Enhanced corrosion resistance of MgO-C refractories containing sintered MgAl2O4 spinel powder under various slag basicities

Under the requirements of low-carbon metallurgy and high scrap ratio technology, enhancing the slag corrosion resistance of MgO-C refractories through cost-effective methods holds significant importance. Therefore, sintered spinel fine powder was used to partially replace the original fused magnesia fine powder in the refractory matrix, and the slag corrosion resistance against high-basicity and low-basicity slags was studied using the induction furnace corrosion test. The results showed that the addition of sintered spinel fine powder significantly enhanced the slag resistance of refractory matrix, especially against low-basicity slag. It also suppressed the propagation of the corroded area at the matrix, preventing complete destruction of the matrix and subsequent spalling of the aggregates caused by slag flow. Additionally, it inhibited the penetration of the slag into the refractory matrix and reduced the concentration of Fe3 + in the slag. When 12 wt% of sintered spinel fine powder was used, the specimens exhibited the best slag corrosion resistance against both slags with different basicities.