Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution
Abstract
:1. Introduction
2. Experimental methods
2.1. Experimental Procedure
2.2. Definition of Parameters
2.3. Analysis and Characterization
3. Results and Discussion
3.1. Ti-Bearing Electric Furnace Slag
3.2. Thermodynamic Analysis of Fluoride Leaching Reactions
3.3. Effects of Experimental Parameters on Ti Leaching Rates
3.4. Transformation of Mineral Phase
3.5. Transformation of Microstructure
3.6. Kinetics of Fluoride Leaching of Titanium
3.6.1. Selection of Leaching Kinetics Model
3.6.2. Determination of Rate Constant
3.6.3. Determination of Leaching Kinetics
3.6.4. Comparison of Experimental and Calculated Results
3.7. Leaching Solution and Leaching Residues
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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TiO2 | SiO2 | Al2O3 | MgO | CaO | Total Fe | MnO | V2O5 | Cr2O3 |
---|---|---|---|---|---|---|---|---|
51.50 | 19.01 | 14.38 | 7.42 | 3.22 | 1.88 | 1.10 | 0.63 | 0.03 |
Rate-Controlling Step | Rate Equation |
---|---|
Surface chemical reaction | |
Diffusion control through the ash or production layer |
CF−(mol/L) | Temperature (°C) | Correlation Coefficient R2 | |
---|---|---|---|
1 − (1 − X)1/3 | 1 − (2/3)X − (1 − X)2/3 | ||
8 | 60 | 0.999 | 0.924 |
70 | 0.995 | 0.933 | |
80 | 0.964 | 0.926 | |
90 | 0.978 | 0.958 | |
10 | 60 | 0.999 | 0.935 |
70 | 0.994 | 0.945 | |
80 | 0.980 | 0.959 | |
90 | 0.964 | 0.955 | |
12 | 60 | 0.999 | 0.962 |
70 | 0.987 | 0.985 | |
80 | 0.963 | 0.980 | |
90 | 0.988 | 0.985 | |
14 | 60 | 0.999 | 0.958 |
70 | 0.994 | 0.978 | |
80 | 0.975 | 0.986 | |
90 | 0.992 | 0.982 |
Ti | Si | Fe | V | Mn | Cr | Ca | Mg | Al |
---|---|---|---|---|---|---|---|---|
26.64 | 7.81 | 0.13 | 0.02 | 0.016 | 0.001 | 0 | 0 | 0 |
Ti | Al | Mg | Ca | Fe | Mn | Si | V | Cr | F |
---|---|---|---|---|---|---|---|---|---|
1.81 | 6.22 | 3.64 | 1.88 | 1.42 | 0.68 | 0.43 | 0.27 | 0.02 | 44.54 |
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Zheng, F.; Guo, Y.; Chen, F.; Wang, S.; Zhang, J.; Yang, L.; Qiu, G. Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution. Metals 2021, 11, 1176. https://doi.org/10.3390/met11081176
Zheng F, Guo Y, Chen F, Wang S, Zhang J, Yang L, Qiu G. Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution. Metals. 2021; 11(8):1176. https://doi.org/10.3390/met11081176
Chicago/Turabian StyleZheng, Fuqiang, Yufeng Guo, Feng Chen, Shuai Wang, Jinlai Zhang, Lingzhi Yang, and Guanzhou Qiu. 2021. "Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH4+]-[F−] Solution" Metals 11, no. 8: 1176. https://doi.org/10.3390/met11081176