Is light burned magnesia the same

Light burned magnesia and active magnesia are two concepts


Light burned magnesia (MgO) is also known as magnesia, commonly known as magnesite, light burned powder and magnesia powder. 94, light yellow or white powder. Melting point 2852 ℃, boiling point 3600 ℃. It is soluble in acid and ammonium salt, but insoluble in water and ethanol. The specific surface area is 180 m2 / g at 400 ℃. The specific surface area is only 3 m2 / g at 1300 ℃. Easy to deliquescence in the air. It belongs to gas hard cementation material.


Light burned magnesia is also called caustic bitter soil, active magnesia. It is a kind of light burned magnesia obtained by calcining natural magnesite ore, brucite and Mg (OH) 2 extracted from seawater or brine at 700 ~ 1000 ℃.


Active magnesium oxide


Molecular weight: 40.30 MgO activity refers to the ability of MgO to participate in chemical or physicochemical processes, which is essentially due to the unsaturation of valence bonds on the surface of primary crystal, which is aggravated by lattice distortion and defects. The difference of activity is mainly due to the size and incomplete structure of MgO crystal. Active magnesium oxide is different from common magnesium oxide in the following aspects


1) The particle size distribution is suitable, the average particle size is generally less than 2 μ m, and the micro morphology is irregular particles or near spherical particles or flake crystals; 2) it has certain activity, which can be indicated by citric acid activity (CAA value) (the smaller the value is, the higher the activity is), or by iodine absorption value.


Activated magnesium oxide dew is placed in the air to absorb water and carbon dioxide, which reduces its activity and sometimes needs to be protected by chemical treatment. Other properties are the same as light magnesium oxide.