Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] Solution
The effects of F<sup>−</sup> concentration, leaching temperature, and time on the Ti leaching from Ti-bearing electric furnace slag (TEFS) by [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] solution leaching process was investigated to reveal the leaching...
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MDPI AG
2021-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/8/1176 |
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| author | Fuqiang Zheng Yufeng Guo Feng Chen Shuai Wang Jinlai Zhang Lingzhi Yang Guanzhou Qiu |
| author_facet | Fuqiang Zheng Yufeng Guo Feng Chen Shuai Wang Jinlai Zhang Lingzhi Yang Guanzhou Qiu |
| author_sort | Fuqiang Zheng |
| collection | DOAJ |
| description | The effects of F<sup>−</sup> concentration, leaching temperature, and time on the Ti leaching from Ti-bearing electric furnace slag (TEFS) by [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] solution leaching process was investigated to reveal the leaching mechanism and kinetics of titanium. The results indicated that the Ti leaching rate obviously increased with the increase of leaching temperature and F<sup>−</sup> concentration. The kinetic equation of Ti leaching was obtained, and the activation energy was 52.30 kJ/mol. The fitting results of kinetic equations and calculated values of activation energy both indicated that the leaching rate of TEFS was controlled by surface chemical reaction. The semi-empirical kinetics equation was consistent with the real experimental results, with a correlation coefficient (<i>R</i><sup>2</sup>) of 0.996. The Ti leaching rate reached 92.83% after leaching at 90 °C for 20 min with F<sup>−</sup> concentration of 14 mol/L and [NH<sub>4</sub><sup>+</sup>]/[F<sup>−</sup>] ratio of 0.4. The leaching rates of Si, Fe, V, Mn, and Cr were 94.03%, 7.24%, 5.36%, 4.54%, and 1.73%, respectively. The Ca, Mg, and Al elements were converted to (NH<sub>4</sub>)<sub>3</sub>AlF<sub>6</sub> and CaMg<sub>2</sub>Al<sub>2</sub>F<sub>12</sub> in the residue, which can transform into stable oxides and fluorides after pyro-hydrolyzing and calcinating. |
| first_indexed | 2024-03-10T08:35:57Z |
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| id | doaj.art-2c0d7223da554e568014d5a4d0a4ff2d |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T08:35:57Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-2c0d7223da554e568014d5a4d0a4ff2d2023-11-22T08:40:34ZengMDPI AGMetals2075-47012021-07-01118117610.3390/met11081176Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] SolutionFuqiang Zheng0Yufeng Guo1Feng Chen2Shuai Wang3Jinlai Zhang4Lingzhi Yang5Guanzhou Qiu6School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaThe effects of F<sup>−</sup> concentration, leaching temperature, and time on the Ti leaching from Ti-bearing electric furnace slag (TEFS) by [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] solution leaching process was investigated to reveal the leaching mechanism and kinetics of titanium. The results indicated that the Ti leaching rate obviously increased with the increase of leaching temperature and F<sup>−</sup> concentration. The kinetic equation of Ti leaching was obtained, and the activation energy was 52.30 kJ/mol. The fitting results of kinetic equations and calculated values of activation energy both indicated that the leaching rate of TEFS was controlled by surface chemical reaction. The semi-empirical kinetics equation was consistent with the real experimental results, with a correlation coefficient (<i>R</i><sup>2</sup>) of 0.996. The Ti leaching rate reached 92.83% after leaching at 90 °C for 20 min with F<sup>−</sup> concentration of 14 mol/L and [NH<sub>4</sub><sup>+</sup>]/[F<sup>−</sup>] ratio of 0.4. The leaching rates of Si, Fe, V, Mn, and Cr were 94.03%, 7.24%, 5.36%, 4.54%, and 1.73%, respectively. The Ca, Mg, and Al elements were converted to (NH<sub>4</sub>)<sub>3</sub>AlF<sub>6</sub> and CaMg<sub>2</sub>Al<sub>2</sub>F<sub>12</sub> in the residue, which can transform into stable oxides and fluorides after pyro-hydrolyzing and calcinating.https://www.mdpi.com/2075-4701/11/8/1176Ti-bearing electric furnace slagfluorination methodleachingkineticstitanium dioxide |
| spellingShingle | Fuqiang Zheng Yufeng Guo Feng Chen Shuai Wang Jinlai Zhang Lingzhi Yang Guanzhou Qiu Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] Solution Metals Ti-bearing electric furnace slag fluorination method leaching kinetics titanium dioxide |
| title | Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] Solution |
| title_full | Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] Solution |
| title_fullStr | Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] Solution |
| title_full_unstemmed | Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] Solution |
| title_short | Fluoride Leaching of Titanium from Ti-Bearing Electric Furnace Slag in [NH<sub>4</sub><sup>+</sup>]-[F<sup>−</sup>] Solution |
| title_sort | fluoride leaching of titanium from ti bearing electric furnace slag in nh sub 4 sub sup sup f sup sup solution |
| topic | Ti-bearing electric furnace slag fluorination method leaching kinetics titanium dioxide |
| url | https://www.mdpi.com/2075-4701/11/8/1176 |
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