基于生产数据对120 t RH精炼低碳钢QD08(/%:≤0.07C,0.15～0.35Si,0.25～0.45Mn,≤0.035P,≤0.035S)进行了RH碳氧反应的热力学、动力学分析和自然脱碳分析,得出RH精炼自然脱碳的优化工艺。结果表明,BOF终点温度≥1650℃,RH初始温度≥1 ...基于生产数据对120 t RH精炼低碳钢QD08(/%:≤0.07C,0.15～0.35Si,0.25～0.45Mn,≤0.035P,≤0.035S)进行了RH碳氧反应的热力学、动力学分析和自然脱碳分析,得出RH精炼自然脱碳的优化工艺。结果表明,BOF终点温度≥1650℃,RH初始温度≥1 600℃,BOF终点[C]0.04%～0.10%,[P]≤0.018%,出钢前加顶浇石灰200 kg,出钢不加合金和脱氧剂,RH真空度4～8 kPa,6～8 min可使钢水[C]≤0.05%。展开更多
通过宝钢湛江炼钢厂350 t RH现场试验,解析了RH真空脱碳过程碳真空槽内压力和碳含量的变化规律,分析了RH真空槽内压力、铝升温操作、浸渍管内径和过剩碳含量等工艺参数对脱碳过程的影响。结果表明,脱碳开始3 min内,钢液中初始碳脱除率达...通过宝钢湛江炼钢厂350 t RH现场试验,解析了RH真空脱碳过程碳真空槽内压力和碳含量的变化规律,分析了RH真空槽内压力、铝升温操作、浸渍管内径和过剩碳含量等工艺参数对脱碳过程的影响。结果表明,脱碳开始3 min内,钢液中初始碳脱除率达50%以上,在正常条件下,12 min内碳可脱除至20×10-4%以内,15 min内碳可脱除至15×10-4%以内。同时经过试验,发现浸渍管内径越大,脱碳速率越大,RH结束碳越低。对原有的脱碳模型进行优化改造,提高了脱碳判断精度。展开更多
The reactions between CO_(2) gas and liquid Fe-C alloy with different initial carbon concentrations at 1873 K were investigated using experimental results,thermodynamic equilibrium,and kinetic analysis.The average CO_...The reactions between CO_(2) gas and liquid Fe-C alloy with different initial carbon concentrations at 1873 K were investigated using experimental results,thermodynamic equilibrium,and kinetic analysis.The average CO_(2) conversion is greater than 80%when the carbon content ranges from 4.0 to 1.0 wt.%.When the carbon content decreases from 0.5 to 0.1 wt.%,the average CO_(2) conversion diminishes from 83.50%to 40.84%.This proves that CO_(2) gas and liquid Fe-C alloy reaction does not reach equilibrium under experimental conditions compared with the calculated thermodynamic data.Through the kinetic analysis,it is shown that in the medium-to high-carbon liquid Fe-C alloys,the rate-controlling step involves CO_(2) gas mass transfer or mixed rate-controlling of CO_(2) gas mass transfer with adsorption and dissociation of CO_(2) gas.In contrast,in the low-carbon liquid Fe-C alloy,carbon mass transfer occurs in the molten alloy.The critical carbon content of the rate-controlling step transformation is 0.7937 wt.%.展开更多
基金support of the National Natural Science Foundation of China(Nos.51674021,52004023)Major Science and Technology Innovation Project of Shandong Province of China(No.2019JZZY010358).
文摘The reactions between CO_(2) gas and liquid Fe-C alloy with different initial carbon concentrations at 1873 K were investigated using experimental results,thermodynamic equilibrium,and kinetic analysis.The average CO_(2) conversion is greater than 80%when the carbon content ranges from 4.0 to 1.0 wt.%.When the carbon content decreases from 0.5 to 0.1 wt.%,the average CO_(2) conversion diminishes from 83.50%to 40.84%.This proves that CO_(2) gas and liquid Fe-C alloy reaction does not reach equilibrium under experimental conditions compared with the calculated thermodynamic data.Through the kinetic analysis,it is shown that in the medium-to high-carbon liquid Fe-C alloys,the rate-controlling step involves CO_(2) gas mass transfer or mixed rate-controlling of CO_(2) gas mass transfer with adsorption and dissociation of CO_(2) gas.In contrast,in the low-carbon liquid Fe-C alloy,carbon mass transfer occurs in the molten alloy.The critical carbon content of the rate-controlling step transformation is 0.7937 wt.%.
