Separation Of Minerals With Rare Earth Magnets


  A new type of rare earth magnet based on the concept […]

  A new type of rare earth magnet based on the concept of superconductivity opens up new possibilities in the field of magnetic separation. All minerals are affected by the magnetic field, although in rare cases the effect is small. Paramagnetic minerals and even ferromagnetic minerals are strongly attracted along the lines of magnetic force. With this feature, minerals can be separated by high-strength magnetic or electromagnetic separators.


  The introduction of new magnet technology that introduces one or two rare earth alloys has greatly changed the situation of magnetic separation. It has successfully replaced the conventional electromagnetic high-intensity magnetic separator. One example of this technology is the fast magnetic roller magnetic separator, which has been successfully installed in various mineral processing applications.


  The specially designed design configuration is used to generate a high-strength magnetic field, and the "superconductivity" phenomenon at extremely low temperatures will produce a stronger magnetic field. These high-strength magnetic fields can easily remove impurities and even have weak magnetism. This technology is widely used in the processing of minerals such as glass sand, talc and kaolin.


  The basic principle


  The function of the soil alloy magnetic separator is affected by two variables: magnetic field strength and magnetic field gradient. These factors are mainly responsible for the separation reaction. Magnetic field strength refers to the number of magnetic flux lines passing through a unit area, and magnetic field refers to the rate of change of the magnetic field or the convergence of magnetic flux. A high gradient is induced at the point where the magnetic lines of force converge. Under the influence of the magnetic field, magnetic particles or minerals will migrate to the area with the highest magnetic flux density. The migration of particles will occur at this point or the tip of the ridge, which forms the basic principle of magnetic separation.


  To be precise, the strength of the magnetic field will fix the particles, and the magnetic field gradient will move the particles. The magnetic force acting on the particle is the product of the magnetic field strength and the magnetic field gradient. In order to obtain the maximum magnetic field strength, both the magnetic field strength and the field gradient are amplified to the highest.


  Geomagnetic and drum separator


  The drum separator consists of a hollow cylindrical rotating drum, which is made of stainless steel or similar non-magnetic materials, and has a permanent magnet fixed in a fixed (adjustable) position in the drum. These separators come in different models, depending on the type of material to be processed.


  For granular materials, the slurry can be directly transported to the top of the drum through a feeder, or it can be transported to the top of the drum through a conveyor. In such a configuration, the drum acts as a head pulley. The magnet is located at the core of the photosensitive drum, so non-magnetic materials can follow the natural trajectory part and automatically eject from the photosensitive drum while keeping magnetic impurities on the surface of the photosensitive drum. These impurities are taken away and discharged.

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