Magnetite is mostly granular aggregates with strong magnetism and wide distribution. According to the different types of iron-bearing minerals, magnetite can be divided into single magnetite ore and mixed magnetite ore, the magnetite iron ore beneficiation process is also different.
In general, single magnetite ore adopts a low-intensity magnetic separation method, and mixed magnetite ore adopts the combined process of multiple beneficiation methods, including magnetic separation, flotation separation, gravity separation, and so on.
Ore characteristics: Simple composition, strong magnetism, and easy to grind.
Application of solution: Single magnetic separation.
◆ The particle size of grinding ore>0.2mm---the one-stage grinding-magnetic separation;
◆ The particle size of grinding ore<0.2mm---the two-stage grinding-magnetic separation;
◆ For drought and scarce water areas, the dry grinding-dry magnetic separation process can be considered;
◆ For the depleted rich magnetite iron ores or poor magnetite ores, the gangue can generally be removed by the dry magnetic separation process, then the concentrate ore can be obtained by grinding and magnetic separation process.
Ore characteristics: Magnetite containing polymetallic (silicate or carbonate minerals, associated with cobalt pyrite, chalcopyrite, and apatite, etc.)
Application of solution: Low-intensity magnetic separation-flotation.
In general, the low intensity magnetic separation-flotation processes can be divided into low intensity magnetic separation-flotation process and flotation-low intensity magnetic separation process, with different directions of the continuum of magnetite and sulfide.
For the low intensity magnetic separation-flotation process, the continuous body mainly enters the iron concentrate; For the flotation-low intensity magnetic separation process, the continuous body mainly enters the sulfide concentrate.
Therefore, the iron concentrate with low sulfide content and the sulfide concentrate with a high recovery rate can be obtained by the flotation-magnetic process.
Ore characteristics: Magnetite and hematite or siderite, mostly in fine-grained inlays; gangue minerals are mainly quartz, and some contain more iron silicate.
Application of solution: Low-intensity magnetic separation-gravity/flotation.
For the low-intensity magnetic separation-flotation process, the flotation can be placed after the low-intensity magnetic separation according to the nature of the ore and the actual conditions of the beneficiation plant, so as to ensure stable production and save costs.
Ore characteristics: Magnetite-hematite/siderite, mostly in fine-grained inlays; gangue is mainly silicate, carbonate minerals, or firefly, with accompanying components including apatite, pyrite, chalcopyrite, and rare earth minerals.
Application of solution: The combined process of low-intensity magnetic separation and other separation methods.
Firstly, the magnetite is recovered by the low-intensity magnetic separation. Secondly, the weak magnetic iron minerals are recovered by the gravity separation or strong magnetic separation. Lastly, the accompanying components are recovered by the flotation.
Several magnetite iron ore beneficiation processes have been introduced above. In actual production, to analyze specific problems in detail, we recommend that you first conduct a beneficiation test and choose a suitable separation process according to the properties of magnetite.
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