转炉中石灰石分解产生的CO_2对铁水的氧化作用  

The effect of CO_2 oxidation on hot metal arising from CaCO_3 decomposition in BOF

作　　者：鲁华[1,2] 李晨晓[1,2] 毛文文 李宏[1,2] LU Hua LI Chenxiao MAO Wenwen LI Hong(State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China Metallurgical and Ecological Engineer School, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《炼钢》2017年第1期49-55,共7页Steelmaking

摘　　要：石灰石在转炉炼钢前期分解产生大量的CO_2,以吨钢消耗85 kg石灰石计算,每吨钢释放35 kg CO_2。石灰石分解产生的CO_2不仅能够增强转炉铁水的搅拌作用,而且能够与铁水中元素发生反应增强前期供氧。在热力学计算CO_2与铁水相互作用的基础之上,在实验室条件下,向铁水中投入石灰石颗粒,通过分析检测反应过程中铁水中[C]、[Si]、[Mn]成分的变化来验证石灰石分解产生的CO_2和铁水的相互作用。试验结果表明随着石灰石在铁水表面分解进行,铁水中[C]、[Si]、[Mn]含量不断降低,而且在不同的铁水温度条件下,CO_2和铁水中各元素反应的优先性不同。CO_2和铁水反应的利用率随着温度和搅拌强度的升高而升高,总体在25.5%~65.3%变化。Large amounts of CO2 are produced by CaCO3 decomposition in the early stage of BOF steelmaking. Assuming that 85 kg limestone is consumed per ton of steel,35 kg CO2 will be generated. CO2 can not only enhance the mixing effect of hot metal,but also react with molten iron element. On the basis of thermodynamic calculation of CO2 interacting with hot metal,limestone particles were put in hot metal under laboratory conditions. Interaction between CO2 and hot metal was verified by detecting the change of [C],[Si]and [Mn] content in hot metal. Experiment results showed that [C],[Si] and [Mn] content continuously reduced with the CaCO3 decomposition in hot metal. As the temperature and stirring intensity rised,the utilization rate of CO2 increased and changed between 25. 5 %- 65. 3 %.

关 键 词：石灰石 铁水 石灰石分解 氧化优先性 CO2利用率 

分 类 号：TF713[冶金工程—钢铁冶金]