According to the material, magnetic materials can be divided into metal magnetic materials and non-metallic magnetic materials. The former is mainly concentrated in the field of military industry and high-end electronic products because of its high price and narrow application range. For example, the price of metal magnets such as Nd-Fe-B and samarium cobalt has changed dramatically in recent years due to the shortage of resources and the expectation of future application increase, which has seriously affected the development of application fields and the promotion of new markets. Non metallic magnetic materials are widely used in various fields because of their low price, stable performance and suitable for harsh and severe environment. Ferrite permanent magnetic materials are the most important kind of non-metallic permanent magnetic materials. The raw materials used for permanent ferrite are iron scale and iron red, which are by-products of the steel plant, and are fired in a high-temperature rotary kiln. It has the advantages of simple and mature process, low price, low price per unit magnetic energy product, corrosion resistance and suitable for harsh working environment. It is widely used in electronics, electrical, machinery, transportation, medical treatment, daily necessities and other fields.

Magnetic materials are a kind of important basic functional materials with a wide range of applications, such as electronics, information, electric tools, automobiles, household appliances and other industries have irreplaceable demand for magnetic materials. At the same time, because the country advocates energy conservation, environmental protection and green development, as a clean energy, magnetic materials are more and more widely used in emerging fields such as energy conservation and environmental protection, new energy, electric vehicles, smart cities and smart earth, and even begin to be used in military and national defense fields such as robot man, UAV, aerospace, satellite remote sensing and so on. In particular, the overall market demand for ferrite permanent magnet materials with low price and rich resources is growing at a high speed of 10% ~ 15% per year. In addition, as one of the key industries in the current national development, the development of magnetic materials has been strongly supported by the national industrial policy.