ABSTRACT

Blast furnace ironmaking usually requires maintaining a reasonable level of hot metal desulphurization; therefore, knowledge of the complex interplay between physical properties and desulphurization potential of slag is essential for the holistic approach to the operation. Several models for predicting sulphur partition between slag and hot metal based on sulphide capacity estimation have been studied in application to the Ukrainian blast furnace. Influence of an optical basicity, as well as of CaO/SiO₂ and MgO/Al₂O₃ ratios on sulphur partition between slag and hot metal, was analysed. Attainment of the equilibrium partition was estimated in connection with Si content in hot metal. International comparison of blast furnace slags was conducted involving data for 25 steelworks from 16 countries covering composition, physical properties and desulphurization potential. Approaches to optimization of slag composition are discussed, considering the tradeoff between enhancing slag’s desulphurization capacity and keeping its physical properties favourable to smooth and productive operation.

摘要

高炉炼铁通常需要保持合理的铁水脱硫水平；因此，了解矿渣的物理特性和脱硫潜力之间复杂的相互作用对于整体操作方法至关重要。基于硫化物容量估计的几种预测渣和铁水之间硫分配的模型已经在乌克兰高炉中进行了研究。光学碱度以及 CaO/SiO ₂和 MgO/Al ₂ O _3的影响分析了渣与铁水之间的硫分配比。平衡分配的实现与铁水中的 Si 含量有关。对高炉渣进行了国际比较，涉及来自 16 个国家的 25 家钢厂的数据，涵盖成分、物理特性和脱硫潜力。讨论了优化渣成分的方法，考虑了提高渣的脱硫能力和保持其物理性质有利于平稳和生产操作之间的权衡。