期刊
CERAMICS INTERNATIONAL
卷 46, 期 3, 页码 3631-3636出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.10.082
关键词
Viscosity; Molten structure; Ferronickel slag; Break temperature; Apparent activation energy
资金
- National Natural Science Foundation of China [U1760202]
- Program for Guangdong YangFan Introducing Innovative and Entrepreneurial Teams [2017YT05C047]
- Hunan Scientific Technology projects [2018R53022, 2018WK2051]
The effect of B2O3 content on the rheological behavior and molten structure of the MgO-SiO2-based ferronickel slag were studied at a fixed (SiO2 + Al2O3)/(MgO + CaO) mass ratio of 1.4. Results show that the viscosity of the slag melt decreased with the addition of B2O3, and B2O3 had a relatively little effect when its content was over 7 mass%. The break temperature of ferronickel slag reduced from 1711 to 1596 K and its apparent activation energy deceased from 95.34 +/- 2.61 to 23.08 +/- 1.65 kJ/mol with the addition of B2O3 from 3 to 9 mass%. Structural analyses indicate that B2O3 stripped the oxygen from the silicate structure. The formation of B-O-B structures connected by non-ring [BO3]-trihedral and [BO4]-tetrahedral structural units led to boroxol rings. These resulted in higher degree of polymerization (DOP) of both silicate and borate structures. However, the O- in [BO2O-], the dominant 2D [BO3]-trihedral structure and the formation of asymmetric Si-O-B structural units could depolymerize the network structures of ferronickel slag.
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