Reaction mechanisms between slag and Ti(C,N)-MgAl2O3-Al2O3 refractories at 1600 °C

In this paper, Ti(C,N)-MgAl2O4-Al2O3 refractories were prepared by heat-treating resin bonded Al-TiO2-MgO-Al2O3 refractory at 1500 degrees C with N-2 blowing, and the effect of Ti(C,N) on the corrosion resistance of the refractory was investigated by comparison with Al-MgO-Al2O3 refractory at 1600 degrees C. The results show that Ti(C,N) particles are formed in the Ti(C,N)-MgAl2O4-Al2O3 refractory by the carbon formed from resin as a precursor, which is continuously distributed in the matrix of the refractory. When the refractory is in contact with molten slag at 1600 degrees C, the continuously distributed Ti(C,N) absorbs [TiO2] in the slag and exists stably as Ti(C,N,O), thereby reducing the corrosion depth of the refractory. After corrosion, the boundary between the Ti (C,N)-MgAl2O4-Al2O3 refractory and the slag is clear, and the slag composition includes spinel, Ti(C,N,O) and gehlenite. Additionally, the heated Al-MgO-Al2O3 refractory shows poor corrosion resistance due to the oxidation of non-oxides such as Al4O4C and AlN.