High-purity aluminum oxide with small primary crystal and production method of high-purity aluminum oxide

Abstract

The invention discloses a high-purity aluminum oxide with a small primary crystal and a production method of the high-purity aluminum oxide, belonging to the technical field of aluminum oxide preparation. The high-purity aluminum oxide with the small primary crystal is characterized in that a primary crystal of aluminum oxide has the average diameter of 0.1-0.3 mum and the grain size D50 of 0.5-3.0mum, and the aluminum oxide has the purity of 99.997-99.999%. A production method of the high-purity aluminum oxide comprises the following process steps of liquefying, removing impurities, filtering, crystallizing, cleaning, drying, changing phases and the like and is characterized in that a crystallizing process comprises the following steps of: diluting fine sodium meta-aluminate liquid obtained after filtering, adding salicylic acid and sodium dodecyl benzene sulfonate, carbonating in a multi-stage carbon dioxide introducing way, controlling the decomposition rate to be up to 90-99% to generate slurry. According to the invention, the direct production of the high-purity aluminum oxide with the small primary crystal is realized, the process of ball-milling or jet-milling pulverization is omitted, and the pollution and the cost are reduced. Physical indexes such as grain size distribution, apparent density, specific surface area and the like can meet most of special requirements in the current market.

Description

technical field [0001] The invention belongs to the technical field of alumina preparation, and relates to a small primary crystal high-purity alumina and a production method thereof. Background technique [0002] At present, the methods for producing high-purity alumina on the market include aluminum ammonium sulfate method, choline dissolution method, and high-purity aluminum hydrolysis method. ,Such as figure 2 As shown; or the size of the original crystal is relatively large, generally greater than 0.5 μm. If the market requires powders with small particle sizes, ball milling or jet milling is required to crush them to the corresponding particle size, thereby increasing the possibility of pollution and improving the quality of multiple processes. production cost. With the current high-purity alumina market expanding, many application fields have higher and higher requirements for high-purity alumina particle size and other physical indicators, and most of the physical ...

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Problems solved by technology

[0002] At present, the methods for producing high-purity alumina on the market include aluminum ammonium sulfate method, choline dissolution method, and high-purity aluminum hydrolysis method. ,like figure 2 As shown; or the size of the original crystal is relatively large, generally greater than 0.5 μm. If the market requires powders with small particle sizes, ball milling or jet milling is required to crush them to the corresponding particle size, thereby increasing the possibility of pollution and improving the quality of multiple processes. cost of production

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