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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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WRAP_1270223-wmg-210816-investigation_on_viscosity_and_non-isothermal_crystallization_behavior_of_p-bearing_steelmaking_slags_with_varying_tio2_content.pdf - Accepted Version - Requires a PDF viewer. Download (2345Kb) |
Official URL: http://dx.doi.org/10.1007/s11663-016-0825-4
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 > 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: |
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| Date of first compliant deposit: | 22 August 2016 | ||||||||
| 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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