细粒级镜铁矿造球-磁化焙烧试验研究

Experimental Study on Pelletizing and Magnetization Roasting Process for Fine-Grained Specularite

对细粒级镜铁矿进行造球-磁化焙烧工艺研究,考察造球工艺以及球团在磁化焙烧过程的焙烧性能及效果。结果表明:采用细磨造球-磁化焙烧工艺,还原剂外配,在焙烧温度810℃、焙烧时间60 min、煤粉用量2.5%条件下磁化焙烧,精矿铁品位49.04%、回收率76.99%;采用直接造球-磁化焙烧工艺,还原剂外配,在焙烧温度650℃、焙烧时间60 min、兰炭用量3.0%条件下磁化焙烧,可获得精矿铁品位52.95%、回收率85.07%的较好指标。直接造球-磁化焙烧工艺简单,可获得更好的选矿指标,为细粒级镜铁矿磁化焙烧现场应用提供依据。

An experiment was carried out with a pelletizing and magnetization roasting process for fine-grained specularite to investigate the pelletizing process,as well as the roasting performance and effect of pellets in the process of magnetization roasting.The results show that by adopting a process of fine grinding and pelletizing followed by magnetization roasting with an additionally prepared reducing agent,under the condition of roasting at 810℃for 60 min,and addition of charcoal at an amount of 2.5%,a concentrate grading 49.04%Fe at 76.99%recovery can be obtained.In comparison,with a process of direct pelletizing followed by 60 min magnetization roasting at 650℃with additionally prepared reducing agent and addition of semi-coke at an amount of 3.0%,the concentrate grading 52.95%Fe at 85.07%recovery can be obtained.It is found that the processing technique consisting of direct pelletizing and magnetization roasting is simpler and can bring better processing indicators.It can provide a reference for on-site processing of fine-grained specularite by adopting magnetizing roasting.