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High purity magnesia

High purity magnesia

  • category:High purity magnesia
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  • Release date:2020-09-09 14:36:11
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Magnesia can be divided into two categories: natural magnesia and seawater magnesia or synthetic magnesia. Natural magnesia mainly comes from natural magnesite and light burned magnesia powder. However, 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 magnesium oxide", and further heating Above 1530℃, it becomes inactive periclase and becomes hard burned magnesia, which is called "dead burnt magnesia". The synthetic seawater magnesia used in 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, and its high temperature strength is the highest high.

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