high gradient magnetic separation
PTMS MAGNETIC SEPARATOR
what is magnetic separation in science?
The magnet material can be divided into "permanent magnets" and "non-permanent magnets". The permanent magnet can be a natural product, also known as a natural magnet, or it can be made by hand (the strongest permanent magnet is a neodymium magnet). Non-permanent magnets, only magnetic under certain conditions, are usually produced in the form of electromagnets, which use current to strengthen their magnetic field. Permanent magnets are divided into two categories:
The first major categories are: metal alloy magnets including neodymium iron boron magnets Nd2Fe14B), samarium cobalt magnets (SmCo), alnico magnets (ALNiCO);
The second major category is: ferrite permanent magnet material (Ferrite).
1. Neodymium iron boron magnet: It is the magnet with the highest commercialization performance. It is called magnetic king. It has extremely high magnetic properties and its maximum magnetic energy product (BHmax) is more than 10 times higher than ferrite. Its mechanical processing performance is also quite good. Operating temperatures up to 200 ° C. Moreover, its texture is hard, its performance is stable, and it has a good cost performance, so its application is extremely extensive. However, because of its strong chemical activity, it must be treated with a surface coating. (such as Zn, Ni, electrophoresis, passivation, etc.).
2. AlNiCo magnet: It is an alloy composed of aluminum, nickel, cobalt, iron and other trace metal elements. The casting process can be processed into different sizes and shapes, and the processability is very good. Cast AlNiCo permanent magnets have the lowest reversible temperature coefficient and can operate at temperatures up to 600 °C. AlNiCo permanent magnet products are widely used in a variety of instrumentation and other applications.
3. SmCo is classified into SmCo5 and Sm2Co17 depending on the composition. Its development is limited due to the high price of its materials. Samarium Cobalt (SmCo), as a rare earth permanent magnet, not only has a high magnetic energy product (14-28 MGOe), reliable coercivity and good temperature characteristics. Compared with neodymium iron boron magnets, samarium cobalt magnets are more suitable for working in high temperature environments.
4. Ferrite magnet: Its main raw materials include BaFe12O19 and SrFe12O19. It is made of ceramic technology and has a relatively hard texture. It is a brittle material. Because ferrite magnets have good temperature resistance, low price and moderate performance, they have become the most widely used permanent magnets.
