synonymLight burned magnesia(Light burned magnesium oxide) generally refers to light burned magnesium
This entry is missingOverview, add relevant content to make the entry more complete, and it can also be upgraded quickly. Hurry upeditCome on!
Light burned magnesium is used tomagnesite、BruciteAnd magnesium hydroxide extracted from sea water or brine are calcined at about 800~1000 ℃ to make it decompose and discharge COtwoOr HtwoO.
It is widely used in building materials, chemical industry, metallurgy, medicine and other fields, and is an ideal material for the production of fireproof board, light partition board, magnesium sulfate, paper making, sulfur removal process, slag splashing in steel plant furnace protection, etc
Chinese name
Light burned magnesium
Foreign name
Caustic calcined magnesia
Alias
Light burned magnesia
Purpose
Building materials, chemical industry, metallurgy, medicine
Light burned magnesium is used tomagnesite、BruciteAnd extracted from seawater or brinemagnesium hydroxide After calcination at 800~1000 ℃, it will be decomposed to discharge COtwoOr HtwoO，That is to get light burned magnesium powder, also known as light burned magnesium oxide, caustic magnesium oxide or light burned magnesium, commonly known as tartar powder.Light burned magnesia powder has loose texture and high chemical activity. It can be used to manufacture magnesium cement, magnesite building materials, thermal insulation materials, etc., and it is also the intermediate product of two-step calcination method to produce high-quality magnesia.
When magnesite is heated, equiaxed crystal system appears at about 600 ℃Periclase；At 650 ℃, equiaxed periclase disappears and non equiaxed periclase occurs;The equiaxed periclase disappeared completely at 850 ℃.These periclase lattices have high surface energy due to the presence of point defects and dislocations.Lattice ratio of MgO MgCOthreeThe lattice group is not much smaller, so the pores between the lattices are increased, the porosity is high, the specific surface area is large, and the activity is high.[1]
Light burned magnesium powder is light yellow and light brown powder, and the particle size is mostly below 100 meshes. The periclase crystal is very small (less than 3 μ m), the true specific gravity is 3.07~3.22, and the bulk density is 0.8~1.2g/cmthree, refractive index 1.68~1.70, large lattice constant（α=0.4212) has many lattice defects, brittle texture, pore structure, high reactivity, easy to conduct solid phase reaction or sintering, and hardens by reacting with water to generate Mg (OH) 2, with bonding ability.Light burned magnesia powder calcined from magnesite has a volume shrinkage of about 5%;Generally, 3%~5% CO remains due to incomplete decompositiontwo。
The calcination temperature and time of magnesite have some influence on the activity of magnesite powder.Magnesite was calcined at 600 ℃, 650 ℃, 700 ℃, 750 ℃, 800 ℃, 850 ℃ and 900 ℃ respectively. The calcination temperature of 700 ℃, 750 ℃ and 800 ℃ had no obvious effect on the activity of light calcined magnesium powder within 15~90 minutes;600, 650, 850, 900 ℃ had a particularly significant effect on the activity. When calcined at 600, 650 ℃, the activity increased significantly with the extension of time;When calcined at 850 ℃ and 900 ℃, the activity decreased significantly with the extension of hydrocarbon calcination time.
purpose
Announce
edit
Light burned magnesium is widely used in building materials, chemical industry, metallurgy, medicine and other fields. It is an ideal material for the production of fireproof boards, light partition boards, magnesium sulfate, paper making, sulfur removal process, and slag splashing in steel plant furnace protection.
