Journal
ISIJ INTERNATIONAL
Volume 61, Issue 11, Pages 2765-2772Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.ISIJINT-2021-236
Keywords
basic oxygen steelmaking; surface tension; melt structure; Raman spectroscopy; micro-structure mechanism
Categories
Funding
- National Natural Science Foundation of China [51974075, 51904064]
- National Key R&D Program of China [2017YFC0805100]
- Open Funds of State Key Laboratory of Metal Material for Marine Equipment and Application [SKLMEA-K202001]
- China Postdoctoral Science Foundation [2020T130084]
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By analyzing the structural behaviors of components through Raman spectroscopy, this study clarified the transformation mechanism of surface tension in relation to composition changes in CaO-MgO-SiO2-FexO-P2O5 slags. It was found that an increase in CaO/SiO2 ratio led to more non-bridging oxygen bonds and higher surface tension, while an increase in P=O bonds effectively reduced surface tension. Ultimately, a surface tension estimation equation was established based on the deconvolution results of melt structures.
For comprehensive understanding and control of the properties of CaO -MgO-SiO2 FexO-P2O5 slags, thorough investigation of the surface tension -structure relationship is required. In this study, the structural behaviors of components were analyzed by Raman spectroscopy, and the transformation mechanism of surface tension as a function of composition was clarified. The results showed that with CaO/SiO2 increasing from 0.5 to 2.0, O(2-)resulted in the progressive breaking of bridging oxygen bonds in [SiO4]-and [PO4]tetrahedrons, and Ca2+ contributed to the stabilization of [Fead-tetrahedrons, thereby promoting the transformation from [FeO6]-octahedrons to [FeO4]-tetrahedrons. Although the network-forming ability of Fe3+ was enhanced, the overall no-bridging oxygen number still showed a gradual increase and thus the non-bridging oxygen bonds with higher unsatisfied energy in the surface layer led to an increase in surface tension. Nonetheless, the increasing P=O bonds effectively reduced surface tension due to its stable configuration in the range of CaO/SiO2 = 0.5-1.0, diminishing the increasing magnitude of surface tension. Furthermore, a strong linear relationship between surface tension and the logarithm of structural parameters was found. On this basis, a surface tension estimation equation applied to the CaO-MgO-SiO2-FexO-P2O5-based system was established in terms of the deconvolution results of the melt structures.
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