关键词: 鲕状高磷赤、褐铁矿, 回转窑, 磁化焙烧, 降磷

Abstract: The pilot tests ofΦ800 mm×9 000 mm rotary magnetic roasting are carried out for a Sichuan high phosphorus oolitic hematite-limonite ore. The new Pharmacy (LCP) which is developed by our own, was added into roasting process, leading to an ideal effect of phosphorus reduction. Through the tests, an integrated process condition was obtained as follows: roasting temperature at 1 000 ℃, roasting time at 45  min, coke content of 8%, coke size of -1 mm, pellet diameter of -30 +10 mm, LCP amount of 10%, first stage grinding fineness of -0.100 mm 100%, the weak magnetic field intensity B₁ = 0.30 T, second stage grinding fineness of -0.045mm more than 80%, the weak magnetic field strength B₂= 0.12 T. Under these conditions, a good index can be achieved with iron grade of 65.93%, phosphorus grade of 0.225%, iron recovery of 78.91%. The success of the process provides a new thought for development and utilization of high-phosphorus refractory iron ores.

Key words: High phosphorus oolitic hematite-limonite, Rotary kiln, Magnetic roasting, Phosphorus reduction