A post‐mortem analysis of the used gel‐bonded Al2O3–MgAl2O4 castables in an industrial steelmaking ladle. Issue 3 (22nd November 2022)

• Record Type: Journal Article
• Authors: Li, Yuanyuan; Li, Guohua; Liu, Guangping; Zhao, Yi; Li, Nan; Chen, Junfeng
• Is Part Of: International journal of applied ceramic technology. Volume 20:Issue 3(2023)
• Page Start: 1978
• Page End: 1989
• Publication Date: 2022-11-22
• Subjects: corrosion mechanism -- molten steel -- refining ladle -- spinel‐containing refractory; Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.14271
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: In this work, a cement‐free alumina‐spinel (Al2 O3 –MgAl2 O4 ) castables with a new aluminum–magnesium gel binder were developed to line the Ruhrstahl Heraeus refining ladle, chemical attacks, and degradation mechanisms of the used alumina‐spinel castables after industrial trials were investigated. The results indicated that a reaction product layer of (Mg, Fe)Al2 O4 was observed between the slag layer and penetration layer (PL), which was mainly derived from the reaction between MgAl2 O4 spinel in the refractory matrix and FeO t from slag or an oxidation of steel, and thereby prevented the further penetration of FeO t . Meanwhile, the in situ spinel could also entrap slight CaO, SiO2, and FeO t from the infiltrated slag to form composite spinel in the PL. Moreover, chemical corrosion/penetration and structural spalling dominated the degradation process of the refractory lining in this case. Cracks formed between the deteriorated layer and original layer because of mechanical and thermal stress, which caused spalling from the refractory's hot face.