The magnesite is calcined at 750-1100°C and is called light burned. After light is burned, the product ground with an industrial grinding mill is called light burned magnesia powder, referred to as light burned powder. Since the burning loss of magnesite is generally about 50%, the content of magnesium oxide in the ore can be almost doubled through light burning. Therefore, light burning is the most effective MgO enrichment method. Light burned magnesia has high activity and is an ideal raw material for the production of high-density magnesia. Light burned magnesia is also used to make cementitious materials such as magnesium-containing cement, heat and sound insulation building materials, and ceramic raw materials. In addition, the light-burned magnesium after chemical treatment can be made into a variety of magnesium salts, which are raw materials in the fields of medicine, rubber, man-made fibers, and papermaking. Heavy-burned magnesia is made by calcination of magnesite at a high temperature of 1800℃. The specific processing flow is: natural super-grade magnesite ore is purified by flotation, light firing, fine grinding, high-pressure ball pressing, and ultra-high temperature oil shaft kiln calcination. . After high-temperature calcination, the carbon dioxide in the magnesite completely escapes and has high refractoriness. Returned magnesia is a refractory material for metallurgy. It can be used to manufacture magnesia bricks, chrome magnesia bricks, magnesia, metallurgical powder, fused magnesia, etc. It is used to smelt special alloy steels, non-ferrous metals, and precious metals for medium and high-frequency induction furnace linings. In addition, it can also be used as a high-temperature electrical insulation material.