Multi-stage suspension magnetizing roasting-magnetic separation system device and method for refractory iron ore

A multi-stage suspension magnetizing roasting-magnetic separation system for processing a refractory iron ore, comprising:

• a feed bin, a suspension preheater, a gas burner, a first-stage suspension oxidizer, a first-stage suspension reductor, a first-stage electromagnetic dry magnetic separator, a first-stage X-ray fluorescence online grade analyzer, a first-stage splitter, a second-stage suspension oxidizer, a second-stage suspension reductor, a first-stage tailings collector, a first-stage concentrate collector, a second-stage tailings collector, a second-stage concentrate collector, a second-stage middling ore collector, a cyclone separator, a dust remover, a dust collector, a roots blower, a second-stage electromagnetic dry magnetic separator, a second-stage X-ray fluorescence online grade analyzer, and a second-stage splitter, wherein a feed inlet of the suspension preheater is connected to a discharge outlet of the feed bin, and a discharge outlet of the suspension preheater is connected to a feed inlet of the first-stage suspension oxidizer,
• wherein a top discharge outlet of the first-stage suspension oxidizer is connected to a feed inlet of the cyclone separator, a bottom discharge outlet of the first-stage suspension oxidizer is connected to an inlet of the first-stage suspension reductor, a bottom discharge outlet of the first-stage reductor is connected to a feed inlet of the first-stage electromagnetic dry magnetic separator, and the first-stage X-ray fluorescence online grade analyzer is disposed between an outlet of the first-stage electromagnetic dry magnetic separator, and an inlet of the first-stage splitter,
• wherein the first-stage splitter has a high-grade discharge outlet connected to the first-stage concentrate collector and a low-grade discharge outlet connected to an inlet of the second-stage suspension oxidizer, and a tailings outlet of the first-stage electromagnetic dry magnetic separator is connected to the first-stage tailings collector,
• wherein an outlet of the second-stage suspension oxidizer is connected to a feed inlet of the second stage-suspension reductor, and a bottom discharge outlet of the second-stage suspension reductor is connected to a feed inlet of the second-stage electromagnetic dry magnetic separator,
• wherein the second-stage X-ray fluorescence online grade analyzer is disposed between a concentrate outlet of the second-stage electromagnetic dry magnetic separator and an inlet of the second-stage splitter,
• wherein the second stage splitter has a high-grade concentrate outlet connected to the second-stage concentrate collector and a low-grade concentrate outlet connected to the second-stage middling ore collector, and a tailings outlet of the second-stage electromagnetic dry magnetic separator is connected to the second-stage tailings collector, and
• wherein a dust gas outlet at a top of the cyclone separator is connected to a dust gas inlet of the dust remover, an air outlet at a top of the dust remover is connected to the roots blower, and a dust outlet of the dust remover is connected to the dust collector.