Affiliation:
1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) Northeastern University Shenyang Liaoning 110819 China
2. School of Metallurgy Northeastern University Shenyang Liaoning 110819 China
3. State Key Laboratory of Metal Material for Marine Equipment and Application Anshan Liaoning 114021 China
Abstract
In the study of CaO–SiO2–Al2O3–Li2O system slag, molecular dynamics simulations are performed to analyze the behavior of Al3+ at different alkalinities. The results show that the AlO bond length increases with increasing alkalinity and is unstable compared to the SiO bond. The [AlO4]5− tetrahedra are less stable than the [SiO4]4− tetrahedra. The higher the alkalinity, the shorter the AlO bonds and the longer the CaO bonds, thus destroying the aluminum‐oxygen ionophore. Increasing alkalinity converts complex structures into simpler ones, such as AlOAl, bringing the OAlO bond angles closer to the ideal tetrahedron. Reduced slag polymerization increases the distance between neighboring [AlO4]5− tetrahedra, thereby increasing the AlOAl bond angles. The [SiO4]4− tetrahedra prefer to bond with the [AlO4]5− tetrahedra. The change in SiOAl is less than that of SiOSi. The dissociation of CaO provides the O2−, which allows the depolymerization of SiOSi to form nonbridging oxygen SiO, whereas the depolymerization of SiOAl occurs when alkalinity is sufficient to form the SiO and AlO bonds. The [AlO4]5− tetrahedra are more likely to bond with [AlO4]5− tetrahedra than [AlO4]5− tetrahedra.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics
Cited by
2 articles.
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