Magnesium oxide
Magnesium oxide has been continuously developed in recent years and has been widely used in various fields. Magnesium oxide is a white powder that exists in the form of free magnesite in nature. The main component of magnesite is magnesium carbonate, and the main component of dolomite is eutectic of MgCO3 and CaCO3. The specific gravity of artificial marble is 3.65-3.9, the melting point is 2800 ° C, and the relative molecular weight is 40.3. According to the different production processes and uses, magnesium oxide can be roughly divided into the following categories:
Calcined Magnesium Oxide
According to the operating temperature: magnesia made from raw magnesite calcined at high temperature is calcined magnesia; magnesia calcined by coke at 1400-1800°C is dead-burned magnesia, also known as dead-burned magnesia; coal or gas is used as fuel Magnesium oxide fired at 700-1000℃ is light fired powder, also known as caustic magnesium; low-grade magnesium oxide fired by mixing low-grade magnesite and anthracite, also known as bitter earth powder.
The chemical composition of magnesite is MgCO3, the relative molecular weight is 84.31, MgCO3 is the main component, SiO2, CaO, Al2O3, Fe2O3 are the secondary components, and the content of MgO is usually 35%-47%, and dead-burned magnesia is mainly used for Refractory materials are also used in the manufacture of magnesia-chrome bricks and calcium-magnesium-carbon bricks, insulation fillers for electric heating and electrical components, feed, building materials and other fields.
Industrial Magnesium Oxide
Industrial magnesium oxide is also called light magnesium oxide. The bulk density is between 0.2-0.3g/ml. The magnesium oxide prepared from MgCl 6H2O or sea brine as raw materials belongs to light magnesium oxide and is produced by dolomite carbonization. Magnesium oxide is also classified as light magnesium oxide.
Light magnesium oxide is an odorless, tasteless, non-toxic white amorphous powder, mainly used in the manufacture of enamels, ceramics, refractories, etc.; as a filler in the production of polishing adhesives and paints; in rayon, rubber, etc. (Fluorine rubber, neoprene rubber) as accelerators and catalysts; in food processing as decolorizing agents in sugar refining, ice cream powder PH regulators, etc.; in medicine as laxatives and antacids for treatment Duodenal ulcer and hyperacidity; in agriculture as animal feed and fertilizer; in the construction industry, it can produce special cement and insulation boards containing magnesium.
In addition, it can also be used for water treatment, flue gas cleaning, and has applications in cables, glass dyes, uranium processing, silicon steel industry, insulating material industry, petroleum additives, electronics industry, casting, phenolic plastics and other industries.
Heavy Magnesium Oxide
The bulk density of heavy magnesia obtained by light-burned magnesia after deep processing and separation of impurities is between 0.5-0.7g/ml. Heavy magnesium oxide can replace light magnesium oxide in magnetic materials for color TV deflection coil (ferrite soft magnetic) and other ferrite magnetic materials; it acts as a polishing agent in the steel ball polishing industry; it is used in the dye industry as the production of aminophenol Accessories; electrical industry as the raw material of phenolic resin. Secondly, it also has applications in ceramic glass, industrial catalyst, feed, and environmental protection industries.
Activated Magnesium Oxide
Activated magnesium oxide is one of many varieties of magnesium oxide products. Activity refers to the ease of reaction of magnesium oxide, which is determined by the thickness of magnesium oxide solid particles (determined by specific surface area).
Some indicators of activated magnesium oxide are different from those of ordinary magnesium oxide. If there is a suitable particle size distribution, the average particle size is less than 2μm (2000nm); the microscopic shape is irregular particles or nearly spherical particles or flaky crystals. The activity indicated by the value) is 12 25s (the smaller the value, the higher the activity); the activity represented by the iodine absorption value is 80～120 (mgI / 100gMgO); the specific surface is between 5～20m / g, and the apparent specific volume is 6 Between 8.5ml/g.
It can be said that heavy magnesium oxide is pure Mg0, and light magnesium oxide is xMg0*YMg(OH)2, namely basic magnesium oxide, in which the percentage of light magnesium oxide plays an important role in the activity. Generally, high-activity magnesium oxide is obtained by decomposing basic magnesium carbonate at low temperature for a long time. The furnace structure is special, the energy consumption is high, and the apparent specific volume of the product is large.
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