细粒级铁精矿制备熔剂性球团  

Preparation of fusible pellets from fine-grained iron ore concentrates

作　　者：温宝良 张晓萍 李家新[1] 吴宏亮 杨佳龙 WEN Bao-liang;ZHANG Xiao-ping;LI Jia-xin;WU Hong-liang;YANG Jia-long(School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Technical Center,Maanshan Iron and Steel Co.,Ltd.,Maanshan 243003,Anhui,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032 [2]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243003

出　　处：《钢铁》2023年第10期23-33,共11页Iron and Steel

基　　金：国家自然科学基金资助项目(U1860113);。

摘　　要：目前对细粒级铁精矿球团化的研究主要聚焦于生产酸性球团,为进一步提高细粒级铁精矿工业应用力度,缓解球团生产资源压力,对不同方法下使用细粒级铁精矿制备熔剂性球团进行了研究。结果表明,以细粒级铁精矿为原料、碱度为0.8~1.2、膨润土搭配石灰石所制备的熔剂性球团具有更好的生球质量,生球落下强度为7.3次/0.5 m、抗压强度为16 N/个,而以消石灰为黏结剂与助熔剂制备的生球,则需要碱度大于1.0时其生球质量才满足生产标准。细粒级铁精矿添加膨润土和石灰石的熔剂性球团要比仅添加消石灰的熔剂性球团的干燥完成时间长,两者干燥完成时间分别为360 s和270 s,基于模型拟合结果,仅添加消石灰的熔剂性球团表现出了更高的水分传质系数和水分扩散系数,毕渥数Bi值小于0.1,干燥过程中生球内部温度分布会趋向不均匀。无论是以膨润土还是消石灰作为黏结剂生产细粒级精矿熔剂性球团时,均需要较高的焙烧温度才可以促进赤铁矿间形成大片连晶,焙烧温度为1250℃时,膨润土搭配石灰石球团强度为3656 N/个,消石灰球团强度为3398 N/个,碱度为0.8~1.2,相比于添加膨润土和石灰石,仅添加消石灰的细粒级铁精矿熔剂性球团会稍降低球团还原度,但是可以改善球团的还原膨胀与还原粉化,2种方法所制备的细粒级铁精矿熔剂性球团均具有良好的冶金性能。The current research on the pelletization of fine-grained iron ore concentrate mainly focuses on the production of acidic pellets.To further improve the industrial application of fine-grained iron ore concentrate and to relieve the resource pressure of pellet production,the preparation of fusible pellets using fine-grained iron ore concentrate under different methods was investigated.The results show that:the fusible pellets prepared from fine-grained iron ore concentrate with 0.8-1.2 alkalinity and bentonite with limestone have better pellet quality,with a drop strength of 7.3 times/0.5 m and compressive strength of 16 N/pc,while the pellets prepared with slaked lime as binder and flux require an alkalinity greater than 1.0 to meet the production standard.Based on the model fitting results,the molten pellets with bentonite and limestone added to the fine-grained iron ore concentrate had a longer drying completion time than the molten pellets with slaked lime only,which were 360 s and 270 s.Based on the model fitting results,the molten pellets with slaked lime only had a higher water transfer and diffusion coefficient with Bi value less than 0.1,and the temperature distribution inside the raw pellets tended to be uneven during the drying process.Whether bentonite or slaked lime is used as binder for the production of fine-grained concentrate fusible pellets,a higher roasting temperature is required to promote the formation of large continuous crystals between hematite ores,and the strength of bentonite pellets with limestone is 3656 N/pc and slaked lime pellets is 3398 N/pc at a roasting temperature of 1250℃.At 0.8-1.2 alkalinity,compared to the addition of bentonite and limestone,the addition of slaked lime only The fine-grained iron ore concentrate fusible pellets with slaked lime will slightly reduce the pellet reduction,but can improve the reduction swelling and reduction pulverization of the pellets,and the fine-grained iron ore concentrate fusible pellets prepared by both methods have good metallurgical p

关 键 词：细粒级铁精矿 熔剂性球团 生球质量 干燥特性 预热焙烧 冶金性能 

分 类 号：TF046.6[冶金工程—冶金物理化学]