ABSTRACT

The dissolution behaviours of lime, limestone and lime sample with limestone core-lime shell structure in CaO–SiO₂–FeO_x slag were investigated. The results show that dissolution of lime slows down once 2CaO·SiO₂ layer is formed at slag/lime interface. Self-disintegrating effect produced by decomposition of limestone core can accelerate dissolution, but dissolution rate firstly increases, and then decreases with the CaCO₃ content of samples increasing. Limestone must decompose to form lime before dissolution, and too much CO₂ generated by decomposition of limestone bearing 98.9 wt% CaCO₃ blocks the contact between molten slag and lime layer. Thus, limestone hardly dissolves after 60s contacted with molten slag. For lime sample with core–shell structure, the surface of sample is lime layer that can be directly dissolved in molten slag. Meanwhile, self-disintegrating effect produced by decomposition of limestone core enhances slag penetration, and accelerate dissolution. The optimum CaCO₃ content in lime sample is 22.7 wt%.

摘要

研究了石灰、石灰石和具有石灰石核-石灰壳结构的石灰样品在CaO-SiO ₂ -FeO _x渣中的溶解行为。结果表明，一旦渣/石灰界面形成2CaO·SiO ₂层，石灰的溶解速度就会减慢。石灰岩核分解产生的自崩解作用可以加速溶解，但溶解速率随着样品CaCO ₃含量的增加先增大后减小。石灰石在溶解前必须分解形成石灰，石灰石分解产生过多的CO _{2 ，​​含98.9 wt% CaCO 3}阻止熔渣和石灰层之间的接触。因此，石灰石与熔渣接触60秒后几乎不溶解。对于核壳结构的石灰样品，样品表面是石灰层，可以直接溶解在熔渣中。同时，石灰岩核心分解产生的自崩解作用增强了渣的渗透，加速溶解。石灰样品中CaCO ₃的最佳含量为22.7 wt%。