Interfacial reaction between magnesia refractory and "FeO"-rich slag: Formation of magnesiowiistite layer
- Authors
- Han, Jin Sung; Heo, Jung Ho; Park, Joo Hyun
- Issue Date
- Jun-2019
- Publisher
- Pergamon Press Ltd.
- Keywords
- Magnesia refractory; Slag-refractory reaction; Magesiowustite layer; Slag penetration; Thermochemical computation; Spinel
- Citation
- Ceramics International, v.45, no.8, pp.10481 - 10491
- Indexed
- SCIE
SCOPUS
- Journal Title
- Ceramics International
- Volume
- 45
- Number
- 8
- Start Page
- 10481
- End Page
- 10491
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/2876
- DOI
- 10.1016/j.ceramint.2019.02.110
- ISSN
- 0272-8842
- Abstract
- This study investigated the reaction between CaO-SiO2-Al2O3-xFeO-MgO-MnO (CaO/SiO2 = 1.2, x = 20-50 wt %) slag and magnesia refractory. Using SEM-EDS analysis, we confirmed the formation of a (Mg,Fe) O-ss(solid_solution), called magesiowiistite (MW), intermediate layer at the slag-refractory interface. MgO dissolved from refractory and reacted with the bulk slag to form MW layer at the interface. Simultaneously, slag penetrated through micro-pores and reacted with the refractory to form MW layer. In other words, the MW layer built up in both directions from initial refractory-slag interface. The thickness of the MW layer increased as the FeO content in the slag increased, and using EDS line scanning, a Mg and Fe concentration gradient was confirmed within the MW layer. The slag, which penetrated into the refractory, had a chemical composition of the CaO-SiO2-Al2O3-MgO system without FeO, indicating that FeO was consumed by forming a MW layer at the refractory hot face. The slag-refractory interfacial reaction was simulated using thermochemical software, FactSage (TM) 7.0. The results predicted a MW monoxide composed of MgO and FeO. A spinel phase was formed when FeO was greater than 40 wt%. These thermochemical computations were comparable to our experimental findings.
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