Magnesium oxide is commonly known as bitter soil, also known as magnesia. Magnesium oxide is a basic oxide with the general nature of the oxide,and it belongs to the cementitious material.Its features are explained as follows: white powder (yellowish magnesium nitride), odorless, tasteless, non-toxic,and is a typical alkaline earth metal oxide.Its chemical formula is MgO.Also,its melting point is 2852 ℃, boiling point is 3600 ℃, the relative density is 3.58 (25 ℃). It is soluble in acid and ammonium salt solution and  insoluble in alcohol.Its Solubility in water is 0.00062 g / 100 mL (0 ° C).

When exposed to air,it will easily absorb moisture and carbon dioxide and gradually become a basic magnesium carbonate, light weight products are faster than heavy ones, When combined with water, it will become generate magnesium hydroxide under certain conditions and show a slightly alkaline reaction, saturated aqueous solution pH is 10.3.  It has strong refraction in the visible and near UV range. Magnesite (MgCO3), dolomite (MgCO3 · CaCO3) and sea water are the main raw materials for the production of magnesium oxide. Magnesia can be found from thermal decomposition of magnesite or dolomite.Hydrochloric acid is precipitated by treating lime with hydrated lime, and magnesium hydroxide is obtained by burning magnesium hydroxide. It can also be used in seawater comprehensive utilization of magnesium chloride lumps or bromine after Brine as raw material, add sodium hydroxide or sodium carbonate generated magnesium hydroxide or basic magnesium carbonate precipitation, and then burning can create magnesium oxide. China mainly uses magnesite, dolomite, brine or halogen as raw material.

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