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Magnesium oxide Magnesium oxide
Commonly known as: bituminous soil powder burning magnesium powder
Molecular formula: MgO style
Molecular weight: 40.30
CAS NO. : 1309-48-4
Physical properties: white light powder, odourless, tasteless, this product does not dissolve in water and ethanol, melting point 2852 ℃, boiling point 3600 ℃, magnesium oxide have highly refractory insulation performance. Through above 1000 ℃ high temperature burning can be transformed into crystal, rose to more than 1500 ℃ is dead burned magnesia and sintered magnesia.
Chemical properties: magnesium oxide is a basic oxide, with the properties of basic oxide
When exposed to air, it is easy to absorb water and carbon dioxide, and gradually becomes basic magnesium carbonate. Lightweight products are faster than heavy ones. When combined with water, magnesium hydroxide is generated, showing a slightly alkaline reaction. Soluble in acid and ammonium salts are insoluble in water and their solutions appear alkaline. Insoluble in ethanol.
With water slow action, the formation of magnesium hydroxide
Strong refraction in the visible and near ultraviolet range.
Classification: there are two types: light magnesium oxide and heavy magnesium oxide. Light and fluffy, white amorphous powder. No smell, no taste, no toxicity. Density of 3. 58 g/cm3. Insoluble in pure water and organic solvent, solubility in water increases due to the presence of carbon dioxide. Soluble in acid and ammonium salt solutions. It is transformed into crystals by burning at high temperature. Carbon dioxide in the air produces magnesium carbonate compound salt. A compact mass of white or beige powder. Water and easy to combine, exposed air easy to absorb moisture and carbon dioxide. When mixed with magnesium chloride solution, it is easy to gelatinize and harden.
Application field: determination of sulfur and pyrite in coal and sulfur and arsenic in steel. Used as a standard for white pigments. Light magnesia is mainly used as raw material for preparing ceramic, enamel, crucible and firebrick. Also used as a polishing agent binder [coating] and paper filler, neoprene and fluoroelastomers and activators. When mixed with magnesium chloride and other solutions, magnesia water can be prepared. Medically used as an antacid and laxative, in the case of hyperacidity of the stomach and two-finger ulcer. The chemical industry is used as a catalyst and raw material for the manufacture of magnesium salts. Also used in the release of glass, dyeing pulp, phenolic plastics and other manufacturing. Heavy magnesia is used in the milling industry for pulverizing and semi - roller. The construction industry is used to make artificial chemical flooring, artificial marble, thermally resistant and soundproof panels, and plastics industry is used as packing material. It can also be used to produce other magnesium salts.
It is mainly used in preparation of internal medicine to neutralize excessive gastric acid. Commonly used preparations are: magnesium emulsion - emulsion; Magnesium cover sheet -- each sheet contains mgo0.1g. Acid powder production - magnesium oxide and sodium bicarbonate mixture of powder and so on.
Properties: white powder, odorless, exposed to air, easy to absorb water and carbon dioxide, soluble in acid and ammonium salts, insoluble in water and ethanol, melting point 2800, boiling point 3600, magnesium oxide has high refractoriness insulation. (high melting point)
Application: used for rubber, plastics, wire, cable dyestuff, paint, glass, building materials, ceramics, chemical reagent, medicine, food additive etc.
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