Corrosion Behavior of MgO–C Ladle Refractory by Molten Slag

Abstract

The damage of ladle refractory, which mainly occurs at the position of the slag line, results in an increasing need of maintenance and repair and can, in the worst case, lead to a breakout of melts causing potential risks for the personnel and damage of equipment. On the basis of this fact, the corrosion behavior of MgO–C refractory in contact with molten slag during the steel refining process is experimentally studied in this work. Rotating and static dipping tests of MgO–C refractory in CaO–SiO2–Al2O3–MgO–FeO slags are conducted, and the effects of composition of slag, carbon in refractory, and rotation speed on the corrosion behavior are investigated. Results show that the corrosion depth of the MgO–C refractory increases with FeO content of slag and rotation speed of MgO–C rod, whereas it decreases with an increase in slag basicity. Slag notably penetrates the surface layer of MgO–C refractory after the carbon is oxidized, causing an aggravation of the corrosion. Moreover, the corrosion mechanism of MgO–C refractory in molten slag during the refining process is studied and illustrated in this work.

Fundamental Research on Fluorine-Free Ladle Furnace Slag for Axle Steel of Electric Multiple Unit Vehicles

“…Magnesia-carbon (MgO-C) refractories are widely used in the ladle slag line. Therefore, the MgO content in the studied system should be controlled in the range of 6-10 wt.%, aiming to reduce the damage of the refining slag to the furnace lining during the refining process [30]. Furthermore, the influence of the MgO content on the meltability of the slag should be considered [31,32].…”

Analysis and Prediction of Sticker Breakout Based on XGBoost Forward Iterative Model

“…Sticker breakout usually forms near the meniscus, which is influenced by lubrication conditions 6,7) , molten steel composition 8,9) and mould powder 10) . On the other hand, external factors, such as manual operation and the change of casting speed, are also important triggers [11][12][13] .…”

Interface reaction between carbon composite brick and blast furnace slag

“…The corrosion reasons of ACCB were attributed to the dissolution of carbon from ACCB into iron and the promotion of the reaction between carbon and silica in ACCB by the appearance of iron. Other scholars [14][15][16][17][18] have also studied the corrosion of slag on refractory materials and their reaction behaviour, etc. To elaborate the effect of the slag-rich layer on the carbon brick in the hearth and its formation and evolution mechanism, the interface reaction between carbon composite brick and blast furnace slag was studied, and the wettability, microscopic morphology, phase components, and thickness of the reaction layer between the original/ modified brick and the slag with different basicities, MnO, CaF 2 , and FeO additions were analysed, respectively.…”