5500 m^(3)高炉低渣比冶炼下的炉渣黏度试验与分析  

Test and analysis of slag viscosity for 5500 m^(3) blast furnace under low slag ratio ironmaking

作　　者：李宏伟 陈艳波 霍吉祥 纪鹏飞 郭宏烈 邓勇 LI Hongwei;CHEN Yanbo;HUO Jixiang;JI Pengfei;GUO Honglie;DENG Yong(Ironmaking Department,Shougang Jingtang Iron&Steel Co.,Ltd.,Tangshan 063200,Hebei,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China)

机构地区：[1]首钢京唐钢铁联合有限责任公司炼铁部,河北唐山063200 [2]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《中国冶金》2024年第9期95-102,共8页China Metallurgy

摘　　要：某大型钢铁公司5 500 m^(3)高炉采用高比例球团冶炼后,渣铁比由300 kg/t左右下降到220 kg/t左右,也带来了高炉脱硫能力减弱、铁水中硫升高、炉渣排碱能力下降等问题。根据5 500 m^(3)高炉渣系特点,通过试验研究低渣比条件下炉渣中的碱度、MgO、Al_(2)O_(3)、MnO、TiO_(2)及温度对炉渣黏度性能的影响,从而为高炉生产提供更好的技术支撑。结果表明,炉渣碱度升高,液相线温度升高,但当温度高于1 375℃后,炉渣黏度随着碱度的升高呈现逐渐降低的趋势,且温度越高碱度对黏度影响程度越大;随着MgO含量增加,黏度呈现逐渐降低的趋势,但液相线温度变化不大;随着Al_(2)O_(3)含量升高,黏度呈现升高趋势,且当Al_(2)O_(3)质量分数升至16%以上时,黏度显著升高,而液相线温度随着Al_(2)O_(3)含量的增加而升高;随着镁铝比升高,熔化性温度下降,炉渣黏度呈降低趋势,但在同等镁铝比条件下,低铝的炉渣性能更佳;MnO质量分数在1.0%以下时,炉渣的黏度随着MnO含量的增加而逐渐降低;TiO_(2)质量分数在5%以下时,炉渣的黏度随着TiO_(2)含量的升高呈下降趋势。此外,通过对3座高炉现场渣样分析,证实炉渣黏度控制在0.30~0.50 Pa·s时,炉渣具有较好的性能,且炉渣黏度越低越能获得较好的经济指标。The slag-iron ratio decreased from about 300 kg/t to 220 kg/t after high pellet ratio ironmaking was used in a 5 500 m^(3) blast furnace of a large iron and steel company, which also brought about some problems, such as weakened desulphurization capacity of blast furnace, increased sulfur in hot metal and decreased alkali metals discharge capacity of slag. Based on the characteristics of 5 500 m^(3) blast furnace slag, the effects of basicity, MgO, Al_(2)O_(3), MnO, TiO_(2) and temperature on viscosity properties of blast furnace slag at low slag ratio were studied experimentally, so as to provide better technical support for blast furnace production. The results show that as the basicity of slag increases, the liquidus temperature increases. However, when the temperature exceeds 1 375 ℃, the viscosity of the slag gradually decreases with the increase of basicity, and the higher the temperature, the greater the impact of basicity on viscosity. The viscosity decreases gradually with the increase of MgO content, but the liquidus temperature does not change much. With the increase of Al_(2)O_(3) content, the viscosity shows an increasing trend, and when the mass fraction of Al_(2)O_(3) is higher than 16%, the viscosity increases significantly, and the liquidus temperature increases with the increase of Al_(2)O_(3) content. With the increase of Mg-Al ratio, the melting temperature decreases and the slag viscosity decreases, but under the same Mg-Al ratio, the slag with low aluminum has better performance. When the mass fraction of MnO is below 1.0%, the viscosity of slag decreases with the increase of MnO content. When the mass fraction of TiO_(2) in slag is below 5%, the viscosity tends to decrease with the increase of TiO_(2) content. In addition, through the analysis of three blast furnace slag samples, it is proved that the slag has good performance when the slag viscosity is controlled at 0.30-0.50 Pa·s, and the lower the slag viscosity, the better economic index can be obtained.

关 键 词：高炉 低渣比 冶炼 炉渣 黏度 

分 类 号：TF54[冶金工程—钢铁冶金]