The invention discloses a
beneficiation method for a pure magnetic
iron ore. A crude ore is sequentially treated according to the steps such as first crushing, first-stage dry-type magnetic dressing, medium crushing, second-stage dry-type magnetic dressing, fine crushing and third-stage dry-type magnetic dressing, fine ore is obtained after a great amount of gangues are thrown by the third-stage dry-type magnetic dressing and sent to a
grinding head
sieve to be griddled and separated, granules griddled by the
grinding head
sieve are treated in a first-section magnetic dressing process, rough ore griddled by the
grinding head
sieve is treated in a first-section ball grinding and then enters the first-section magnetic dressing process; ore aggregates obtained from the first-section magnetic dressing process are treated in a second-section ball grinding after discharging
gangue sands till the
granularity of ore
powder is -200meshes being more than or equal to 60 percent, ore
powder generated from the second-section ball grinder are treated in second-section magnetic dressing, ore aggregates generated from the second-section magnetic dressing are treated in a high-frequency sieve after discharging
gangue sands, products positioned on the high-frequency sieve are filtered to obtain
ore concentrate, and products positioned below the high-frequency sieve are treated with desliming and then treated with floatation. The invention adopts two sections of grinding ore open-way processes and distinguishes the ore aggregates during the ore dressing process, thereby greatly reducing the
energy consumption of a
system, lowering the production cost and enhancing the utility ratio of equipment.