Lvping Fu

Corrosion Mechanism of Foamed Slag on the Lightweight Corundum-Spinel Castable

Development of lightweight linings for metallurgical furnaces is an important research direction in the development of refractory materials. In the steelmaking process, slag foaming is a common phenomenon, and it usually plays a positive role. However, because of the reactions between refractories and slag, the corrosion of wear lining refractories is not only related to the safety and stable operation of high-temperature furnaces but also affects steel quality. Foamed slag is likely to affect refractory corrosion, especially lightweight refractories containing lightweight porous aggregates. In this study, the slag corrosion experiments of lightweight corundum-spinel castable were performed in contact with the ordinary and foamed slag respectively and the foamed slag caused more serious corrosion to the lightweight corundum-spinel castable. Based on the corroded microstructure and Marangoni effect, slag corrosion mechanism was analyzed systematically, and could provide the basis for foamed slag resistance.