关键词: 鲕状赤铁矿石, 悬浮焙烧, XRD, 磁选, 磁性

Abstract: Suspension roasting for an oolitic hematite from Hubei province was carried out to solve the long reduction time,uneven reducing,high energy consumption and high production costs of traditional magnetic roasting equipments and technology.The results show that an iron concentrate with iron grade of 58.32% and recovery of 85.69% can obtained under the conditions of material size of 80% passing 0.074 mm,gas velocity of 1.4 m/s,H₂ concentration of 40%,reduction temperature of 650 ℃ for 10 s,magnetic separation was brought after ground the roasted products at 90% passing 0.035 mm .The XRD analysis of roasted material show that hematite in ore can transformed to magnetite via suspension roasting.The magnetic analysis show that weakly magnetic iron mineral in oolitic hematite ore can rapidly transformed to magnetite during suspension roasting.The magnetization and magnetic susceptibility of reduced material were greatly increased.Suspension roasting has advantages of short roasting time,high heat utilization efficiency and large processing capacity,can transform the magnetic property of iron ore in a short time and provide a new approach for utilizing refractory iron ores.

Key words: Oolitic hematite ore, Suspension roasting, XRD, Magnetic separation, Magnetic property