cheap brown aluminum oxide wholesale suppliers usa

Due to electrostatic attraction, the oppositely charged ions in the aqueous solution are firmly adsorbed on the surface of the particles to form an adsorption layer. Outside the adsorption layer, due to the weak attraction, the less the number of ions with an unusual number are adsorbed, aluminum oxide abrasive and an ion concentration that gradually decreases The diffusion layer, beyond the limit of electrostatic attraction, ions move freely and are not affected by the electrostatic attraction of the particle surface.

At present, more than 90% of the alumina and aluminum hydroxide produced worldwide are produced by the Bayer process. In the process of seed decomposition of sodium aluminate solution, the molecular weight of the sodium aluminate solution is relatively low (about 1.6). At normal temperature, aluminum oxide grit hydroxide is added as a seed crystal and continuously stirred, and the Al2O3 in the solution slowly precipitates out as aluminum hydroxide.

Preparation of a-Al2O3 fine powder and ultrafine powder and ultrafine powder are also called fine powder and ultrafine powder. With its particle size as the criterion, a-Al2O3 fine powder with a particle size of not more than 90um is generally referred to as micropowder or ultrafine powder. The particle size limits of both fine powder and ultrafine powder are not unified in various industries. The refractory industry at home and abroad generally uses 5um as the limit between the two. For fine powder.

For ball mill pulverization, as the ball milling time increases, the fineness of the raw material becomes finer, and the speed of thinning is faster at the initial stage and slower at the later stage. This is because the pulverized fine powder forms aggregates under the action of molecular cohesion and prevents further pulverization; at the same time, the green carborundum fine powder acts as a buffer for large particles Effect, making larger unpulverized particles difficult to further pulverize.

Al2O3 is the main component in bauxite. The higher the content, the better. At present, the production of industrial alumina requires an aluminum-silicon ratio of not less than 3.0 to 3.5. Other oxides are regarded as impurities. SiO2 is a harmful impurity in the production of alumina by the alkaline method. The high content of SiO2 in bauxite will reduce the production efficiency of smelting brown corundum or the production of industrial alumina and increase the impurity component.

The quality requirements of high alumina bauxite include chemical composition, dehydration degree, particle size, etc., because these factors will affect the brown corundum smelting technical indicators and product quality to varying degrees. High alumina bauxite is the raw material to provide Al2O3, glass bead blasting media suppliers which is the main component of corundum. The higher the Al2O3 content, the better the various technical indexes of smelting corundum. 

Besides alumina, bauxite also contains SiO2, Fe2O3, TiO2, Ca0 and other impurities. According to the world bauxite output (130-150 million tons / year), the static guarantee period is more than 200 years. In 2002, the proven bauxite reserves in the world were about 25 billion tons, and the reserve base was about 34 billion tons. With the continuous expansion of aluminum consumption, the mining volume of bauxite is also increasing.

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