By analyzing the magnetic iron ore, the main characteristics of the mineral hematite pyrite cinder, the following two points is difficult to improve the beneficiation indicators reasons:

(1) The continuous occurrence of magnetite, hematite and gangue minerals in the slag seriously affects the concentrate grade

Magnetite and hematite monomers are visible, mostly in the form of continuous organisms. Common hematite is attached to magnetite or maghemite in a thin layer, or magnetite and hematite are connected in parallel. Another type is that the iron minerals in the pyrite cinder are wrapped in gangue-like gangue minerals. The iron minerals are fine particles adhering to the gangue, the iron minerals are impregnated, and the honeycomb is filled with fine gangue. This complex continuous structure in pyrite cinder is difficult to separate iron minerals from gangue minerals during ore dressing. In the magnetic separation method, magnetic agglomeration is easily formed due to disseminated and honeycomb magnetite, and fine-grained magnetite and magnetite are attached to the surface of the gangue mineral, and the gangue-like gangue mineral is A large number of gangue minerals enter the magnetic product, which affects the magnetic separation concentrate grade.

(2) The low purity of iron minerals is an important reason for the influence of concentrate grade.

The results of electron probe detection of magnetite and hematite in pyrite cinder showed that magnetite and hematite contained trace elements such as Si, S, Pb and Zn, which seriously affected iron in pyrite cinder. Mineral purity, mineral processing grade is difficult to improve.

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