Magnesium oxide can be divided into: heavy fired magnesium, light fired magnesium, industrial magnesium oxide (light magnesium oxide), heavy magnesium oxide, active magnesium oxide, high purity magnesia, fused magnesium oxide, magnesium oxide whisker, magnesium peroxide, nano magnesium oxide, magnesium hydroxide. Its chemical formula is MgO, the relative molecular weight is 40.30, melting point is 2800 degrees, odorless, tasteless, non-toxic white amorphous powder, insoluble in water, alcohol, acid or ammonium salt solution, solubility in water increases with the increase of carbon dioxide content in water. Magnesium oxide in storage and transportation process afraid of water, afraid of moisture, water is easy to deteriorate.

Refired magnesium: Mainly used in steel furnace lining as refractory material, also used in the production of calcium magnesia brick, magnesia carbon brick, magnesia aluminum brick and electric heating element insulation filler.

Light fired magnesium: Used in the chemical industry as a raw material for the production of magnesium sulfate, magnesium hydroxide, and magnesium chloride. Building materials industry used in the production of magnesium mobile housing, magnesium fertilizer production raw materials, waste acid water and agent, heavy metal ion adsorbent.

Industrial magnesium oxide: also known as light magnesium oxide, in a large number of inorganic salt products occupy a very important position. Mainly used in the manufacture of ceramics, enamel, refractory materials; Used as filler in the manufacture of polishing agents, adhesives and paints; In the artificial fiber, rubber (neoprene rubber, fluorine rubber) in the accelerator and catalyst; In medicine used as antacid and laxative, for the treatment of excessive gastric acid, gastric and duodenal ulcer disease; In food processing, it can be used as decolorizing agent for sugar refining, PH regulator for ice cream powder, etc. In the construction industry, magnesium oxide can be produced and manufactured magnesia-containing special cement and insulation board; In agriculture, it is used as fertilizer and feed for livestock. It is the main element in the metabolic process of value and animals. When used as feed for dairy cows, it can prevent nervous system dysfunction caused by magnesium deficiency, namely the so-called pasture spasm. Used in the chemical industry to manufacture magnesium metal and magnesium chemicals, such as magnesium sulfate, magnesium oxide, and other chemicals; In addition, it is also used for water treatment, washing of flue gas and for glass, dye, cable, silicon steel industry, uranium processing, electronics industry, insulating material industry, as well as for oil additives, casting, phenolic plastics and other industries.

Heavy magnesium oxide: mainly used in the magnetic material industry, such as steel ball polishing, phenolic resin raw materials, dyes, etc.

Active magnesium oxide: Different from ordinary magnesium oxide requirements, such as suitable particle size distribution, micro-morphology of irregular particles or near-spherical particles or flake crystals. Because of its high activity and high dispersion, it can even be made into fibrous magnesium oxide, which is easy to compound with polymers or other materials. Because of its high dispersion, this kind of ultrafine magnesium oxide can also be used as a filler for paint, paper and cosmetics, as a filler and reinforcing agent for plastics and rubber, and as an auxiliary material for various electronic materials. The activity of magnesium oxide mainly depends on two factors: first, the particle size of magnesium oxide, the smaller the particle size, the larger the surface free energy, the higher the activity; The second is the crystallization of magnesium oxide, the more complete the crystallization, the fewer defects, the more stable, the lower the activity. High calcination temperature is conducive to the crystallization of magnesium oxide, the higher the temperature, the more complete the crystallization, the lower the activity.

High purity magnesia: refers to the content of more than 99%, volume density is greater than 3.4g%cm3 sintered magnesium oxide. High purity magnesia has good high temperature bending strength, slag resistance and corrosion resistance, which can improve the service life of lining of steel furnace, so it is widely used as lining refractory material of steel furnace.

Electromolten (fused) magnesium oxide: Electromolten magnesium oxide is one of the main products in the production of magnesium compounds in China. According to the purity, crystal, form and use of the obtained products, it can be roughly divided into the following product types: Magnesium oxide single crystal, magnesium oxide polycrystal, high purity fused magnesium oxide, electric heating appliances fused magnesium oxide and refractory industry fused magnesium oxide, ceramic materials industry, fused magnesium oxide, etc.

The amount of magnesium oxide whisker, magnesium peroxide, nano magnesium oxide in China is not very optimistic, which has special physical and chemical properties, relatively speaking, the content, density, hydrochloric acid insoluble matter is very special requirements, is expected to be developed as materials.