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Investigation on viscosity and non-isothermal crystallization behavior of P-bearing steelmaking slags with varying TiO2 content

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Wang, Zhanjun, Sun, Yongqi, Sridhar, Seetharaman, Zhang, Mei and Zhang, Zuotai (2017) Investigation on viscosity and non-isothermal crystallization behavior of P-bearing steelmaking slags with varying TiO2 content. Metallurgical and Materials Transactions B, 48 (1). pp. 527-537. doi: 10.1007/s11663-016-0825-4

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Official URL: http://dx.doi.org/10.1007/s11663-016-0825-4

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Abstract

The viscous flow and crystallization behavior of CaO-SiO2-MgO-Al2O3-FetO-P2O5-TiO2 steelmaking slags have been investigated over a wide range of temperatures under Ar (High purity, >99.999 pct) atmosphere, and the relationship between viscosity and structure was determined. The results indicated that the viscosity of the slags slightly decreased with increasing TiO2 content. The constructed nonisothermal continuous cooling transformation (CCT) diagrams revealed that the addition of TiO2 lowered the crystallization temperature. This can mainly be ascribed to that addition of TiO2 promotes the formation of [TiO6]-octahedra units and, consequently, the formation of MgFe2O4-Mg2TiO4 solid solution. Moreover, the decreasing viscosity has a significant effect on enhancing the diffusion of ion units, such as Ca2+ and [TiO4]-tetrahedra, from bulk melts to the crystal–melt interface. The crystallization of CaTiO3 and CaSiTiO5 was consequently accelerated, which can improve the phosphorus content in P-enriched phase (n2CaO·SiO2-3CaO·P2O5). Finally, the nonisothermal crystallization kinetics was characterized and the activation energy for the primary crystal growth was derived such that the activation energy increases from −265.93 to −185.41 KJ·mol−1 with the addition of TiO2 content, suggesting that TiO2 lowered the tendency for the slags to crystallize.

Item Type: Journal Article
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Slag, Steel -- Metallurgy, Viscosity
Journal or Publication Title: Metallurgical and Materials Transactions B
Publisher: Springer New York LLC
ISSN: 1073-5615
Official Date: February 2017
Dates:
DateEvent
February 2017Published
24 October 2016Available
20 August 2016Accepted
Volume: 48
Number: 1
Page Range: pp. 527-537
DOI: 10.1007/s11663-016-0825-4
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), National High Technology R&D Program of China
Grant number: 51522401, 51472007, 51372019 (NSFC), 863 Program 2012AA06A114 (National High Technology R&D Program of China)

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