Crystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxes
To explore the effects of TiO2 and/or B2O3 on crystallization of the glassy fluoride-free slag film near the copper mould, the crystallization characteristics of glassy fluoride-free mold fluxes with fluoride being substituted by TiO2 and/or B2O3 were investigated using X- ray diffraction (XRD), sca...
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University of Belgrade, Technical Faculty, Bor
2020-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000018W.pdf |
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| author | Wang Z. Shu Q.-F. Chou K.-C. |
| author_facet | Wang Z. Shu Q.-F. Chou K.-C. |
| author_sort | Wang Z. |
| collection | DOAJ |
| description | To explore the effects of TiO2 and/or B2O3 on crystallization of the glassy fluoride-free slag film near the copper mould, the crystallization characteristics of glassy fluoride-free mold fluxes with fluoride being substituted by TiO2 and/or B2O3 were investigated using X- ray diffraction (XRD), scanning electron microscope (SEM) and differential thermal analysis (DTA) techniques. The glass forming ability index (Kgl) of the glassy fluoride-free mold fluxes was studied using Hruby’s method. The XRD and SEM analysis show that Ca2Al2SiO7, CaTiO3 and CaSiO3 are the dominant crystals of this fluoride-free mold fluxes system. With the content of TiO2 increasing from 0 to 7%, the crystallization of Ca2Al2SiO7 and CaSiO3 are inhibited and the formation of CaTiO3 is also weak, so crystallization tendency of the glassy fluoride-free mold fluxes weakens. But as TiO2 content reaches 10%, the crystallization tendency strengthens because of the strong crystallization of CaTiO3. An increase of B2O3 inhibits the crystallization of calcium silicate, so it weakens the crystallization tendency of the glassy fluoride-free mold fluxes. The crystallization processes of the studied fluoride-free mold fluxes correspond to the surface crystallization mechanism. This research provides important reference for further investigation on the heat transfer behavior of the TiO2 and B2O3-bearing slag between copper mould and slab to evaluate the feasibility of B2O3 and TiO2- bearing fluoride-free mold fluxes. |
| format | Article |
| id | doaj-art-f2b60680d4a94516a1ac85cffd7c8379 |
| institution | Kabale University |
| issn | 1450-5339 2217-7175 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-f2b60680d4a94516a1ac85cffd7c83792025-02-02T13:44:44ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752020-01-0156227928710.2298/JMMB191128018W1450-53392000018WCrystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxesWang Z.0Shu Q.-F.1Chou K.-C.2Institute of Process Engineering, Chinese Academy of Sciences, State Key Laboratory of Multiphase Complex Systems, Beijing, P.R. China + University of Chinese Academy of Sciences, School of Chemical Engineering, Beijing, P.R. China + Nanjing IPE InstituteUniversity of Science and Technology Beijing, State Key Laboratory of Advanced Metallurgy, Beijing, P.R. ChinaUniversity of Science and Technology Beijing, State Key Laboratory of Advanced Metallurgy, Beijing, P.R. ChinaTo explore the effects of TiO2 and/or B2O3 on crystallization of the glassy fluoride-free slag film near the copper mould, the crystallization characteristics of glassy fluoride-free mold fluxes with fluoride being substituted by TiO2 and/or B2O3 were investigated using X- ray diffraction (XRD), scanning electron microscope (SEM) and differential thermal analysis (DTA) techniques. The glass forming ability index (Kgl) of the glassy fluoride-free mold fluxes was studied using Hruby’s method. The XRD and SEM analysis show that Ca2Al2SiO7, CaTiO3 and CaSiO3 are the dominant crystals of this fluoride-free mold fluxes system. With the content of TiO2 increasing from 0 to 7%, the crystallization of Ca2Al2SiO7 and CaSiO3 are inhibited and the formation of CaTiO3 is also weak, so crystallization tendency of the glassy fluoride-free mold fluxes weakens. But as TiO2 content reaches 10%, the crystallization tendency strengthens because of the strong crystallization of CaTiO3. An increase of B2O3 inhibits the crystallization of calcium silicate, so it weakens the crystallization tendency of the glassy fluoride-free mold fluxes. The crystallization processes of the studied fluoride-free mold fluxes correspond to the surface crystallization mechanism. This research provides important reference for further investigation on the heat transfer behavior of the TiO2 and B2O3-bearing slag between copper mould and slab to evaluate the feasibility of B2O3 and TiO2- bearing fluoride-free mold fluxes.http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000018W.pdffluoride-free mold fluxescrystallizationslagglass forming ability indexsurface crystallizationtio2 |
| spellingShingle | Wang Z. Shu Q.-F. Chou K.-C. Crystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxes Journal of Mining and Metallurgy. Section B: Metallurgy fluoride-free mold fluxes crystallization slag glass forming ability index surface crystallization tio2 |
| title | Crystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxes |
| title_full | Crystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxes |
| title_fullStr | Crystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxes |
| title_full_unstemmed | Crystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxes |
| title_short | Crystallization characteristics of B2O3 and TiO2-bearing glassy fluoride-free mold fluxes |
| title_sort | crystallization characteristics of b2o3 and tio2 bearing glassy fluoride free mold fluxes |
| topic | fluoride-free mold fluxes crystallization slag glass forming ability index surface crystallization tio2 |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2020/1450-53392000018W.pdf |
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