Explain the difference between light burnt magnesia and active magnesia?

Light fired magnesium oxide: scientific name magnesium oxide. Lightly burn magnesium balls

It has a density of 2.94 and is pale yellow or white powder. It has a melting point of 2852℃ and a boiling point of up to 3600℃. It is soluble in acids and ammonium salts, but insoluble in water and ethanol. It is easily deliquescent in air. It belongs to the gas-hard cementing material.

Reactive magnesium oxide, molecular formula MgO

Its relative molecular mass is 40.30. Its chemical composition, physical form and other indicators are not much different from ordinary magnesium oxide, but some indicators of active magnesium oxide and ordinary magnesium oxide requirements are different; For suitable particle size distribution, average particle size: < 2&micro; m (2000nm); The microscopic morphology is irregular particles or near-spherical particles or flake crystals. The activity of citric acid (CAA value) was 12~25s (the lower the value, the higher the activity). The activity indicated by iodine absorption value was 80~120 (mgI2/100gMgO). Specific surface between 5~20m3/g, apparent specific volume between 6~8.5mL/g. In addition, because of its high activity and easy absorption of water, this magnesium oxide sometimes needs to be protected by chemical treatment. It has some special properties that conventional materials do not have, so it is widely used as a new material.

Use:

Active magnesium oxide is an important raw material for the preparation of high functional fine inorganic materials, electronic components, ink, harmful gas adsorbent. It is expected to be developed as cutting-edge materials under harsh conditions such as high temperature and high corrosion. It can also be used as fillers for paint, paper and cosmetics, fillers and reinforcing agents for plastics and rubber, and auxiliary materials for various electronic materials. Light fired magnesium oxide is a kind of natural magnesite, brucite and magnesium hydroxide Mg(OH)2 extracted from sea water or brine, obtained by calcination at 700~1000℃.

Light burned magnesium oxide is used in the chemical industry to produce magnesium sulfate, magnesium nitrate, magnesium hydroxide, etc., in the pharmaceutical industry for the preparation of antacids and laxatives, in the food processing industry is mainly used as a decolorizing agent, in the glass magnesium building materials industry, as the main raw materials of glass magnesium materials, mainly used in the production of glass magnesium material products, The light burning magnesium oxide and magnesium chloride or magnesium sulfate aqueous solution in a certain proportion, can be gelling and hardening into a certain physical and mechanical properties of the hardened body, so it is called magnesium cement, magnesium cement as a new type of cement, with light and high strength, fire insulation, energy saving and environmental protection advantages, can be widely used in building materials, municipal engineering, agriculture, machinery and other fields, such as decorative plate, Partition board, sanitary ware, ceiling, floor tile, ventilation pipe, sewage manhole cover, fireproof doors and Windows, fireproof board, artificial stone, imitation wood products, roofing materials, handicrafts and abrasive mold, stoves, firework primer and so on.