The effect of magnetic separation is not good? Maybe there is something wrong with these places!
For quartz, kaolin, bentonite, wollastonite, feldspar, talc, attapulgite and other non-metallic mineral purification, magnetic separation is to remove iron impurities, magnetic minerals widely used and effective means, and magnetic separation effect directly affects the quality of products. Practice shows that the main factors affecting the effect of magnetic separation are as follows:
1. Magnetic differences of minerals
Magnetic separation is based on the magnetic separation of minerals, the greater the magnetic susceptibility of minerals (magnetic), the more favorable magnetic separation; at the same time, minerals also need to have obvious magnetic differences, otherwise it can not be separated and purified by magnetic separation.
2. Composition of fineness and grain size of selected minerals
Magnetic separation is mainly suitable for coarse and medium-grained mineral separation and purification. It is as coarse as possible under the condition that the mineral itself can achieve monomer dissociation, generally greater than 0.074mm, and the particle size should be as uniform as possible. At present, the lower limit of effective magnetic separation fineness is 0.035mm. When it is too fine, strong magnetic minerals are easily taken away by water flow, while weak magnetic minerals are not easily captured effectively. Using high magnetic field strength and high gradient, the lower limit can reach 10-15μm, but the effect of magnetic separation of weak magnetic minerals is limited.
3. The phenomenon of mineral mud
Some minerals such as hematite, limonite itself easy to mud, often form a mud cover, coupled with its own weak magnetism, will greatly affect the effect of magnetic separation. Take appropriate cleaning or control of grinding fineness and other measures.
4. Magnetic separation process
Generally, the mechanical ferromagnetism mixed in the crushing process is strong, and the weak magnetic separation equipment should be used to remove the weak magnetic impurities, and then the strong magnetic separation equipment should be used to remove the weak magnetic impurities. When the content of strong magnetic substances is large, the strong magnetic separation equipment is directly used to remove iron.
5. Magnetic separation equipment
The performance of magnetic separation equipment is an important factor affecting the effect of magnetic separation, mainly including magnetic field strength, magnetic field gradient, structural characteristics, etc., which should be selected according to different mineral characteristics.
Electromagnetic and permanent magnet equipment is simple and effective, low cost, widely used, but the magnetic field is weak, for the treatment of minerals with weak magnetic effect is very poor.
The high gradient magnetic separator has a strong magnetic field, which can separate many iron-containing mineral impurities from the mud. It has expanded from the fields of regular magnetic separation and kaolin purification to environmental protection, biochemistry and other fields.
Superconducting magnetic separator is the use of superconducting magnets for mineral selection equipment, in non-metallic mineral processing, regular magnetic separator of high magnetic susceptibility of paramagnetic minerals or ferromagnetic minerals can be better removed, the lower limit of particle size can be as low as 20μm, but the cost is higher.
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