Abstract
In this study, a process of magnetizing roasting followed by low-intensity magnetic separation, which is used to separate and recover iron from low-grade refractory iron ore, was investigated. In addition, the ore is crushed and divided into different sizes and put into the electric rotary kiln at different times to participate in reduction reaction. The optimum magnetizing roasting conditions were obtained as the following: roasting at 800 ℃ for 30 min, mass ratio of lignite to iron ore of 5/1000, and grinding 12 min of roasted samples. Under the optimum roasting conditions, the two main parameters of the recovery process of magnetically separated concentration were obtained as the following: the grade of magnetic concentrate of 61.6 mass% Fe and iron minerals recovery rate of 87.5%. The results could be useful for comprehensive utilization of low-grade refractory iron ore by magnetizing roasting process.KeywordsMagnetizing roastingMagnetic separationLow-grade iron oreIron recovery
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