The red mud that was produced during the Bayer process in an aluminum oxide plant was taken as raw material in the test on iron recovery by using the process of reduction roasting-magnetic separation with coal powder as a reducing agent. Effects on recovery result by roasting temperature and time, amount of coal powder, dosage of additive agent as well as the magnetic field intensity were investigated. It is found that the optimum reaction parameters, including 60 min-roasting process at 1000 ℃, with the addition of coal powder at the amount of 15%, the CaO/ SiO2 ratio of 0.5, magnetic separation intensity at 0.1875 T(2.5 A), resulted in the concentrate approaching 44.85% Fe grade at 80.78% recovery, with 68.34% of gallium in raw material pulled into the magnetic material.%以氧化铝厂产生的拜耳法赤泥为原料,以煤粉为还原剂,采用还原焙烧-磁选法回收赤泥中的铁.研究了焙烧温度、焙烧时间、煤粉量、添加剂用量及磁场强度等因素对实验结果的影响,得到最优条件为:CaO/SiO2比0.5、煤粉添加量15%、1000℃ 下反应60 min,磁场强度0.1875 T(2.5 A)下磁选,铁回收率达到80.78%,精矿中铁品位为44.85%,原料中68.34%的镓进入磁性物质中.
展开▼
