マグネシウムオキシド

化学的特性マグネサイトは化学式MgCO3で表される鉱物であり炭酸マグネシウムの一種ですこの鉱物は地球のマントルから表面まで広く分布しており特に岩石が風化する過程で生成されやすい特性を持っていますマグネサイトは炭酸塩鉱物として鉄マンガンコバルトニッケルといった他の金属とも共存することがあります

化学的特性Magnesium oxide forms a finely divided white particulate dispersed in air.

化学性质白色固体，水に難溶。水と反応すると水酸化物となり塩基性を示す。

製造方法Magnesium oxide is easily formed by burning magnesium metal ribbon. Mg oxidizes and emits a bright white light, rich in ultraviolet and hard to extinguish. Extreme care must be taken if MgO is to be prepared by this method. Magnesia is a white solid mineral that occurs naturally as “Periclase” and is used as a source of magnesium metal. Magnesium oxide is hygroscopic in nature and care must be taken to protect it from moisture. It reacts with water and forms the hydroxide: MgO＋H2O→Mg(OH)2 However, this reaction can be reversed by heating it to remove moisture.

Magnesium oxide occurs naturally as the mineral periclase. It can be manufactured by many processes. Limestone containing the mineral dolomite is calcinated at high temperatures to produce dolime, which then reacts with magnesium chloride-rich sea water to produce magnesium hydroxide and calcium chloride.The magnesium hydroxide is then calcinated to produce magnesium oxide and water. In another process, mined magnesite (MgCO3) is calcinated to produce magnesium oxide and carbon dioxide. Purification methods include crushing and size separation, heavymedia heavymedia separation, and froth flotation. Producing magnesium oxide from sea water is a process that involves heating magnesium chloride concentrated brine from the Dead Sea. The magnesium chloride decomposes into magnesium oxide and hydrochloric acid.Magnesium oxide may also be produced by the thermal decomposition of magnesium chloride, magnesium sulfate, magnesium sulfite, nesquehonite, and the basic carbonate 5MgO·4CO2·5H2O. Purification of the magnesium oxide produced through thermal degradation is carried out by filtration or sedimentation.

製造方法酸化マグネシウム，金属マグネシウムを空気中で熱すると得られるが、工業的には、炭酸マグネシウム（マグネサイト）、水酸化炭酸マグネシウム、水酸化マグネシウムなどを煆焼(かしょう)して製造する。

合成方法マグネシアともよばれ，炭マグ法とソーダ法がある。

定義本品は、マグネシウムの酸化物であり、次の化学式で表される。

定義Two forms are produced, one a light, fluffy material prepared by a relatively low-temperature dehydration of the hydroxide, the other a dense material made by high-temperature furnacing of the oxide after it has been formed from the carbonate or hydroxide.