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Preparation of High Purity Al2O3 from Sodium Aluminate Solution by Carbon Decomposition and Pickling Assisted with Ultrasonic |
Received:May 28, 2018 Revised:May 30, 2018 |
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DOI:doi:10.3969/j.issn.1007-7545.2018.09.009 |
KeyWord:sodium aluminate solution; carbon; alumina |
Author | Institution |
litao |
贵州大学 材料与冶金学院 |
jinhuixin |
贵州大学 材料与冶金学院 |
liuhongling |
贵州大学 材料与冶金学院 |
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Abstract: |
Effects of decomposition temperature, CO2 concentration, Al2O3 concentration, and decomposition time on decomposition rate of Al2O3 were investigated. Acid pickling assisted with ultrasonic of aluminum hydroxide powder obtained from carbon decomposition on purity of alumina product was investigated. The results show that decomposition rate is 93% under the conditions including solution concentration of 105 g/L, αk of 1.50, carbonation decomposition temperature of about 60 ℃, CO2 concentration of 30.0%, and decomposition time of 4 h. Purity of Al2O3 is 99.87% produced from aluminum hydroxide powder by ordinary acid pickling. Purity of Al2O3 is 99.99% produced from aluminum hydroxide powder by acid pickling assisted with ultrasonic. |
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