The invention discloses an efficient short-process magnetizing
roasting combined treatment method for
iron ore, and belongs to the field of
mineral processing engineering. The method comprises the following steps: crushing and screening the
iron ore with the particle size of 0-300mm, and feeding into a closed-loop dry-method pulverizing
system consisting of a high-pressure
roller mill and a
wind power concentrator to prepare ore
powder with a qualified particle size; after being subjected to two-stage preheating, the mineral
powder sequentially enters a
roasting furnace and a reduction furnace in a suspended state to be magnetized and roasted, and high-temperature roasted sand is cooled through a
waste heat boiler to recover heat; and the cooled calcine is subjected to
slurry making, pre-concentration and tailing discarding, then a vertical stirring mill is adopted for wet closed-circuit ore
grinding, then continuous
magnetic separation and
reverse flotation impurity removal are conducted, and finally high-quality
iron ore concentrate is obtained. According to the method, the high-pressure roller milling dry-method
powder preparation and the suspension
roasting process are combined, so that the intermediate links of filtering,
drying and the like in the traditional wet-type powder preparation are omitted, and the problem of
high energy consumption of feeding wet ore into a furnace is solved; and meanwhile, full-process ball-free milling operation is realized by adopting a high-pressure
roller mill and a vertical stirring mill, so that the crushing and
grinding efficiency and the energy efficiency level are greatly improved. Compared with the prior art, the method has the remarkable advantages of being short in process, high in efficiency, energy-saving, environment-friendly and the like, and is particularly suitable for
resource utilization of low-grade
refractory iron ore.