关键词: 鲕状赤铁矿, 磁化焙烧, 弱磁选工艺, 难选铁矿石

Abstract: Magnetizing roasting is one of the effective ways to improve the comprehensive utilization of refractory iron ores. The factors influencing the magnetizing-roasting of an oolitic hematite ore were studied and the optimal conditions of the process of magnetizing roasting-low intensity magnetic separation were determined to be: 5% anthracite, 850 ℃ roasting temperature， 60 min roasting time， 70%-0.074 mm grinding size and 145.6 kA/m magnetic field intensity. At these optimal conditions, an iron concentrate grading 58.40% at an 87.86% iron recovery was obtained, with the sulfur content reaching the metallurgical requirement, which can be used as a component. However, it has a phosphorus content exceeding the standard, and a further study has to be made on its use as a direct metallurgical material.

Key words: Oolitic hematite, Magnetizing roasting, Low intensity magnetic separation, Refractory iron ore