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Novel phenomenon of quasi‐volcanic corrosion on the alumina refractory‐slag‐air interface
Author(s) -
Zou Yongshun,
Huang Ao,
Gu Huazhi
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17394
Subject(s) - corrosion , refractory (planetary science) , metallurgy , materials science , slag (welding) , smelting , volcano , microstructure , geology , geochemistry
A novel phenomenon of quasi‐volcanic corrosion at refractory – slag – air interface under simulated normal smelting conditions was discovered when alumina refractory came in contact with CaO‐Al 2 O 3 ‐SiO 2 slags and soaked at 1600°C. Based on thermodynamic and microstructure analysis, the mechanism of quasi‐volcanic corrosion was revealed and the effect of CaO/SiO 2 mass ratio (C/S ratio) on corrosion was discussed. The results indicate that a two‐stage intensified convection led to the severe upwelling corrosion of the refractory at the triple‐phase interface. Furthermore, the critical intensity of the corrosive convection at the first stage on the formation of “slag volcano” was determined. This can serve as guidance for prolonging the service life of alumina refractory.