NDLI: Investigation on Viscosity and Nonisothermal Crystallization Behavior of P-Bearing Steelmaking Slags with Varying TiO$

Content Provider	Springer Nature Link
Author	Wang, Zhanjun Sun, Yongqi Sridrar, Seetharaman Zhang, Mei Zhang, Zuotai
Copyright Year	2016
Abstract	The viscous flow and crystallization behavior of CaO-SiO$_{2}$-MgO-Al$_{2}$O$_{3}$-Fe$_{t}$O-P$_{2}$O$_{5}$-TiO$_{2}$ 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 TiO$_{2}$ content. The constructed nonisothermal continuous cooling transformation (CCT) diagrams revealed that the addition of TiO$_{2}$ lowered the crystallization temperature. This can mainly be ascribed to that addition of TiO$_{2}$ promotes the formation of [TiO$_{6}$]-octahedra units and, consequently, the formation of MgFe$_{2}$O$_{4}$-Mg$_{2}$TiO$_{4}$ solid solution. Moreover, the decreasing viscosity has a significant effect on enhancing the diffusion of ion units, such as Ca$^{2+}$ and [TiO$_{4}$]-tetrahedra, from bulk melts to the crystal–melt interface. The crystallization of CaTiO$_{3}$ and CaSiTiO$_{5}$ was consequently accelerated, which can improve the phosphorus content in P-enriched phase (n2CaO·SiO$_{2}$-3CaO·P$_{2}$O$_{5}$). 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 TiO$_{2}$ content, suggesting that TiO$_{2}$ lowered the tendency for the slags to crystallize.
Starting Page	527
Ending Page	537
Page Count	11
File Format	PDF
ISSN	10735615
Journal	Metallurgical and Materials Transactions B
Volume Number	48
Issue Number	1
e-ISSN	15431916
Language	English
Publisher	Springer US
Publisher Date	2016-10-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Mechanics of Materials Condensed Matter Physics

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