Purpose is to recover magnetic separator or magnetic exclude large range (from ferromagnetism to diamagnetism), those particles very wide grain size (from a few millimeters to micrometers), when the dressing is separated into two or more magnetic A group of ore particles with different particle sizes. In order to recover these particles, the magnetic induction of the magnetic separator varies greatly, so different methods must be used to generate the desired magnetic field. The magnetic force of the magnetic particles during sorting depends on the physical properties of the mineral, the magnetic field induced intensity and the magnetic field gradient. Therefore, in order to effectively separate valuable minerals from unwanted minerals, magnetic induction and magnetic field gradients should be selected in order to obtain high recovery and high quality concentrates. In general, the separation of ferromagnetic minerals, magnetic induction is low, the magnetic field gradient must be determined by the mineral size. For coarse-grained minerals, the magnetic field is required to have a large depth and the magnetic field gradient is small; for fine-grained minerals, the depth of the magnetic field is required to be small, and the magnetic field gradient can be increased. When sorting weak magnetic minerals, the magnetic induction intensity is required to be high. For the coarse-grained minerals, the magnetic field gradient is low, for the fine-grained materials, the magnetic field gradient is high, and for the fine-grain minerals, the magnetic field gradient is the highest, that is, the so-called high gradient magnetic field. In the magnetic filtration process of processing fine-grain weak magnetic minerals, strong magnetic force is required to ensure maximum exclusion of non-magnetic mineral solids from the suspension, high magnetic induction or magnetic field gradient must be used, or both can be high. Achieve effective separation. The purpose of kaolin dressing is to exclude iron-containing components to increase product whiteness, and useful products are non-magnetic parts. With high magnetic force and long sorting time, high quality non-magnetic products are available. An electromagnetic mechanism composed of a permanent magnet material or a current-carrying electromagnetic material capable of generating a desired magnetic induction (magnetic flux density) and enabling the magnetic flux to be closed along a certain path is called a magnet, or simply a magnet. According to different materials constituting the magnet, it can be divided into permanent magnets and electromagnets. The latter can be divided into constant conductive magnets and superconducting magnets. According to the current characteristics, it can be divided into constant magnetic field magnets, alternating currents and stable use. Alternating current is generated. Different magnets for different occasions. Permanent magnets are used in weak magnetic field magnetic separation equipment . Constant magnetic field electromagnets are mostly used in strong magnetic field magnetic separation equipment. Alternating magnetic fields and pulsating magnetic field electromagnets are mainly used for sorting weak magnetic fields and ferromagnetic iron powders. Superconducting magnets are used in magnetic separation equipment that requires the generation of ultra-strong magnetic fields, which are used in general weak magnetic fields and strong magnetic field magnetic separation equipment. Permanent magnets The early history of magnetic separation is closely related to permanent magnets, which are used to remove ferromagnetic minerals from waste or to recover ferromagnetic minerals from ore. With the advent of high power electromagnets, permanent magnets for magnetic separation of importance has declined, but in recent years the permanent magnet and cause for great concern, which is due to new developments in the rare earth metal permanent magnet materials due. The permanent magnet material has undergone a stage of development of a magnetic alloy, a ferrite, a magnetic alloy. Early magnetic cobalt-nickel alloy is aluminum series, today is a rare earth - cobalt alloy and Nd-Fe-B alloy, an aluminum-cobalt-nickel alloy magnetic characteristics of the residual magnetic flux density is large, but the coercive force is small. The ferrite has a large coercive force, but the residual magnetic induction is small. The residual magnetic induction strength and coercive force of the rare earth-cobalt alloy and the neodymium iron boron alloy are both large. The magnetic induction generated by the permanent magnet rarely exceeds 1T, and the electromagnet is easily generated by the electromagnet. Compared with electromagnets, permanent magnets have two distinct advantages: permanent magnets do not require any energy or any cooling liquid; magnetic induction is always stable, pulsating in the range of 10-8, and the rate of decline of magnetic induction is 10-3 per year. Magnitude. Permanent magnets also have two disadvantages: the magnitude of the magnetic induction varies with temperature and decreases at a rate of 10-4 per degree Celsius. The magnetic material used in the permanent magnet is a hard magnetic material, which has high remanence and