Influence of the Precipitating Reagents and Dispersants on the Formation Nano-Aluminum Hydroxide
Influence of the Precipitating Reagents and Dispersants on the Formation Nano-Aluminum Hydroxide作者机构：Center of the Earth Sciences Metallurgy and Benefication JSC Science and Education Ministry of the Republic of Kazakhstan Almaty Kazakhstan Center of the Earth Sciences Metallurgy and Benefication JSC Science and Education Ministry of the Republic of Kazakhstan Almaty Kazakhstan National Science and Technology Holding “Parasat” JSC Science and Education Ministry of the Republic of Kazakhstan Astana Kazakhstan
出 版 物：《Journal of Materials Science and Chemical Engineering》 (材料科学与化学工程（英文）)
年 卷 期：2013年第1卷第5期
页 面：11-15页
主 题：Nano-Aluminum Hydroxide Precipitating Reagents Dispersants Alkaline Aluminate Solution Precipitation Particles Decomposition Particle Diameter
摘 要：The influence of the precipitating reagents and dispersants on the formation of nano-aluminum hydroxide from sodium aluminate solution by chemical precipitation was investigated. The influence of the dispersed seeds on the decomposi-tion process was investigated too. The alkaline aluminate solutions were used as original solutions with a concentration of Al2O3 having 14.78 g/dm3, αk—1.6 and127 g/dm3, αk—1.6. For the precipitation processes there were used follow-ing precipitating reagents—solutions HCl, NaHCO3 and NH4HCO3 with a concentration of 80 g/dm3, dispersants—PEG 6000, (NaPO3)6 and Tween 20. For the decomposition process the dispersed seeds and factories seeds were used. Structural studies of the aluminum hydroxide particles were carried out by means of the electron-probe microanalysis and scanning electron microscopy, and phase composition of products was determined by means of X-ray diffraction analysis. Ammonium bicarbonate and Tween 20 were determined as the optimal precipitating reagent and dispersant, correspondingly, resulting in dispersed aluminum hydroxide, which is used as a seed in the decomposition process. It was established that this product in form of dispersed seed considerably reduces the duration of the decomposition process;the maximal decomposition of solution (73.9%) was observed after injection of dispersеd aluminum hydroxide into solution. The final aluminum hydroxide having 90% of particles less than 100 nanometers was obtained within 7 hours of steady decreasing temperature from 70°C to 48°C.
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