There is large reserve of low grade and complex iron ore in China

which cannot be beneficiated by conventional physically-based beneficiation methods. High-efficiency utilization of these low grade iron ores is crucial to alleviate the supply shortage of iron ore in China on the one hand and to improve iron ore supply security on the other hand. Magnetizing roasting coupled with magnetic separation is an important method for the beneficiation of low grade iron ores and recently much attention has been paid to fluidized bed magnetizing roasting. In the present review

the principle of the magnetizing roasting method is first introduced

and then the status quo and existing problems of shaft furnace magnetizing roasting technology and rotary kiln magnetizing roasting technology are summarized. The development history and technical status of fluidized bed magnetizing roasting are also introduced

with the emphasis on summarizing the progress of the newly-developed low-temperature fluidized bed magnetizing roasting technology

including reduction intrinsic kinetics

process intensification

simulation and modeling

technology development like preheating of iron ore powder

feeding/discharging

roasted ore cooling and stable combustion of roasting off-gas. The application prospect of the technology is analyzed for low grade hematite

limonite

siderite and iron-containing tailings.