Fe Levitated Droplets. Metall Mater Trans B 54, 3377–3389 (2023). https://doi.org/10.1007/s11663-023-02915-0
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DOI: https://doi.org/10.1007/s11663-023-02915-0