摘要：稀土钢连铸过程中，结晶器内上浮至渣金界面的高熔点稀土夹杂物如果不能被保护渣有效的溶解吸收，进入保护渣后会改变渣的理化性能，影响连铸顺行。通过高温实验研究了CeAlO3在连铸保护渣中的溶解机制，探究了保护渣w(CaO)/w(Al2O3)（简写为C/A）对溶解过程的影响。实验结果表明，CeAlO3溶解过程中，夹杂物渣界面会形成Ce3+和Ca2+的浓度边界层。在C/A为0.8的保护渣中会形成中间产物CaCeAl3O7，随着C/A增加到1.0，中间产物CaCeAl3O7减少；继续增加C/A至1.2，中间产物消失。其溶解机制为，低C/A渣中AlO5-4较多，在浓度边界层中CeAlO3溶解形成的Ce3+与渣中Ca2+、AlO5-4反应生成中间产物CaCeAl3O7，然后中间产物再向渣中溶解，溶解方式为间接溶解。高C/A渣中AlO5-4较少，不足以达到固相形核浓度而形成中间产物，CeAlO3通过离子扩散溶解于渣中。因此，当保护渣C/A低于或等于1，CeAlO3在渣中的溶解方式为间接溶解，当保护渣C/A超过1时，CeAlO3在渣中的溶解方式转变为直接溶解。

Abstract： During the continuous casting of rare earth steel, the rare earth inclusions with high melting points will float to the slagsteel interface in the mold. If these inclusions cannot be effectively dissolved and absorbed by the mold flux, the physicochemical properties of the slag will be changed and the continuous casting process will be affected consequently. The dissolution mechanism of CeAlO3 in the slag and the effect of w(CaO)/w(Al2O3) (abbreviated as C/A) on the dissolution process was investigated through hightemperature experiments. The experimental results show that a concentration boundary layer of Ce3+ and Ca2+ is formed at the inclusionsslag interface during the dissolution of CeAlO3. The intermediate product CaCeAl3O7 is formed in the mold flux when C/A is 0.8 and as the C/A ratio increases to 1.0, the intermediate product CaCeAl3O7 decreases, but when C/A continues to increase to 1.2, the intermediate product disappears. The dissolution mechanism is that there are more AlO5-4 in low C/A slag, and the Ce3+ formed by the dissolution of CeAlO3 in the concentration boundary layer reacts with Ca2+ and AlO5-4 in the slag to generate the intermediate product CaCeAl3O7. Then the intermediate product dissolves into the slag again. The dissolution method is indirect dissolution. There is less AlO5-4 in high C/A slag, which is not enough to reach the solid phase nucleation concentration and form the intermediate product, and CeAlO3 is dissolved in the slag by ionic diffusion. Therefore, when the C/A is lower than or equal to 1, the dissolution method of CeAlO3 in the slag is indirect dissolution. The dissolution method of CeAlO3 in the slag changes to direct dissolution when the C/A is more than 1.