ABSTRACT

The reaction mechanism of CO/CO₂ with low-carbon aluminium-killed molten steel in ladle furnace was investigated through thermodynamic analysis, simulation, and experiments. When a_[O]×a_[C] in molten steel is less than p_CO/(p^Θ × K^Θ_CO), CO/CO₂ gas is dissolved in the metal phase and decomposed into oxygen and carbon. When a_[O] × a_[C] is equal to or close to p_CO/(p^Θ × K^Θ_CO), CO no longer reacts with molten steel, part of CO₂ is decomposed to CO, and oxygen atoms selectively oxidise other elements. The experimental results showed that the CO reaction rate increases with an increase in the aluminium content in molten steel, whereas the opposite occurs for the decomposition rate of CO₂. The industrial test of the CO₂ bottom blowing was conducted in a 100 t LF. Compared with argon, the stirring effect was weakened, and carburisation and selective oxidation of the elements were noted.

摘要

通过热力学分析、模拟和实验研究了CO/CO ₂与低碳铝镇静钢水在钢包炉内的反应机理。当钢水中的a _[O] × a _[C]小于p _CO /( p ^Θ × K ^Θ _CO )时，CO/CO ₂气体溶解在金属相中并分解成氧和碳。当a _[O]  ×  a _[C]等于或接近p _CO /( p ^Θ × K ^Θ _CO)，CO不再与钢水反应，部分CO ₂分解为CO，氧原子选择性氧化其他元素。实验结果表明，随着钢水中铝含量的增加，CO反应速率增加，而CO ₂的分解速率则相反。_{CO 2}底吹的工业试验在 100 t LF 中进行。与氩气相比，搅拌效果减弱，并注意到元素的渗碳和选择性氧化。