At present, there are many types of magnetic separators produced at home and abroad, and their classification methods are also different. According to different methods of generating magnetic field, the magnetic separator is divided into permanent magnetic separator and electromagnetic magnetic separator; according to different methods, the magnetic separator is divided into dry magnetic separator (large magnetic separator) and wet magnetic separation. Machine, according to the strength of the magnetic field, the magnetic separator is divided into weak magnetic field separator (H<2500 Oersted), medium magnetic field separator (H<6000 Oster), strong magnetic field separator (H =6000-26000 Oster).

1. Weak magnetic field wet type permanent magnetic cylinder magnetic separator

According to the different structural forms of the magnetic separator, it is divided into three types: 1. Downstream magnetic separator 2. Reverse flow magnetic separator 3. Semi-reverse magnetic separator

Second, three different types of bottom box structure type and application range

Due to the different structural forms of the tank bottom box, the direction in which the slurry is fed into the magnetic separator is different from the product moving direction, and the length of the sorting area and the tailings belt are different, which determines the sorting characteristics of the three different tanks.

The magnetic separator geometry not only has a certain influence on the selection index and operation, but also has different adaptability to the granularity of the treated ore. The characteristics are described separately below:

The characteristics of the downstream magnetic separator and the field strength of the adaptation range (H=2800 Oersted or above)

The direction of the ore is consistent with the direction of rotation of the cylinder. The slurry is directly fed to the cylinder under the magnetic field of the cylinder, and the non-magnetic ore particles and the magnetically weak one are discharged from the gap between the two bottom plates below the cylinder. The magnetic ore particles are attracted to the surface of the cylinder and rotate with the cylinder, and are discharged to a weak magnetic field at the edge of the magnetic wire.

The downstream magnetic separator is suitable for the treatment of coarse ore, rough selection of ferromagnetic minerals with a particle size of less than 600 mm, and pre-selection (greater than 6 mm) for pre-grinding.

The characteristics of this magnetic separator are large processing capacity, high quality of concentrate, simple mechanical structure, many sorting indexes, large influence on the amount of ore, and sensitive. When the amount of ore is large, the throughput per unit area When the flow rate is increased, the magnetic ore particles are easily lost in the tailings, causing the tailings to rise.

Characteristics of countercurrent magnetic separator and field of application (H=2200 Oersted)

The direction of the ore is opposite to the direction of rotation of the cylinder, and the slurry is fed directly from the feeding tank to the magnetic system of the cylinder. The non-magnetic ore and weak magnetic ore particles are discharged from the bottom hole of the bottom of the magnetic system. Because the discharge end of the magnetic separator is closer to the ore gate and the magnetic system is poor, the concentrate has a low taste, but his tailings are far from the ore, and the slurry passes through a longer sorting area. With the addition of magnetism, the chance of the ore particles being attracted is increased, and the tailings mouth is farther from the discharge end, and the magnetic ore particles may be mixed into the tailings. Therefore, this magnetic separator high metal recoveries, but concentrate called low taste.

This magnetic separator is suitable for rough selection and sweeping of ferromagnetic minerals with a particle size of less than 0.6 mm. Not suitable for coarse ore, the particle size is coarse and easy to deposit, thus blocking the sorting area.

Semi-reverse flow magnetic separator features and scope of application

Its feeding position is the intermediate feeding, and the slurry enters the sorting area from the lower part of the tank. The direction of the magnetic field in the ore-mining direction is basically the same, the pulp is often in a suspended state, and the magnetic ore particles are easily attracted to the surface of the cylinder, and are eliminated by following the cylinder to the weakest point of the magnetic field at the edge of the magnetic system. Non-magnetic ore particles or weak magnetic ore particles flow into the sweeping area against the direction of rotation of the cylinder and are discharged through the tailings holes on the bottom plate. Therefore, it is advantageous to reduce the taste of tailings and improve the metal recovery rate. The semi-reverse bottom tank combines the advantages of the downstream and counter-current bottom tanks, and its concentrate has a relatively high taste. At present, it is an ideal bottom box type, and the working gap between the bottom plate and the cylinder of the semi-reverse bottom box can be adjusted within the range of 25-40 mm. This magnetic separator not only uses the rough selection of 0.5-0 mm ferromagnetic minerals, but is especially suitable for the selection of 0.5-0 mm ferromagnetic minerals.

However, the same semi-reverse flow magnetic separator is used in different places (rough selection, selection), and its field strength is different, depending on the nature of the ore and the field strength used for different position selection methods.

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