Magnesia is also called sintered magnesia. It is calcined at high temperature from magnesite, brucite or magnesium hydroxide obtained by the reaction of seawater with lime milk, with strong hydration ability. Mainly used for making basic refractory materials, such as magnesia bricks, magnesia-aluminum bricks, and for laying steel furnace bottoms with many impurities. Magnesium oxide powder manufacturers

Magnesia can be divided into two categories: natural magnesia and seawater magnesia or synthetic magnesia. Natural magnesia is mainly derived from natural magnesite, but due to the quality of raw ore, it is difficult to obtain high-purity and high-quality products. So far, seawater magnesia has become the main source of magnesia used in industrialized countries. The theoretical content of MgO in magnesite is 47.3%, and the remaining impurities include CaO, SiO2, iron, etc. Magnesite is heated to 700℃~800℃ in the air to decompose, which is called "light burned magnesia", and further heating Above 1530℃, it becomes inactive periclase and becomes hard-burned magnesia, which is called "dead burnt magnesia". The synthetic seawater magnesia for industrial production is made from seawater and digested dolomite. The precipitated Mg(OH)2 is calcined to obtain MgO. The calcium to silicon ratio of the synthetic magnesia used for unfired bricks is 0.3~0.5, and the calcium to silicon ratio of high-purity seawater magnesia is above 1.7.