Steel inclusion prediction in ladle treatment

提出了在生产的关键钢包精炼阶段建立并验证钢中夹杂物（铝酸镁尖晶石和铝酸钙）转变的动力学模型。这项工作建立在先前工作的基础上，其中开发了钢包中金属和炉渣成分的动力学模型，并为生产规模的钢包冶金处理站进行了验证。该数学模型基于Al、Mg、O、S和Ca在钢中的输运控制扩散，并假设在夹杂物-金属界面处达到平衡。界面上的平衡是用从以前使用的炉渣热化学计算中改编的细胞模型计算的。以生产试验形式进行的合作实验将在安赛乐米塔尔的钢包冶金设施中进行。将取钢中的金属、炉渣和夹杂物样品来验证模型。电子显微镜将用于比较成分与计算。钢包冶金是浇注前控制钢和夹杂物化学的最后机会，对生产高质量钢至关重要。目前，还没有模型可以预测整个钢包冶金热过程中渣、金属和夹杂物化学发展的动力学。预计这将立即用于加拿大钢铁生产商，以生产在全球竞争的高质量钢铁。

It is proposed to develop and validate a kinetic model for inclusion transformation (both magnesium aluminate spinels and calcium aluminates) in steels during the critical ladle refining stage of production. This work builds on previous work in which a kinetic model for metal and slag composition in steel ladles was developed and verified for a production scale steel ladle metallurgy treatment station. The mathematical model is based on transport-controlled diffusion of Al, Mg, O, S, and Ca in the steel and assumes equilibrium at the inclusion-metal interface. Equilibrium at the interface is calculated with a cell model adapted from previously used slag thermochemical calculations. Collaborative experiments in the form of production trials will be conducted in the ladle metallurgy facilities of ArcelorMittal. Samples of metal, slag and inclusions in the steel will be taken for validation of the model. Electron microscopy will be used to compare the compositions with the calculations. Ladle metallurgy is the last opportunity to control the steel and inclusion chemistry before casting, so it is vital to the production of high quality steel. Currently, there are no models that predict the kinetics of slag, metal and inclusion chemistry development throughout a ladle metallurgy heat. This is expected to be of immediate use to Canadian steel producers to produce high-quality steel that competes on a global basis.