Degradation of MgO–C refractories corroded by SiO2–Fe2O3–V2O5–TiO2–MnO–MgO slag

Oxidation Resistance and Wetting Behavior of MgO-C Refractories: Effect of Carbon Content

“…The MgO-C refractory is subjected to extreme circumstances, including ultra-high temperature, severe convection, and oxidizing atmospheres, where it becomes damaged and its service life is shortened [2,3]. Many studies have investigated the mechanism of the degradation of MgO-C refractory in slag or slag-steel systems via stationary or rotary immersion methods [4,5,6]. Jansson et al [7] suggested that dissolution of the MgO into the slag was the first step in the corrosion of the MgO-C refractory, followed by penetration of the grain boundaries and dispersion of the grains in the slag.…”

Effect of MnO on High-Alumina Slag Viscosity and Corrosion Behavior of Refractory in Slags

“…The formation of Cr particles was due to the reaction between the carbon of refractory and Cr 2 O 3 of slag according to the reactions (4) and (5). 28) Han et al 29) investigated the degradation of MgO-C brick by SiO 2 -Fe 2 O 3 -V 2 O 5 -TiO 2 -MnO-MgO-Cr 2 O 3 slag, which indicated that the carbon with non-wettability by slag played an important role in the service life of MgO-C refractory and carbon oxidation as well as MgO dissolution were the main erosion mechanism. Sun et al 30) studied the wettability and reduction of MnO in slag by carbonaceous materials, indicating the poor wettability of graphite or coke by MnO-SiO 2 -CaO-Al 2 O 3 slag.…”

“…In fact, the surface tension of the slag also influences the corrosion of carbon composite brick and lower surface tension may lead to the brick more corrosive. 29) Due to the complex properties of the slag formed with the laterite ores, the effect of physical properties such as surface tension and wettability of the slag on the corrosion of refractory need to further investigated in the future.…”

Development of an Ultra-Low Carbon MgO Refractory Doped with α-Al2O3 Nanoparticles for the Steelmaking Industry: A Microstructural and Thermo-Mechanical Study

“…This effect has been mitigated since the development of magnesia-carbon (MgO-C) refractory in the 1970s, whereby the thermal properties of magnesia have been controlled and improved. A high thermal conductivity, excellent thermal shock resistance, as well as good corrosion resistance can be achieved in this kind of refractory [6][7][8][9][10][11][12][13]. Therefore, the mechanical and chemical properties exhibited by carbon-containing refractories have allowed them to be widely used to form specific compounds for certain applications in the steel industry.…”

“…Nevertheless, serious drawbacks can ensue with higher carbon content, such as (i) oxidation of carbon results in a highly porous structure with weak bonding, poor mechanical strength that allows easy penetration, and eventual corrosion by slag and molten steel; (ii) increased shell temperature; (iii) higher energy consumption originated by increased conductivity of the refractory; (iv) release of carbon dioxide or carbon monoxide gases; and (v) difficulty in precisely controlling the carbon content in steel [5,13,[16][17][18][19]. Certainly, the particular sensitivity of carbon with respect to oxygen is the major defect of MgO-C refractories.…”