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Aluminium Oxide Grit 24 Mesh Suppliers Germany

The dehydration of Al (OH) 3 is a complex process, from the dehydration of gibbsite to the final glass bead abrasive transformation into a-Al2O3. During this period, there are a series of changes, that is, there are a series of transition phases. In order to obtain alumina products with a certain content of a-Al2O3 and to accelerate the 220 grit aluminum oxide blast media calcination process, Al (OH) 3 should be calcined at about 1100 ℃ or higher (about 1200 ℃).


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The phase transformation of steel shot abrasive hydroxide when heated in air is of practical significance to alumina production. Y-al2o3 and its intermediate products obtained by calcination at low temperature have strong water absorption, while a-Al2O3 has no water absorption. There are two kinds of 1200 grit aluminum oxide crystal structure of Al2O3, one is that oxygen atoms are stacked in cube, the other is stacked in hexahedron. It is insoluble in ammonia solution, but it reacts with alkali hydroxide to form aluminate.


Therefore, the physical properties of garnet abrasive price and its hydrate are different. Such as dissolving in sodium hydroxide solution or sintering with sodium carbonate at high temperature to produce sodium aluminate. As we all know, alumina and aluminum hydroxide are typical amphoteric compounds, which are actually insoluble in water, but soluble in acids and bases. Most of the 100 grit aluminum oxide media atoms in the two kinds of crystals occupy the position of octahedron or tetrahedron.


Its refractive index, glass beads manufacturers density and hardness increase in the order of gibbsite, diaspore, white fused alumina. Their acidity and basicity are very weak, so the weak acid aluminum salt is hydrolyzed completely or mostly in the aqueous solution, but the strong acid aluminum salt is very stable. Al (OH) 3 is also a weak acid. The dissolution rate and solubility of different forms of 80 grit aluminum oxide blasting media and alumina hydrate in alkali and acid are different.


Bayerite and gibbsite are the most soluble, followed by diaspore, especially white aluminum oxide. Corundum has the strongest and densest lattice with large lattice energy, so its properties are also the most stable. Even at high temperature of 300 ℃, the reaction with acid and alkali is very slow. The aluminum oxide blast media 60 grit chemical activity of y-al2o3 is strong, especially when calcined at low temperature. The chemical activity of y-al2o3 is similar to that of gibbsite.


In white corundum production, ore dissolution conditions (temperature, alkali concentration and dissolution time) mainly depend on the mineral form of Al2O3, but their formation conditions can not be ignored. Because of the different formation conditions, even if the same form of 46 grit aluminum oxide, its properties are also very different, such as a-Al2O3 obtained by calcining diaspore at about 500 ℃. Its chemical activity and natural corundum, or a-Al2O3 obtained by calcining Al (OH) 3 at 1200 ℃.


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