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Influence of Al2O3 Level in CaO-SiO2-MgO-Al2O3 Refining Slags on Slag/Magnesia-Doloma Refractory Interactions

Journal Contribution - Journal Article

© 2019, The Minerals, Metals & Materials Society and ASM International. The influence of the Al 2 O 3 level in CaO-SiO 2 -MgO-Al 2 O 3 (CSMA) stainless steel refining slags on the degradation of magnesia-doloma refractories was investigated through static refractory finger corrosion tests. The tests were performed at 1620 °C under Ar atmosphere, using slags with Al 2 O 3 contents of 5, 10, and 20 wt pct, respectively. The results indicate that the formation of 2CaO·SiO 2 at the slag/refractory interface was suppressed by increasing the Al 2 O 3 content to 20 wt pct, thereby changing the corrosion mechanism from an indirect dissolution to a direct dissolution of CaO and MgO from the refractories. The increased solubility limit of MgO by the Al 2 O 3 -rich CSMA slags results in an overall higher corrosion rate of the MgO-doloma refractory.
Journal: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science
ISSN: 1073-5615
Issue: 4
Volume: 50
Pages: 1822 - 1829
Number of pages: 8
Publication year:2019