The magnetic separator uses the magnetic differences between minerals for separation, which plays a role in improving the grade of ore, purifying solid and liquid materials, and recycling waste. Magnetic separators are widely used in mining, wood industry, ceramics, chemical, food, and other industries. For mining, the magnetic separator is suitable for wet or dry magnetic separation of manganese ore, magnetite, pyrrhotite, roasted ore, ilmenite, hematite, and other materials with a particle size of less than 50mm. Magnetic separators are also used for iron removal operations and waste treatment operations for coal, non-metallic minerals, building materials, and other materials. In this article, we will take a look at the magnets used in magnetic separators.
Before going any further, let’s figure out the structure of magnetic separators.
The magnetic separator (take the wet permanent magnetic drum magnetic separator as an example) is mainly composed of 6 parts: cylinder, roller, brush roller, magnetic system, tank, and transmission part. The cylinder is welded from 2-3mm stainless steel plates, and the end cover is cast aluminum or workpiece, connected to the cylinder with stainless steel screws. The motor drives the cylinder, magnetic roller, and brush roller to rotate through a reducer or directly using a step-less speed regulating motor.
For the permanent magnet separator, the permanent magnet is its most important component, and the quality of the permanent magnet determines its performance. Permanent magnets of magnetic separators are generally made into a certain size, so they are customarily called permanent magnet blocks or magnet blocks for short.
The permanent magnet materials that can be used as the magnetic system of the magnetic separator include ferrite, AlNiCo, iron-chromium cobalt, and manganese aluminum iron, samarium cobalt permanent magnet materials, and neodymium iron boron permanent magnet materials.
At present, the mainstream permanent magnet materials used in magnetic separation equipment are mainly ferrite, followed by neodymium iron boron permanent magnet materials.
In the design of the magnetic circuit, it is necessary to choose which permanent magnet material to use according to the specific conditions of various aspects. The influencing factors can be summarized in the following aspects:
1. Magnetic field strength. A constant magnetic field is to be generated in the designated working space. The strength of this magnetic field determines which permanent magnetic material needs to be used. The magnetic properties of neodymium iron boron permanent magnets are much higher than ferrites.
2. The requirements for the stability of the magnetic field, that is, the adaptability of the permanent magnet material to environmental factors such as temperature, humidity, vibration，and shock.
3. Mechanical properties, such as the toughness, flexibility, and compressive strength of the magnet.
Thank you for reading our article and we hope it can help you to have a better understanding of the magnetic separators and magnets used in magnetic separators. If you want to know more about magnets, we would like to advise you to visit Stanford Magnets for more information.
Stanford Magnets is a leading magnet supplier across the world, who has been involved in R&D, manufacturing, and sales of magnets since the 1990s. It provides customers with high-quality permanent magnets such as ferrite magnets, AlNiCo magnets, SmCo magnets, and neodymium magnets at a very competitive price.