Characterization of Aluminum Trihydroxide Crystals Precipitated from Caustic Solutions

Lee, Mei-Yin; Smith, P. G.; Lincoln, Francis; Reyhani, Manijeh

doi:10.1021/bk-1997-0667.ch012

Cited by 8 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We performed XRD analysis on the scale deposited on the gold substrate (Spectrograms not shown) and the results confirmed the presence of bayerite and gibbsite crystal phase. This is in agreement with Lee et al [10] that stated that bayerite is predominantly formed at room temperature while gibbsite formation is favored at high temperature.…”

Section: Aluminum Trihydroxide Morphologysupporting

confidence: 93%

Quartz crystal microbalance as a tool for scale deposition monitoring in Bayer process conditions

Brisach

Brisach-Wittmeyer

Bouchard

et al. 2012

Journal of Crystal Growth

View full text Add to dashboard Cite

Section: Aluminum Trihydroxide Morphologysupporting

confidence: 93%

Quartz crystal microbalance as a tool for scale deposition monitoring in Bayer process conditions

Brisach

Brisach-Wittmeyer

Bouchard

et al. 2012

Journal of Crystal Growth

View full text Add to dashboard Cite

“…The carbonation process is carried out in temperatures of room temperature (RT) to 80 • C [14][15][16][22][23][24] and duration times ranging from 5-8 h [25]. Lee et al [26] showed that higher temperatures (70 • C) favor the formation of gibbsite, while lower temperatures (RT) favor the formation of bayerite. Padilla et al [22] carried out the carbonation at RT, precipitating 97% of Al as boehmite and 20% of the silicon.…”

Section: Introductionmentioning

confidence: 99%

Carbonation of Sodium Aluminate/Sodium Carbonate Solutions for Precipitation of Alumina Hydrates—Avoiding Dawsonite Formation

et al. 2021

View full text Add to dashboard Cite

Experimental work has been performed to investigate the precipitation mechanism of aluminum hydroxide phases from sodium aluminate/sodium carbonate pregnant solutions by carbon dioxide gas purging. Such solutions result from leaching calcium aluminate slags with sodium carbonate solutions, in accordance with the Pedersen process, which is an alternative process for alumina production. The concentration of carbonate ions in the pregnant solution is revealed as a key factor in controlling the nature of the precipitating phase. Synthetic aluminate solutions of varying sodium carbonate concentrations, ranging from 20 to 160 g/L, were carbonated, and the resulting precipitating phases were characterized by X-ray diffraction analysis. Based on the results of the previous carbonation tests, a series of experiments were performed in which the duration of carbonation and the aging period of the precipitates varied. For this work, a synthetic aluminate solution containing 20 g/L free Na2CO3 was used. The precipitates were characterized with X-ray diffraction analysis and Fourier-transform infrared spectroscopy.

show abstract

“…Gibbsite, γ -Al(OH) 3 , has been studied for at least three reasons. Firstly, it is an important semi-manufacture product from the Bayer process in the aluminum production [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, it is an important semi-manufacture product from the Bayer process in the aluminum production [1][2][3]. Studies on Bayer liquors are largely motivated by the importance to improve the crystallization.…”

Section: Introductionmentioning

confidence: 99%

Seeded growth of monodisperse gibbsite platelets to adjustable sizes

Wijnhoven

2005

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Nanosized hexagonal gibbsite seeds are grown from a mixture of dissolved alumina alkoxides at 85 • C. Centrifugation reduces the polydispersity by 30%. The seeds can be grown further by adding them to a fresh alkoxide mixture and heating it. This procedure was repeated several times to obtain particles of 570 nm ± 11% diameter and a thickness of 47 ± 23%. No indications of a size limit were observed. The thus obtained particles may form easily a columnar phase. Individual gibbsite particles in solution can be seen by confocal microscope.  2005 Elsevier Inc. All rights reserved.

show abstract

Characterization of Aluminum Trihydroxide Crystals Precipitated from Caustic Solutions

Cited by 8 publications

References 0 publications

Quartz crystal microbalance as a tool for scale deposition monitoring in Bayer process conditions

Quartz crystal microbalance as a tool for scale deposition monitoring in Bayer process conditions

Carbonation of Sodium Aluminate/Sodium Carbonate Solutions for Precipitation of Alumina Hydrates—Avoiding Dawsonite Formation

Seeded growth of monodisperse gibbsite platelets to adjustable sizes

Contact Info

Product

Resources

About