A Rapid Method for the Determination of Growth Rate Kinetic Constants: Application to the Precipitation of Aluminum Trihydroxide

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• 作者：Hervé ; Muhr ; Jean-Pierre Leclerc ; Edouard Plasari ; and Fré ; dé ; ric Novel-Cattin
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：1997
• 出版时间：March 1997
• 年：1997
• 卷：36
• 期：3
• 页码：675 - 681
• 全文大小：191K
• 年卷期：v.36,no.3(March 1997)
• ISSN：1520-5045

文摘

The growth rate kinetics of crystallization of aluminumtrihydroxide from caustic aluminatesolutions of aluminum-air batteries are studied in a laboratory batchisothermal precipitator.A method using high seed charges varying from 200 to 800 kg ofAl(OH)₃ per m³ of aluminatesolutions is developed for the rapid determination of kinetic constantsof the crystal growthrate expression. Thus, it is shown that growth rate increases withthe square of thesupersaturation, and the temperature effect on the growth rate followsan Arrhenius relationwith an activation energy term of E/R = 8164 K.It is also shown that the growth rate ofaluminum trihydroxide is very sensitive to impurities in the aluminumelectrodes and to additivesin the electrolytic solution. This method can be extended to otherprecipitation reactionscharacterized by very low crystal growth rates.