Title: Effect of α<sub>k</sub> on Aluminium Trihydroxide Crystallization from Sodium Aluminate Soluntion under Ultrasound <sup></sup>
Abstract: The ultrasound intensification crystallization process of aluminium trihydroxide from seeded sodium aluminate solution is investigated with various α k (the molecule ratio of Na 2 O/Al 2 O 3 ). The experiment results indicate that ultrasound intensification can enhance precipitation ratio of seeded sodium aluminate solution, while large α k does not good to improvement of the precipitation under ultrasound. When α k is 1.45, 2.0 and 2.5, the precipitation ratio increase 2.5%, 2.0% and 0.9%, respectively under ultrasound intensification. The mechanism of enhancement on precipitation of alumina hydrate is acoustic cavitations that enhance or alter reactions process of aluminate ions, Al (OH) - 4 . The mass percentage of precipitation production grain size <45μm is increased by 4.3 % under ultrasound intensification with initial α k at 2.0, which is the biggest. Key words: ultrasound; sodium aluminate solution; precipitation; aluminium trihydroxide
Publication Year: 2011
Publication Date: 2011-12-01
Language: en
Type: article
Indexed In: ['crossref']
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