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Metals 2016, 6(11), 273; doi:10.3390/met6110273

Dissolution Behavior of Alumina-Based Inclusions in CaF2-Al2O3-CaO-MgO-SiO2 Slag Used for the Electroslag Metallurgy Process

School of Metallurgy, Northeastern University, Shenyang 110819, China
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Author to whom correspondence should be addressed.
Academic Editor: Alexandru Mihai Grumezescu
Received: 23 September 2016 / Revised: 4 November 2016 / Accepted: 7 November 2016 / Published: 9 November 2016
(This article belongs to the Special Issue Metallic and Metal Oxide Nanoparticles: Novel Approaches)
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Abstract

Removal of non-metallic inclusions to CaF2-based slag is one of the most important functions of electroslag remelting. In this work, the dissolution behavior for alumina-based inclusions in CaF2-Al2O3-CaO-MgO-SiO2 slag has been investigated. Results indicate that the diffusion or permeability capacity of slag components into alumina particles is F, Ca2+, Si4+, Mg2+, from strongest to weakest, for CaF2-Al2O3-CaO-MgO-SiO2 slag. Alumina inclusions react with F in liquid slag at first and then react with CaO to form xCaO-yAl2O3 system. Subsequently, MgO substitutes for CaO to form a MgO-Al2O3 system layer surrounding the other product and reactant, and then enters the liquid slag. CaF2 can improve the dissolution capacity of slag to alumina inclusions. A complex region was formed between alumina-based particles and the slag, with different areas dominated by CaF2, CaO-Al2O3, CaO-SiO2 and MgO-Al2O3. The dissolution process of alumina particles in slag is different from the formation of compound inclusions originated from the Al-O deoxidization reaction. View Full-Text
Keywords: electroslag metallurgy; alumina inclusions; fluoride containing slag; dissolution mechanism electroslag metallurgy; alumina inclusions; fluoride containing slag; dissolution mechanism
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Dong, Y.; Jiang, Z.; Yu, A. Dissolution Behavior of Alumina-Based Inclusions in CaF2-Al2O3-CaO-MgO-SiO2 Slag Used for the Electroslag Metallurgy Process. Metals 2016, 6, 273.

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