I plant to ensure product quality through rigorous manual screening of semi-finished products, the product and less burning burnt items stripped out, so as to achieve better control of content and activity of magnesium oxide. I plant products activity stable, high content. In the production of magnesium and magnesium products can fully be reflected in the chloride ion does not appear anti-alkali, anti-halogen, violent and so on. Especially suitable for inorganic glass, steel, magnesium hydroxide, Firewood, lightweight body panels, greenhouse frame, ventilation pipes, Magnesite covers mold, activity room, crafts, and other building materials.