Abstract: 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.

Key words: low grade iron ore, fluidization, magnetizing roasting, intrinsic kinetics, process intensification, simulation

摘要： 我国有大量常规选矿方法难以利用的铁矿石资源，实现其利用可增加我国铁矿石资源可利用量，缓解铁矿石供应紧张的局面，提高铁矿石供应安全的保障程度。磁化焙烧-磁选是难选铁矿石利用的重要方法，流态化磁化焙烧是近年来研究的热点。本文综述了磁化焙烧原理、竖炉及回转窑磁化焙烧的技术现状及存在问题，介绍了流化床磁化焙烧发展历史和研发现状，着重总结了低温流态化磁化焙烧在焙烧动力学、过程强化、反应器模拟、关键技术研发及产业化示范方面的研究进展，分析了其在褐铁矿、菱铁矿、赤铁矿及含铁尾渣利用方面的发展前景。

关键词: 难选铁矿, 流态化, 磁化焙烧, 本征动力学, 过程强化, 模拟