8-10mm回转窑用镁铝砖原料尖晶石 窑炉工业窑炉用保温材料

Introduction of spinel

Spinel spinel is gens mineral, gem grade are mainly refers to the magnesium aluminate spinel, chemical formula of MgAl2O4, is a kind of magnesium aluminum oxide, the main components in aluminum oxide and magnesium oxide, belongs to the cubic system, crystal morphology of octahedral and octahedral and dodecahedron diamond shape, vitreous luster, transparency, refractive index of , homogenate, hardness of 8, 3.58 4.62 g/cm3 density, conchoidal fracture. Pink and red spinel red fluorescence distributed in long and short wave ultraviolet light. Magnesium aluminate spinel is widely used in refractory material, steel smelting, cement rotary kiln and glass kiln.

Spinel is composed of magnesium aluminum oxide mineral, because of containing magnesium, iron, zinc, manganese and so on elements, they can be divided into a lot of kinds, such as aluminum spinel, hercynite spinel, zinc, manganese spinel, chrome spinel etc. Because contain different elements and different spinel can have different colors, such as magnesium spinel in red, blue, green, brown, or between the colorless; Zinc spinel is green; Spinel is black, and so on. Spinel is hard vitreous octahedron or particle and block. 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.

The classification of magnesium aluminum spinel

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. According to the index 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 are divided into: magnesium rich spinel, rich spinel aluminum spinel and activity.

Spinel characteristics

Sintered alumina magnesia spinel has good erosion resistance, corrosion resistance, spalling resistance capability is strong, good slag resistance, strong abrasion resistance, good thermal stability, high temperature resistant characteristics. Fused spinel has the secret of high temperature resistant, body, bibulous rate is low, small thermal expansion coefficient, good thermal stability, strong ability to resist erosion characteristics.

Fused magnesium aluminate spinel with a purity of 98.5% or more industrial alumina and a purity of 96% or more light burning magnesium and distribution into the right amount of high purity magnesite (MgO style > 47%) mixtures, Canon of high temperature melt in arc furnace synthetic refractory raw material, the grain growth is good, dense texture, uniform structure, is made of high strength, good thermal shock stability spinel (periclase advanced refractory products of a kind of high-grade raw materials).