Influence of Ca ₂ Mg ₂ Al ₂₈ O ₄₆ on the lightweight and corrosion resistance of corundum–spinel–calcium aluminate refractory

Abstract Following the comminution of the in‐house synthesized Ca 2 Mg 2 Al 28 O 46 (C 2 M 2 A 14 ), it was utilized as an aggregate in the formulation of lightweight corundum–spinel–calcium aluminate refractories. The performance of the lightweight refractory, produced with varying particle sizes and proportions of C 2 M 2 A 14 , was systematically evaluated through phase composition analysis, microstructural observations, and thermodynamic calculations. Furthermore, an investigation was conducted on the corrosion behavior of various phases within the in‐house synthesized C 2 M 2 A 14 aggregate and cement materials to evaluate the influence of C 2 M 2 A 14 on the corrosion resistance of lightweight corundum–spinel–calcium aluminate refractories. The findings indicate that C 2 M 2 A 14 undergoes further decomposition during the firing process, resulting in a decrease in the bulk density of the refractory. Moreover, the presence of calcium aluminate phases within C 2 M 2 A 14 is identified as the primary factor contributing to its resistance to corrosion from cement materials.