摘要
为探究直接还原铁新工艺并提高产品质量,以全铁含量为64.71%的某低硫磁铁精矿为原料,糊精为有机粘结剂,采用内配焦炭制备生球团,在氮气的保护下进行还原焙烧试验。结果表明:在焦炭用量为20%、还原温度为1150℃、还原时间为1 h、糊精添加量为1%、磨矿细度为-0.074mm占80%、磁场强度为80 kA/m的条件下,可获得全铁含量为92.67%的直接还原铁产品,此时铁回收率为95.74%;内配1.6%的碳酸钠后,直接还原铁产品的全铁含量达到93.55%,提升近一个百分点,而铁回收率降至94.20%。SEM-EDS分析显示直接还原铁产品晶粒较大,金属铁衍射峰明显,可作为电炉炼钢中替代废钢的优质原料。
In order to explore the new technology of direct reduction iron and improve product quality,carbon was added in a low sulfur magnetite concentrate with the total iron contents of 64.71%for the preparation of raw pellets and dextrin as organic binder.Then,the reduction roasting tests were carried out under the protection of nitrogen.The results showed that under the conditions of coke dosage of 20%,reduction temperature of 1150℃,reduction time of 1 h,dextrin addition of 1%,grinding fineness of-0.074 mm accounting for 80%and magnetic field intensity of 80 kA/m,direct reduced iron product with total iron contents of 92.67%and iron recovery rate of 95.74%was obtained.With the addition of 1.6%sodium carbonate,the total iron contents of the direct reduced iron product reached 93.55%,which increased by nearly one percentage point,and the iron recovery rate decreased to 94.20%.SEM-EDS analysis showed that the product has large grain size and obvious metal iron diffraction peak,which can be used as high quality raw material to replace scrap steel in electric furnace steelmaking.
作者
朱超波
黄自力
杨福
袁晨光
刘楚玉
黄涛
肖硕
ZHU Chaobo;HUANG Zili;YANG Fu;YUAN Chenguang;LIU Chuyu;HUANG Tao;XIAO Shuo(Key Laboratory of Hubei Province for High efficiency Utilization of Metallurgical Mineral Resources and Agglomeration,Wuhan 430081,China)
出处
《金属矿山》
CAS
北大核心
2022年第7期164-169,共6页
Metal Mine
基金
国家自然科学基金项目(编号:51872210)。
关键词
磁铁精矿
含碳球团
直接还原
碳酸钠
SEM-EDS
能谱分析
magnetite concentrate
carbon-containing pellets
direct reduction
sodium carbonate
SEM-EDS energy spectrum analysis