What are the types of permanent magnet wet magnetic separator?

Permanent magnet wet magnetic separator is an important equipment widely used in the fields of mining, metallurgy and resource recovery. It is mainly used to select magnetic minerals, especially to deal with magnetic particles in wet pulp. Its working principle is based on the strong magnetic field generated by permanent magnetic materials, and the magnetic ore particles are separated from the non-magnetic or weakly magnetic ore particles by the action of the magnetic field. There are many kinds of permanent magnet wet magnetic separators, each with its own characteristics and applicable scenarios. This article will detail several common types of permanent magnet wet magnetic separators.

## 1. are classified according to the structure of slot body ### 1. The downstream permanent magnet wet magnetic separator The downstream permanent magnet wet magnetic separator is the model whose slurry moving direction is consistent with the cylinder rotating direction or the product moving direction. The ore slurry directly enters the lower part of the magnetic system of the cylinder from the ore feed box, and the non-magnetic ore particles and the ore particles with very weak magnetism are discharged through the gap below the cylinder, while the magnetic ore particles are adsorbed on the surface of the cylinder, and as the cylinder rotates to the weak magnetic field, they are discharged into the concentrate tank by the ore discharge pipe. This type of machine has simple structure and large processing capacity, and is suitable for rough selection and selection of coarse-grained strong magnetic ore with a particle size of 6~0mm.

### 2. countercurrent type permanent magnet wet magnetic separator The feeding direction of the slurry of countercurrent type permanent magnet wet magnetic separator is opposite to the rotating direction of the cylinder. The slurry enters directly under the cylinder, and the non-magnetic ore particles are discharged from the tailings hole on the bottom plate, while the magnetic ore particles are adsorbed to the reverse feeding direction of the cylinder and brought to the discharge end, and finally discharged into the concentrate tank. Countercurrent magnetic separators perform particularly well in the treatment of fine-grained minerals, effectively improving concentrate quality and recovery.

### 3. Semi-countercurrent type permanent magnet wet magnetic separator The semi-countercurrent type permanent magnet wet magnetic separator combines the advantages of downstream and countercurrent type. Its ore feed slurry enters the sorting space from below the tank body in a loose suspension state. The movement direction of the ore slurry is basically the same as the direction of the magnetic field force, so that the ore particles can reach the surface of the cylinder with higher magnetic field force. The tailings are discharged from the tailings holes in the floor, maintaining the level of the slurry in the trough. This design makes the semi-countercurrent magnetic separator can obtain higher concentrate quality and recovery rate when dealing with fine and strong magnetic ores, and is widely used in roughing and selection operations.

##2. according to the number of magnetic system classification### 1. single tube permanent magnet wet magnetic separator single tube permanent magnet wet magnetic separator is the most basic form, its structure is simple, easy maintenance. It is suitable for occasions where the requirements for mineral processing are not high, or as the first stage selection equipment in the multi-stage selection process.

### 2. Double-tube permanent magnet wet magnetic separator Double-tube permanent magnet wet magnetic separator has higher processing capacity and sorting accuracy. The upper and lower stages are magnetic cylinders, which can be selected according to actual needs, such as full downstream type, upper cylinder downstream semi-countercurrent type or full semi-countercurrent type. The double cylinder design allows the pulp to be subjected to the magnetic field multiple times when passing through the two magnetic cylinders, thereby improving the concentrate grade and recovery rate.

### 3. Multi-cylinder combined permanent magnet wet magnetic separator Multi-cylinder combined permanent magnet wet magnetic separator is further developed on the basis of double-cylinder magnetic separator, with more magnetic cylinders and more complex sorting process. This type of machine is suitable for the high requirements of concentrate grade and recovery rate, through multi-stage separation and selection, can significantly improve the efficiency of mineral processing.

##3. classified by magnetic field strength Permanent magnet wet magnetic separators can also be classified by magnetic field strength, mainly including weak magnetic field, medium magnetic field, strong magnetic field and high gradient magnetic field. Strong magnetic field permanent magnet wet magnetic separator is suitable for selecting weak magnetic minerals, while high gradient magnetic field permanent magnet wet magnetic separator is more suitable for processing fine