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

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