石灰快速溶解对强化转炉前期脱磷、实现少渣冶炼、降低渣中f-CaO含量具有重要作用。转炉一般采用活性石灰来强化成渣过程，但终渣中仍存在＞5%的f-CaO。在CaO-SiO2-FetO基体系中石灰-熔渣界面上形成的C2S不仅抑制了石灰的溶解，而且会改变石灰在高温下的微观结构，进而影响石灰的进一步溶解。转炉采用活性石灰造渣是否为最佳选择？若利用具有一定生烧率的石灰快速分解析出的CO2来破坏石灰-熔渣界面C2S层以促进石灰的溶解，那么石灰-熔渣界面结构和石灰微观组织的演变规律是什么？为此，本项目研究在转炉冶炼条件下石灰微观结构的变化行为，明确CaO晶体长大的动力学机理；研究石灰性质、熔渣成分及气泡等因素对石灰-熔渣界面结构的影响，揭示石灰微观组织的演变规律及其溶解过程限制性环节的转变机理，获得CaO-SiO2-FetO体系中石灰溶解速率的调控机制，为炼钢工艺选择合适结构的石灰进行造渣提供理论参考。

The rapid dissolution of lime plays an important role in the dephosphorization, the less-slag steelmaking process and the content of f-CaO in steelmaking slags. Although the reactive lime is used to strengthen the slag-forming rate in BOF at present, the solid slag still contains > 5% f-CaO. The formation of C2S on the lime-slag interface in the CaO-SiO2-FetO system not only inhibits the dissolution of lime, but also will change the microstructure of lime, which will affect the further dissolution of lime. Is it the best choice to use the reactivity lime to make slag in BOF? If CO2 released through the rapid decomposition of lime with a certain content of CaCO3 is used to destroy the C2S layer of the lime-slag interface to promote the dissolution of lime, then what are the evolution behaviors of the lime-slag interface structure and the lime microstructure? Therefore, the project studies the changing behavior of lime microstructure under the condition of the BOF process and clarifies the kinetic mechanism of CaO crystal growth. The effects of lime properties, slag composition and bubbles on the properties of lime-slag interface are investigated to explore the evolution behavior of the lime microstructure and the transformation mechanism of the controlling steps of lime dissolution, so as to obtain the regulating mechanism of lime dissolution rate in CaO-SiO2-FetO system. The results can provide theoretical reference for selecting suitable lime for slag making in steelmaking process.