[1] is a screening equipment used to remove iron powder from the recycled powder particles. After the slurry flows into the tank through the ore feeding box, the ore particles enter the feed area of the tank in a loose state under the action of the water flow of the ore feeding spout. Under the action of magnetic field, magnetic ore particles gather magnetically to form a "magnetic cluster" or "magnetic chain". The "magnetic cluster" or "magnetic chain" is affected by magnetic force in the pulp, moves towards the magnetic pole, and is adsorbed on the cylinder. Since the polarity of the magnetic poles is alternately arranged along the rotation direction of the cylinder and is fixed during operation, when the "magnetic cluster" or "magnetic chain" rotates with the cylinder, the magnetic stirring phenomenon occurs due to the alternating magnetic poles, and the non-magnetic minerals such as gangue mixed in the "magnetic cluster" or "magnetic chain" fall off during turning, and the "magnetic cluster" or "magnetic lotus" finally absorbed on the surface of the cylinder is the concentrate. Magnetic separators are widely used in resource recovery, wood industry, mining industry, kiln industry, chemistry, food and other workshops. They are suitable for wet magnetic separation of magnetite, pyrrhotite, roasted ore, ilmenite and other materials with a particle size of less than 3mm. They are also used for iron removal of coal, non-metallic ore, building materials and other materials. They are one of the most widely used and versatile machines in the industry.