Effect of CaO on the Phase Evolution of Vanadium Slag during Crystallization and Roasting–Leaching Processes for Selective Extraction of Vanadium
In this paper, the effects of CaO on the phase evolution mechanism of vanadium slag during slagging, direct roasting, and (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> leaching processes are investigated. Results indicate that with the increase in CaO content, vanadi...
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MDPI AG
2022-06-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/7/927 |
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| author | Tao Zhang Wang Zhou Yuanyuan Li Qian Ye Xiaowen Yu Zhao Chen |
| author_facet | Tao Zhang Wang Zhou Yuanyuan Li Qian Ye Xiaowen Yu Zhao Chen |
| author_sort | Tao Zhang |
| collection | DOAJ |
| description | In this paper, the effects of CaO on the phase evolution mechanism of vanadium slag during slagging, direct roasting, and (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> leaching processes are investigated. Results indicate that with the increase in CaO content, vanadium is always concentrated as (Fe, Mn, Mg)V<sub>2</sub>O<sub>4</sub> in spinels, part of titanium is concentrated and transformed into CaTiO<sub>3</sub>, and phosphorus is concentrated in 3CaO·P<sub>2</sub>O<sub>5</sub> (C<sub>3</sub>P) and transformed into n·2CaO·SiO<sub>2</sub>-3CaO·P<sub>2</sub>O<sub>5</sub> (nC<sub>2</sub>S-C<sub>3</sub>P). During the direct roasting process, a part of the vanadium-containing spinel phase oxidizes and reacts with Ca<sub>2</sub>SiO<sub>4</sub> to produce calcium vanadate (Ca<sub>3</sub>V<sub>2</sub>O<sub>8</sub>, Ca<sub>10</sub>V<sub>6</sub>O<sub>25</sub>, and Ca<sub>2</sub>V<sub>2</sub>O<sub>7</sub>), which is soluble in (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> aqueous solution. However, a part of the vanadium-containing spinel phase is oxidized and decomposed to vanadium oxides (V<sub>2</sub>O<sub>5</sub> and V<sub>6</sub>O<sub>13</sub>), which are insoluble in (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> aqueous solution. This is not beneficial for vanadium extraction using (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> aqueous solution. In addition, (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> aqueous solution can restrain the leaching of C<sub>3</sub>P from the nC<sub>2</sub>S-C<sub>3</sub>P solid solution in the directly roasted vanadium slag with high CaO content. |
| first_indexed | 2024-03-09T03:33:57Z |
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| id | doaj.art-d328a15374c54ad8b80d42dda00159e8 |
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| language | English |
| last_indexed | 2024-03-09T03:33:57Z |
| publishDate | 2022-06-01 |
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| spelling | doaj.art-d328a15374c54ad8b80d42dda00159e82023-12-03T14:52:17ZengMDPI AGCrystals2073-43522022-06-0112792710.3390/cryst12070927Effect of CaO on the Phase Evolution of Vanadium Slag during Crystallization and Roasting–Leaching Processes for Selective Extraction of VanadiumTao Zhang0Wang Zhou1Yuanyuan Li2Qian Ye3Xiaowen Yu4Zhao Chen5Department of Science and Research, Chongqing University of Education, Chongqing 400065, ChinaChongqing CEPREI Industrial Technology Research Institute Co., Ltd., Chongqing 401332, ChinaDepartment of Science and Research, Chongqing University of Education, Chongqing 400065, ChinaDepartment of Science and Research, Chongqing University of Education, Chongqing 400065, ChinaChongqing CEPREI Industrial Technology Research Institute Co., Ltd., Chongqing 401332, ChinaChongqing CEPREI Industrial Technology Research Institute Co., Ltd., Chongqing 401332, ChinaIn this paper, the effects of CaO on the phase evolution mechanism of vanadium slag during slagging, direct roasting, and (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> leaching processes are investigated. Results indicate that with the increase in CaO content, vanadium is always concentrated as (Fe, Mn, Mg)V<sub>2</sub>O<sub>4</sub> in spinels, part of titanium is concentrated and transformed into CaTiO<sub>3</sub>, and phosphorus is concentrated in 3CaO·P<sub>2</sub>O<sub>5</sub> (C<sub>3</sub>P) and transformed into n·2CaO·SiO<sub>2</sub>-3CaO·P<sub>2</sub>O<sub>5</sub> (nC<sub>2</sub>S-C<sub>3</sub>P). During the direct roasting process, a part of the vanadium-containing spinel phase oxidizes and reacts with Ca<sub>2</sub>SiO<sub>4</sub> to produce calcium vanadate (Ca<sub>3</sub>V<sub>2</sub>O<sub>8</sub>, Ca<sub>10</sub>V<sub>6</sub>O<sub>25</sub>, and Ca<sub>2</sub>V<sub>2</sub>O<sub>7</sub>), which is soluble in (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> aqueous solution. However, a part of the vanadium-containing spinel phase is oxidized and decomposed to vanadium oxides (V<sub>2</sub>O<sub>5</sub> and V<sub>6</sub>O<sub>13</sub>), which are insoluble in (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> aqueous solution. This is not beneficial for vanadium extraction using (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> aqueous solution. In addition, (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> aqueous solution can restrain the leaching of C<sub>3</sub>P from the nC<sub>2</sub>S-C<sub>3</sub>P solid solution in the directly roasted vanadium slag with high CaO content.https://www.mdpi.com/2073-4352/12/7/927vanadium slagphase evolutionvanadiumphosphorus |
| spellingShingle | Tao Zhang Wang Zhou Yuanyuan Li Qian Ye Xiaowen Yu Zhao Chen Effect of CaO on the Phase Evolution of Vanadium Slag during Crystallization and Roasting–Leaching Processes for Selective Extraction of Vanadium Crystals vanadium slag phase evolution vanadium phosphorus |
| title | Effect of CaO on the Phase Evolution of Vanadium Slag during Crystallization and Roasting–Leaching Processes for Selective Extraction of Vanadium |
| title_full | Effect of CaO on the Phase Evolution of Vanadium Slag during Crystallization and Roasting–Leaching Processes for Selective Extraction of Vanadium |
| title_fullStr | Effect of CaO on the Phase Evolution of Vanadium Slag during Crystallization and Roasting–Leaching Processes for Selective Extraction of Vanadium |
| title_full_unstemmed | Effect of CaO on the Phase Evolution of Vanadium Slag during Crystallization and Roasting–Leaching Processes for Selective Extraction of Vanadium |
| title_short | Effect of CaO on the Phase Evolution of Vanadium Slag during Crystallization and Roasting–Leaching Processes for Selective Extraction of Vanadium |
| title_sort | effect of cao on the phase evolution of vanadium slag during crystallization and roasting leaching processes for selective extraction of vanadium |
| topic | vanadium slag phase evolution vanadium phosphorus |
| url | https://www.mdpi.com/2073-4352/12/7/927 |
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