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Magnetic separation is a common mineral processing method, which realize the separation in the uneven magnetic field of magnetic separators according to the magnetic differences among various minerals. Therefore, it is very important to select the suitable magnetic separator to achieve the ideal magnetic separation effect.
In recent years, magnetic separation equipment has been developed rapidly, and became larger in equipment scale and diversified in structure form. The structure of the magnetic separator is diverse, according to different classification methods, the magnetic separator can be divided into different categories.
According to the different bearing medium, the magnetic separator is divided into dry magnetic separator and wet magnetic separator.
Dry magnetic separator completes the magnetic separation in the air,while the wet type magnetic separator finish the magnetic separation work in the water or magnetic liquid.
According to the magnetic intensity of magnetic separator, the magnetic separator is divided into weak magnetic separator and strong magnetic separator.
According to the method of generating magnetic field, the magnetic separator can be divided into permanent magnetic separator, electromagnetic separator and superconducting type magnetic separator.
Magnetic separation is widely used for the separation of ferrous metals non-ferrous metals and rare metals. Due to the different characteristics of ores, the applicable type of magnetic separators is also different.
The low intensity magnetic separator is mainly used for the separation of magnetite, pyrrhotite, ilmenite and other highly magnetic minerals, which can be divided into dry magnetic separator and wet magnetic separator.
Dry low intensity magnetic separator is mainly used for the enrichment of fine grade strong magnetic ore and the remove the iron scrap and strong magnetic impurities from the material, and it is often used for the pre-separation of strong magnetic minerals.
Wet low intensity magnetic separator is divided into electromagnetic magnetic separator and permanent magnetic separator. In the early stage, the electromagnetic wet low intensity magnetic separator was mostly used as the main magnetic separation equipment for iron removal, and then it was gradually replaced by permanent low intensity magnetic separator. It is mainly used for the separation of fine grained minerals,especially the concentration of strong magnetic fine grained minerals.
High intensity magnetic separator adopts the closed magnetic system and a certain shape of induction magnetic pole or magnetic medium, and produce the strong magnetic field force in its separation zone, so as to effectively separate weak magnetic minerals. It is mainly used for the separation of limonite, manganese ore, red mud ore and other weak magnetic minerals and iron removal of non-metallic ore. According to the working form, the high intensity magnetic separator can be divided into dry type and wet type.
Dry high intensity magnetic separator is divided into disc type magnetic separator, roller type magnetic separator and drum type magnetic separator.
The lower limit of feed size of wet type high intensity magnetic separator can be very fine, especially suitable for separation of weak magnetic minerals with higher dissociation requirements.
High gradient magnetic separator is a new type of magnetic separation equipment. The magnetic field force and the processing ability of magnetic separator are improved through the interaction of magnetic medium and particles, which is mainly used to the separation of fine mineral and refractory ore.
For the magnetic structure of high gradient magnetic separator, the steel wool (fibrous) magnetic medium and iron cladding device combines in the spiral tube uniform magnetic field, resulting in a high gradient uneven magnetic field, which can effectively separate the weak magnetic fine particles that are difficult to separate by the general magnetic separator, and greatly reduce the lower limit of the size of separation.
The above is the classification and application of magnetic separators . As for the final selection of the suitable magnetic separators.It is suggested that a factory with the qualification of the concentrator should be commissioned to carry out the concentrator test.because we need to know the mineral properties through the ore dressing test analysis first in line with the actual situation.
1Dry or Wet Magnetic Separator? 7 1960