This study presents a new lightweight periclase-magnesium alumina spinel castable (LPSC) for the working lining of steel ladles using porous periclase-spinel aggregates to replace conventional dense magnesia aggregates. The porous periclase-spinel aggregates were produced by an in-situ decomposition technique resulting in an apparent porosity of 23.3% and a median pore size of 5.66 μm. Scanning electron microscopy revealed a better porous aggregate/matrix interface bonding in the LPSC, which significantly improved its strength and thermal shock resistance. Additionally, the higher amount of micropores of the porous aggregates in the LPSC absorbed more penetrated slag from the matrix, which enhanced the slag resistance. Thus, compared with conventional castables, the LPSC had a lower bulk density of 9.2–10.8% and a lower thermal conductivity of 18.8% (1000 °C) while at the same time a higher strength, thermal shock resistance and slag resistance was achieved.

这项研究提出了一种新的轻质钙镁铝镁尖晶石浇铸料（LPSC），用于钢包的工作衬里，使用多孔钙镁石-尖晶石骨料代替常规的致密氧化镁骨料。多孔周长石-尖晶石聚集体通过原位分解技术生产，表观孔隙率为23.3％，中位孔径为5.66μm。扫描电子显微镜显示，LPSC中具有更好的多孔聚集体/基质界面结合，从而显着提高了其强度和抗热震性。另外，LPSC中较高数量的多孔聚集体微孔从基体吸收了更多的熔渣，从而增强了抗渣性能。因此，与传统的浇注料相比，LPSC的堆积密度较低，为9.2-10.8％，导热系数较低，为18。