Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue
A novel process for the synthesis of hydrated silica derived from ferronickel slag (FNS)-leaching residue was proposed in this study. The products of the purification of hydrated silica with 99.68% grade and 95.11% recovery can be obtained through ammonium fluoride (NH<sub>4</sub>F) roas...
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MDPI AG
2024-02-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/29/4/905 |
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| author | Xuqin Duan Yu Zhang Dong Li Tong Liu Yanjun Jiang |
| author_facet | Xuqin Duan Yu Zhang Dong Li Tong Liu Yanjun Jiang |
| author_sort | Xuqin Duan |
| collection | DOAJ |
| description | A novel process for the synthesis of hydrated silica derived from ferronickel slag (FNS)-leaching residue was proposed in this study. The products of the purification of hydrated silica with 99.68% grade and 95.11% recovery can be obtained through ammonium fluoride (NH<sub>4</sub>F) roasting, followed by the process of water leaching, ammonia precipitating, and acid cleaning under the optimized conditions. The effects of NH<sub>4</sub>F mass ratio, roasting temperature, and roasting time on the water-leaching efficiency were investigated in detail. The thermodynamic and X-ray diffraction analyses indicated that the amorphous silica in FNS-leaching residue was converted to water-soluble fluoride salts ((NH<sub>4</sub>)<sub>2</sub>SiF<sub>6</sub>) during the roasting process, which are also supported by the scanning electron microscopy and thermogravimetry analyses. The Si–O bonds in amorphous silica could be effectively broken through the ammonium fluoride activation during a low-temperature roasting process. This work provides a meaningful reference for further studies on the facile synthesis of hydrated silica with similar mineral compositions. |
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| format | Article |
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| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-07T22:19:55Z |
| publishDate | 2024-02-01 |
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| series | Molecules |
| spelling | doaj.art-7c571ad0abe44c7f8a03b9a1eb6b66bb2024-02-23T15:29:12ZengMDPI AGMolecules1420-30492024-02-0129490510.3390/molecules29040905Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching ResidueXuqin Duan0Yu Zhang1Dong Li2Tong Liu3Yanjun Jiang4School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaA novel process for the synthesis of hydrated silica derived from ferronickel slag (FNS)-leaching residue was proposed in this study. The products of the purification of hydrated silica with 99.68% grade and 95.11% recovery can be obtained through ammonium fluoride (NH<sub>4</sub>F) roasting, followed by the process of water leaching, ammonia precipitating, and acid cleaning under the optimized conditions. The effects of NH<sub>4</sub>F mass ratio, roasting temperature, and roasting time on the water-leaching efficiency were investigated in detail. The thermodynamic and X-ray diffraction analyses indicated that the amorphous silica in FNS-leaching residue was converted to water-soluble fluoride salts ((NH<sub>4</sub>)<sub>2</sub>SiF<sub>6</sub>) during the roasting process, which are also supported by the scanning electron microscopy and thermogravimetry analyses. The Si–O bonds in amorphous silica could be effectively broken through the ammonium fluoride activation during a low-temperature roasting process. This work provides a meaningful reference for further studies on the facile synthesis of hydrated silica with similar mineral compositions.https://www.mdpi.com/1420-3049/29/4/905ferronickel slagleaching residuehydrated silicalow-temperature roastingammonium fluoride |
| spellingShingle | Xuqin Duan Yu Zhang Dong Li Tong Liu Yanjun Jiang Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue Molecules ferronickel slag leaching residue hydrated silica low-temperature roasting ammonium fluoride |
| title | Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue |
| title_full | Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue |
| title_fullStr | Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue |
| title_full_unstemmed | Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue |
| title_short | Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue |
| title_sort | activation mechanism of ammonium fluoride in facile synthesis of hydrated silica derived from ferronickel slag leaching residue |
| topic | ferronickel slag leaching residue hydrated silica low-temperature roasting ammonium fluoride |
| url | https://www.mdpi.com/1420-3049/29/4/905 |
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