1, single magnetic iron ore, mainly magnetite metamorphic deposition. Most of the iron minerals in the ore are magnetite, mainly composed of fine-grained inlays; the gangue minerals are mainly silicate minerals such as quartz or amphibole. Some have more iron silicates. The ore dressing production history is the longest. Due to the simple ore composition, weak magnetic separation is often used.

For large and medium-sized magnetic separation plants, when the grinding particle size is larger than 0.2 mm, a section of grinding magnetic is used first; when less than 0.2 mm, two-stage grinding magnetic separation is used. If coarse tailing can separate qualified tailings, phase grinding magnetic separation is used. In the water-deficient areas, dry-type grinding dry magnetic separation is used, and the magnetite-rich ore or lean magnetite is depleted. The gangue is generally removed by dry magnetic separation. The former obtains massive ore-rich ore; Choose to obtain concentrate. In order to obtain high-grade concentrates, magnetite concentrates can be treated by reverse flotation or shock sieves. In order to improve the recovery rate, it can be further recycled by considering processes such as tailings re-election.

At present, there is no reasonable utilization route for iron silicate. Therefore, iron silicate in ore does not emphasize recycling in ore dressing. Although iron ore can be recovered by the beneficiation method, since the iron grade in the iron-containing silicate mineral is low, the total concentrate grade will be greatly reduced, which is economically unreasonable. Generally speaking, when the charge contains a certain amount of iron silicate, it does not affect the large and medium-sized blast furnace, and the iron in the iron silicate is not lost from the slag; but in the small blast furnace, due to the iron silicate during the smelting process. It is an endothermic reaction with a low melting point. If a certain amount of iron silicate is contained in the charge, the furnace temperature is lowered to make the furnace condition not smooth, and the slag is run.

2, a multi-metal containing magnetite ore, mainly skarn sulfide-containing magnetite ore and a few magmatic apatite-containing magnetite ore, the ore particles in the form of a magnet (2-0.2 mm) to fine disseminated, pulse there silicate stone or carbonate minerals, frequently with calendar Polygonum iron, cobalt, brass or mineral pyrite and apatite. Such ores also have more ore dressing production practices. Generally, a weak magnetic separation and flotation combined process is adopted, that is, iron is recovered by weak magnetic separation, and sulfide or apatite is recovered by flotation. The principle process is divided into weak magnetic separation-flotation and flotation-weak magnetic separation. The two processes have different orientations of magnetite and sulfide. In the previous process, the continuous body mainly enters the iron concentrate; The latter process mainly enters the sulphide concentrate. Therefore, under the same grinding particle size, the post-floating magnetic process can obtain a sulfide concentrate with a lower sulphide content and a sulphide concentrate with a higher recovery rate.

Depleted ore can also be removed by dry magnetic separation, and then finely screened. Such ores are often self-fluxing and care should be taken to maintain the self-fluxing properties of the concentrate. There are high-containing, magnesium and some were isomorphic occur in the magnetite, iron difficult to separate by mechanical processing methods.

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