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Abstract
The influence of the Al2O3 level in CaO-SiO2-MgO-Al2O3 (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 Al2O3 contents of 5, 10, and 20 wt pct, respectively. The results indicate that the formation of 2CaO·SiO2 at the slag/refractory interface was suppressed by increasing the Al2O3 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 Al2O3-rich CSMA slags results in an overall higher corrosion rate of the MgO-doloma refractory.
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