Application and preparation method of light - burned magnesium oxide

Lightly burned magnesium oxide is used in the chemical industry to produce magnesium sulfate, magnesium nitrate, magnesium hydroxide, etc. It is used in the pharmaceutical industry to prepare antacids and laxatives. It is mainly used as decolorizer in food processing industry. As the main raw material of magnesium glass, it is mainly used to produce magnesium glass. The lightly burned magnesium oxide is mixed with magnesium chloride or magnesium sulfate solution in a certain proportion and can be gelatinized and hardened into a hardened body with certain physical and mechanical properties. Therefore, it is called magnesium cement. Magnesium cement, as a new type of cement, has the advantages of light weight, high strength, fire insulation, energy saving and environmental protection. It can be widely used in building materials, municipal engineering, agriculture, machinery and other fields of decorative board. Partitions, sanitary fittings, suspended ceilings, floor tiles, ventilation ducts, sewage covers, fireproof doors and Windows, fireproof panels, artificial stones, imitation wood products, roofing materials, arts and crafts and abrasive moulds, stoves, fireworks and solids.

Light burned magnesia refers to the 700-900 degrees centigrade high temperature formed by magnesium compound after calcined magnesia ore, also known as active magnesium oxide, chemical formula MgO style, relative molecular weight of 40.3, melting point 2800 ℃, boiling point of 3600 °, odourless, tasteless, non-toxic, insoluble in water and organic solvents, as a result of the existence of carbon dioxide, dissolve in acid or ammonium salt solution, easy deliquescence, gradually absorb carbon dioxide from the air and water, so in the water solubility increases. Form magnesium carbonate double salt.

Preparation of light burned magnesium oxide:

Magnesite, magnesite and magnesium hydroxide extracted from sea water or brine are calcined at 800~1000℃ and decomposed to produce CO2 or H2O. This is a kind of magnesium powder calcined lightly, also known as light calcined magnesium oxide, caustic magnesium oxide or light calcined magnesium, which is usually called bitter earth powder. Light calcined magnesia has loose texture and great chemical activity, which can be used to make magnesium cement, magnesite building materials, insulation materials, etc., and can also be produced by two-step calcining method.