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Magnesium oxide (chemical formula: MgO) is magnesium oxide, an ionic compound. It is a white solid at room temperature. Magnesium oxide exists in nature in the form of periclase, and is the raw material for magnesium smelting.
Magnesium oxide has high fire resistance and insulation properties. After being burned at a high temperature above 1000°C, it can be transformed into crystals. When it rises to 1500-2000°C, it will become burnt magnesia (also called magnesia) or sintered magnesia.
There are two types: light magnesia and heavy magnesia. Lightweight and loose in volume, it is white amorphous powder. Odorless, tasteless and non-toxic. The density is 3.58g/cm3. It is hardly soluble in pure water and organic solvents, and its solubility in water increases due to the presence of carbon dioxide. It can be dissolved in acid and ammonium salt solution. It is converted into crystals after high temperature burning. In case of carbon dioxide in the air, it will generate magnesium carbonate double salt. The heavy matter is compact in volume and is white or beige powder. It is easy to combine with water, and it is easy to absorb moisture and carbon dioxide in the exposed air. It is easy to gel and harden when mixed with magnesium chloride solution.
With the upgrading of industrialization and the demand and development of the high-tech functional material market, a series of high-tech and fine magnesium oxide products have been developed and produced, which are mainly used for high-grade lubricants, high-grade tanning alkali-extracting grade, food grade, medicine, silicon steel grade, high-grade It is composed of nearly ten varieties including electromagnetic grade and high-purity magnesium oxide.
Mainly used in the production of magnesite products. The light-burned magnesia and the magnesium chloride aqueous solution are combined in a certain proportion, which can be gelled and hardened into a hardened body with certain physical and mechanical properties, which is called magnesite cement. As a new type of cement, magnesite cement has the advantages of light weight, high strength, fire resistance, heat insulation, energy saving and environmental protection, and can be widely used in building materials, municipal administration, agriculture, machinery and other fields.
Magnesium oxide is commonly known as bitter soil, also known as magnesia. Magnesium oxide is an alkaline oxide, which has the generality of alkaline oxides and is a cementing material. White powder (light yellow is magnesium nitride), odorless, tasteless, non-toxic, is a typical alkaline earth metal oxide, chemical formula MgO. White powder, melting point is 2852℃, boiling point is 3600℃, and relative density is 3.58 (25℃). Soluble in acid and ammonium salt solution, insoluble in alcohol. The solubility in water is 0.00062 g/100 mL (0 °C)
0.0086 g/100 mL (30 °C). When exposed to the air, it is easy to absorb water and carbon dioxide and gradually become basic magnesium carbonate. Light products are faster than heavy products. It combines with water to form magnesium hydroxide under certain conditions, showing a slightly alkaline reaction, and the pH of a saturated aqueous solution Is 10.3. It is soluble in acid and ammonium salt and hardly soluble in water, and its solution is alkaline. Insoluble in ethanol. It has strong refraction in the visible and near ultraviolet range. Magnesite (MgCO3), dolomite (MgCO3•CaCO3) and sea water are the main raw materials for the production of magnesium oxide. Thermal decomposition of magnesite or dolomite obtains magnesium oxide. Treat seawater with slaked lime to get magnesium hydroxide precipitation, and burn magnesium hydroxide to get magnesium oxide. It is also possible to use the magnesium chloride halide obtained in the comprehensive utilization of seawater or the brine after bromine extraction as the raw material, add sodium hydroxide or sodium carbonate to produce magnesium hydroxide or basic magnesium carbonate precipitation, and then burn to obtain magnesium oxide. China mainly uses magnesite, dolomite, brine or brine lump as raw materials.