高铝低硅CaO-Al2O3系熔渣对刚玉/六铝酸钙质浇注料的作用行为

摘要：由于高铝低硅CaO-Al2O3系熔渣对耐火材料的侵蚀损毁影响高铝含量低密度高强钢的安全冶炼生产，为此通过在刚玉质浇注料中引入六铝酸钙，开展六铝酸钙质浇注料与高铝低硅CaO-Al2O3系熔渣反应实验，并与铝镁浇注料进行对比研究了其作用行为。实验结果表明：刚玉 六铝酸钙浇注料具有优异抗渣性能。这主要是由于熔渣中大量的CaO被消耗，间接提高了熔渣黏度，并与刚玉 六铝酸钙浇注料反应生成的高熔点相CA2填充了气孔，阻挡了熔渣的渗透，实验结果与热力学模拟计算结果相吻合。六铝酸钙浇注料自身气孔率高，熔渣主要以渗透形式对六铝酸钙耐火材料造成破坏。因此，将刚玉骨料与六铝酸钙基质组合是有望成为低密度高强钢冶炼用钢包内衬候选耐火材料。

Corrosion behavior of high alumina and low silicon CaO Al2O3 slags on corundum/calcium hexaaluminate based castables

Abstract： Due to the corrosion of CaO-Al2O3 based slags on refractory materials is related to the safe smelting of low-density and high-strength steel with high aluminum, the reaction experiment of calcium hexaaluminate castables with high-alumina and low-silicon CaO-Al2O3 based slag was carried out by introducing calcium hexaaluminate into corundum castables, and it was compared with that of alumina magnesia castable. The experimental results agreed with that of thermodynamic simulation and show that corundum calcium hexaaluminate castable has excellent slag resistance. Because the corundum calcium hexaaluminate castable reacted with the CaO Al2O3 based slag and produced high melting point phase CA2, which consumed a large amount of CaO in the slag and increased the viscosity of the slag, and CA2 filled the pores and blocked the penetration of slag. The wear mechanism of the calcium hexaaluminate castable is slag infiltration due to the higher porosity. Therefore, the combination of corundum aggregates and calcium hexaaluminate matrix is expected to be a candidate refractory material for ladle lining of low density and high strength steel smelting.