Magnetic separation is a beneficiation method that uses the difference in magnetic properties of various minerals to sort in the magnetic field of a magnetic separator. As shown in the figure below, when the ore particles with different magnetic properties pass through the magnetic field of the magnetic separator, they are inevitably subjected to magnetic and mechanical forces. Since the magnetic particles with strong magnetic properties and the magnetic particles with weak magnetic properties are different in magnetic force, different trajectories are generated, so that the ore particles are divided into two or more separate beneficiation products according to their magnetic properties.

Magnetic separation can separate magnetic and non-magnetic mixture materials, and can also sort different magnetic materials. In practice, dressing, magnetic separation is mainly used for ores ferrous metals (such as iron ore, manganese ore) sorting. Separation of certain colored, rare metals and certain non-metallic ores, such as clay, quartz sand and graphite , is also applied. It can also be used to exclude magnetic impurities as a means of purifying raw materials.
In recent years, due to the development of high field strength and high gradient magnetic separators, the application fields of magnetic separation methods are still expanding, such as recycling magnetic materials in waste water, removing paramagnetic impurities in chemicals and drugs.

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