large coercive force, which also determines the large magnetic energy product per unit volume. The development process of permanent magnet alloys has been developed in the past 100 years as Co steel, Co steel, Al-Ni-Co steel, rare earth-cobalt steel and Nd-Fe-B alloy, and their maximum magnetic energy product increases in turn. Industrial primary materials in addition to permanent magnet alloys, there is also an important material - ferrite, is the most important industrial permanent magnets, because of its low price and high coercivity. The second important permanent magnet is Al-Ni-Co, which contains 20-40% cobalt and iron, nickel, aluminum and other components, so it is more expensive than ferrite. It has the required high remanence value, good thermal stability, but low coercivity, so the magnetic energy product is between 10~80kjm-3. The magnetic properties are better SmCo5-based magnets, which have high remanence and coercive force, so the magnetic energy product is large. The coercive force of the alloy is produced by the anisotropy of the crystal system of the ferromagnetic crystal. The magnet is sintered from a fine powder of magnetic force. The magnetic performance is significantly higher than the above two, but the price is more expensive. The reason why NdFeB alloy attracts people's attention: First, the skutter cobalt alloy has higher magnetic energy product, but the price is more expensive, while the NdFeB alloy magnetic energy product is 50% higher than samarium cobalt; the third is the ratio of strontium reserves to rare earth elements. It is big, so the price is cheaper. From the viewpoint of heat sensitivity, the temperature coefficient of NdFeB alloy is three times that of SmCo alloy, and the coercive force of the material decreases with the increase of temperature. NdFeB alloy is tough and not brittle. In addition, it has a strong reaction ability with the normal environment. Therefore, it must be protected by a painting or spraying system. The tendency of this corrosion may be due to the presence of a ruthenium-rich phase (very easily oxidized) around the particles. The addition of cobalt and aluminum to the iron-boron system improves magnetic and temperature characteristics. Ferrite requires magnetic induction machine magnetic induction is not high, such as weak magnetic field magnetic separator, ferrite can be used as permanent magnet magnetic material. Ferrite is a composite oxide of iron and other divalent metal elements. Conductivity belongs to semiconductors, magnetic permeability is ferrimagnetic, and looks similar to ceramics, also known as magnetic porcelain, and is used as a magnetic medium in applications. In terms of internal magnetic properties, the biggest difference between ferrite and permanent magnet alloy is that the saturation magnetization is low, so the magnetic energy stored per unit volume is low, which is difficult to apply in a strong magnetic field magnetic separator that requires high magnetic energy density. The reason for this is that the ferrite magnetism is derived from the difference between the two sub-lattice magnetic moments of the ferrimagnetic which are cancelled. The advantages of ferrite are as follows: high coercive force, so strong anti-demagnetization effect; low raw material price, simple manufacturing process, low cost; low density (4~5.2T/m3), light weight; demagnetization curve or The main part is close to a straight line, and the return line basically coincides with the demagnetization curve (or its straight line), so the working point of the magnet is stable during operation. The main disadvantages are: remanence is not high (0.2~0.42T); ambient temperature has a great influence on magnetic properties, and the remanence temperature coefficient is 0.18% per °C. Electromagnet A strong magnetic field magnetic separator that selects weak magnetic minerals needs to produce high magnetic induction and magnetic field gradients. Permanent magnets cannot be realized. Electromagnets should be used. Because leaving the surface of the permanent magnet, the magnetic field drops quickly, and the required magnetic force cannot be guaranteed in a certain gap, and the electromagnetic type magnetic separator can generate a sufficiently strong magnetic field in a large working air gap and has a high processing amount. . A common electromagnet is used as the coil core type. The steel magnetizer is limited by magnetic saturation, and the obtained magnetic induction strength cannot exceed the limit. However, in the industrial production, a strong magnetic separator for recovering fine-grained weak magnetic minerals is used, and it is still quite effective to use an electromagnet to generate a magnetic force. In the actual electromagnetic magnetic separator, commonly used magnets are solenoid magnets, alternating magnetic field magnets, pulsating magnetic field magnets, pulsed magnetic field magnets and superconducting magnets, which have different characteristics and can be adapted to beneficiation of different magnetic separators. Claim. Car Covers,Car Body Cover,Car Cover Outdoor Waterproof,Proof Dust Cover,Car Cover Outdoor,Car Cover Waterproof,Car Protection Cover Shaoxing Haoto Trading Co.,Ltd , https://www.haototents.com