Influence of Ca2Mg2Al28O46 on the lightweight and corrosion resistance of corundum–spinel–calcium aluminate refractory

Following the comminution of the in-house synthesized Ca₂Mg₂Al₂₈O₄₆ (C₂M₂A₁₄), 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 C₂M₂A₁₄, 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 C₂M₂A₁₄ aggregate and cement materials to evaluate the influence of C₂M₂A₁₄ on the corrosion resistance of lightweight corundum–spinel–calcium aluminate refractories. The findings indicate that C₂M₂A₁₄ 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 C₂M₂A₁₄ is identified as the primary factor contributing to its resistance to corrosion from cement materials.