Introduction of spinel

Spinel belongs to a kind of aluminum and magnesium oxide, the main components in aluminum oxide and magnesium oxide. Magnesium aluminum spinel has naturally occurring and synthetic two kinds, the former is MgAL2O4 or Mgo style, AL2O3. Spinel theory content is: MgO style = 28.3% M, AL2O3 = 71.7%. Natural magnesia spinel rarely found that magnesium aluminum spinel in industrial application are all synthetic. Synthesis of magnesium aluminium spinel and fused two main methods are sintering method. Most spinel material is made from high purity synthetic chemical and alumina grade magnesium oxide, which in shaft kiln sintering and fused in arc furnace.

Spinel available heat treatment to improve the color. In the 900 ℃ heating into green blue, heated to 1200 ℃ to yellow. This kind of changing color effect is stable. Will also have red spinel heat remove brown to obtain pure red.

 

Spinel classification

Alumina magnesia and fused spinel with sintering, the method of two kinds of production process. Raw materials mainly magnesite and industrial alumina powder or bauxite. Different points on basis of magnesium oxide and alumina magnesium rich spinel and rich aluminum spinel and applied to different fields.

1, according to the production process or method points: sintered alumina magnesia spinel (sintered spinel) and fused alumina magnesia spinel, fused spinel).

2, according to the production of raw materials can be divided into: bauxite alumina magnesia spinel with alumina aluminum magnesium spinel (sintered or fused).

3, according to the content and performance: divided into magnesium rich spinel, rich spinel aluminum spinel and activity.

Fused spinel advantages: the representative intermittent operation of the process, the castable block need to extend the cooling time, in the microstructure of the casting block cooling leads to uneven, due to rapid cooling, outside of the spinel is smaller than the inside of the body, low melting point impurity concentration at the center, because need to sorting are fused spinel raw material.

 

Spinel purposes

Sintering alumina magnesia spinel is used for cement rotary kiln, not only avoid the chromium pollution, but also has good resistance to spalling. Sintered alumina magnesia spinel used in ladle castable, greatly improve the erosion resistance of steel lining, the sintering alumina magnesia spinel refractory material is widely used in steelmaking. Quality of preparing for amorphous and setting high purity spinel refractories production provides a new raw material.

Fused alumina magnesia spinel is manufacturing skateboarding, the gate brick, brick is the ideal material of open hearth furnace. Magnesium aluminum spinel products of high temperature mechanical performance is good, is a large cement kiln neutral cement kiln filter with the basic materials of kiln furniture, refractory castable, high school. Fused alumina magnesia spinel used in steel smelting, glass kiln.