Preparation Of High Purity Alumina By Hydrolysis Of Alkoxide
Organoaluminum hydrolysis mainly includes alkoxide aluminum hydrolysis and alkyl aluminum hydrolysis process.
After the organoaluminum alkoxide is hydrolyzed, a sol is obtained, which is then processed to obtain a gel, which is decomposed and condensed to obtain an ultrafine powder precursor, and then a high-purity alumina powder is obtained.
AVANT today provides an in-depth explanation of the effect of aluminum isopropoxide hydrolysis in organoaluminum salts on α-Al2O3.
The purity of the aluminum sheet used is 99.9% (industrial grade refined aluminum) isopropanol (CH3) 2CHOH (chemically pure).
The surface of the selected aluminum sheet was washed with ethanol, then washed with clean water, dried, and placed in a round-bottomed flask. A certain amount of isopropanol and HgCl2 are added as catalysts, and the reaction is carried out in a constant temperature water bath to generate aluminum isopropoxide.
Aluminum isopropoxide is then rectified to obtain refined aluminum isopropoxide, and the refined aluminum isopropoxide is hydrolyzed under different conditions, and then calcined to obtain high-purity ultra-fine α-Al2O3.
Finally, through the prepared high-purity alumina, it is found that the hydrolysis of aluminum isopropoxide can produce high-purity alumina with a purity greater than 99.98% and a narrow particle size distribution range.
The pH value in the hydrolysis has a great influence on the hydrolyzate of aluminum isopropoxide. The calcination process of aluminum isopropoxide hydrolyzate transforms from boehmite gel through amorphous Al2O3 to stable α-Al2O3.
The process of preparing high-purity alumina by using aluminum alkoxide hydrolysis method is relatively complicated, and the production cost is relatively high.
However, the introduction of impurities can be avoided in the process, and the purity of the obtained product is very high, which can meet the requirements of the LED industry for the purity and stability of alumina products, and can also meet the requirements of the ceramic coating on the purity, particle size, and morphology. and other requirements.
