Hematite is an iron ore, chemical composition of Fe2O3, belonging to the iron oxide minerals, in recent years, as China's Yi election magnetite increasingly scarce, accounting for more than 18% of the total iron ore resources of hematite gradually iron ore into the mainstream market, and beneficiation process and equipment is also associated with hematite surge in demand.

Our hematite mainly distributed in Liaoning, Hebei, Inner Mongolia, Henan, Shanxi, Guizhou, Anhui and other places, although large reserves, but only about 30% of the grade, complex components, less coarse cloth inlay, fine disseminated more . Because it is weakly magnetic minerals, so simply by magnetic separation process (including roasting, high intensity magnetic separation) does not work, they often meet other hematite beneficiation process - flotation, re-election, these beneficiation technology in red on iron ore are generally used in combination, a single process is rarely used, for example: roasting process + magnetic separation process, magnetic separation process + flotation process, magnetic field weakening + + re-election and so on.

Common hematite beneficiation Process description:

First, the crushing and screening stage

Because of widespread low grade hematite, complex composition, so crushing and screening with open or closed three sections of three sections of a majority, the main flow of ore through crushing - the crushing - screening - crushing, crushing and screening stage about red iron ore processing equipment as follows:

Second, the grinding stage

Hematite usually from grinding mill (a large processing plant) or lattice-type ball mill + overflow ball mill for wet grinding, ball mill before the old drive to the center of a ball mill, high energy consumption, in recent years the development of domestic enterprises energy surrounding wheeled roller mill for many hematite old dressing plant transformation, and achieved significant energy savings.

Third, the beneficiation stage

Hematite beneficiation process is often used: weakening + re-election, magnetic separation + flotation.

Weakening + re-election

Process advantages: simple process equipment, both the use of mineral properties, and reducing the amount of ore re-election of the loop, you can take advantage of different devices sorting different grain size characteristics, give full play an effective election re-election equipment spiral chute and centrifugal concentrator do not, live better sorting index.

Weak before the regular use of permanent magnet magnetic dehydration trough, now the old processing plant have been substantially transformed into Drum Separator, the advantage compared to the permanent dewatering tank, the crude concentrate grade can be increased 3-4%, tail minerals rate increased 5-6%, can reduce water consumption.

Weak magnetite by magnetic separation stage sorting out, then use the re-election of hematite and gangue separated from the stage before the general flow of the original thickener - centrifugal concentrator, the majority has been transformed into spiral classifier + + spiral chute centrifugal concentrator, spiral chute sorting where grit, centrifugal concentrator sorting out the overflow from hydrocyclone pulp, achieve the purpose of classification re-election.

Magnetic Flotation +

Process Advantage: after the first or the first magnetic magnetic float after float, complex components can be guaranteed in hematite iron ore beneficiation low sulfur content, while increasing other valuable metals recovery.