In addition to iron (also known as magnetic separation, that is, magnetic separation) is based on the different components of the magnetic separation of materials, using different types of iron removal machine will be material in the separation of different magnetic components. The magnetic force of a magnet is called a magnetic field. The physical quantity which indicates the magnetic field strength is called the magnetic field strength, the commonly used symbol H indicates that the unit is A/m. Mineral magnetic difference is the basis of magnetic separation. Mineral magnetism can be measured, according to its degree of magnetic strength can be divided into three categories of minerals: strong magnetic minerals, weak magnetic minerals, non magnetic minerals. In the magnetic field of the iron removing machine, the strong magnetic minerals are the largest magnetic minerals, weak magnetic minerals are less magnetic minerals, magnetic minerals are not affected by magnetic or weak magnetic force. In magnetic separation process, the ore particle by a variety of forces, in addition to magnetic force, there are gravity, centrifugal force, water flow and friction force and so on. When the magnetic particles are larger than the rest of the magnetic force and time, will be sucked out or away from from the material stream, become magnetic products, the remaining are non magnetic products, realize the separation of different magnetic minerals.