采用焦丁改善高炉高比例块矿冶炼的研究与实践  

RESEARCH AND PRACTICE ON IMPROVING HIGH-PROPORTION LUMP ORE SMELTING IN BLAST FURNACE WITH COKE NUT

作　　者：刘雪伟[1] 王德全 佘雪峰[1] 王京彬 郭泽浩 李丽红 Liu Xuewei;Wang Dequan;She Xuefeng;Wang Jingbin;Guo Zehao;Li Lihong(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083;Hebei Hot Rolled Strip Technology Innovation Center,Xingtai 054009,Hebei;Delong lron and Steel Co.,Ltd.,Xingtai 054009,Hebei)

机构地区：[1]北京科技大学绿色低碳钢铁冶金全国重点实验室,北京100083 [2]河北省热轧板带钢技术创新中心,河北邢台054009 [3]德龙钢铁有限公司,河北邢台054009

出　　处：《河北冶金》2024年第10期28-33,共6页Hebei Metallurgy

基　　金：国家自然科学基金资助项目(U1960205)。

摘　　要：针对高炉在高比例块矿条件下高炉透气性变差和炉料熔滴性能下降的冶炼问题,通过试验室软化熔滴实验,采用添加不同比例焦丁和不同装料方式,获得了矿焦混装时炉料的软熔温度区间及透气性特征指数。结果表明,增加焦丁后,炉料的透气性大幅增加,当焦丁比例达到10%时,透气性得到较大改善。焦丁与球团矿混装或者焦丁分级与球团矿混装可以进一步改善炉料结构的透气性,但块矿比例达到20%时,综合炉料的透气性变差。生产实践表明,在块矿比例从14%增加到18%的过程中,焦丁添加量从30 kg/tHM高到至60 kg/tHM,高炉压差能够稳定保持在142 kPa左右。当高炉综合块矿比为18%,球团矿与焦丁混合装料时,设置焦丁装入量为50 kg/tHM,高炉压差基本在133~138 kPa,煤气利用率>44%。In response to the smelting issues of blast furnaces under high proportion lump ore conditions,such as decreased permeability and reduced melt dripping performance of the burden,this paper employs laboratory softening and melting dripping experiments.By adding different proportions of coke nuts and using different charging methods,the soft melting temperature range and permeability characteristic index of the burden during coke and ore mixing were obtained.The results indicate that the permeability of the burden increases significantly after the addition of coke nuts,with a notable improvement when the proportion of coke nuts reaches 10%.Mixing coke nuts with pellet ore or stratified mixing of coke fines with pellet ore can further improve the permeability of the burden structure.However,when the lump ore ratio reaches 20%,the permeability of the comprehensive burden deteriorates.The production practice shows that in the process of increasing the lump ore ratio from 14%to 18%,the addition of coke nuts is as high as 30 kg/tHM to 60 kg/tHM,and the pressure difference of the blast furnace can be stably maintained at about 142 kPa.When the pellets are mixed with coke,the ratio of the blast furnace is 18%,the loading capacity of coke is 50 kg/tHM,the pressure difference of the blast furnace is basically between 133 kPa~138 kPa,and the gas utilization rate is more than 44%.

关 键 词：高炉 焦丁 炉料结构 块矿 矿焦混装 熔滴性能 

分 类 号：TF542[冶金工程—钢铁冶金]