Results 141 to 150 of about 1,254 (182)

Gibbsite scaling on polymer surfaces

Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 2012
Gibbsite scale build up was studied over a range of polymer surfaces in real Bayer process conditions. For all samples there was an initial slow rate of scale growth and there was evidence that this growth proceeded along scratches on the polymer surfaces. The high density polyethylene, acrylonitrile butadiene styrene and polypropylene homopolymer took
Eoin P Enright, Teresa Curtin, John Haines, Kenneth T Stanton   +3 more
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Synthesis and Characterization of Gibbsite Nanostructures

The Journal of Physical Chemistry C, 2008
Single-crystal gibbsite nanorods with a high aspect ratio were synthesized by a facile hydrothermal method. Characterizations by HRTEM, SAED, and XRD revealed that the nanorods prefer to grow along the c-axis. The nanorods can be easily transformed to chi-alumina by calcination at 250 degrees C, while the nanorod morphology is well-maintained.
Ye Liu, Ding Ma, Ross A. Blackley, Wuzong Zhou, Xiuwen Han, Xinhe Bao   +5 more
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Conditions for the formation of bayerite and gibbsite

Mineralogical Magazine, 1971
SummaryAluminium hydroxide gels have been prepared by the hydrolysis of amalgamated aluminium in water and by precipitation from aluminium salt solutions with an anion exchange resin in the hydroxyl form. The products crystallizing from such gels have been examined by electron microscopy and by X-ray and electron diffraction.
W. J. Mchardy, A. P. Thomson
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Studies on the Gibbsite to Boehmite Transition

Separation Science and Technology, 2008
Abstract The transition of gibbsite to boehmite is of interest with regard to high level waste processing associated with the Hanford and Savannah River sites. Both materials have been observed in core samples. From the temperature histories of the waste, it is possible that some fraction of gibbsite has been converted to boehmite. This paper describes
T. J. Ruff, R. K. Toghiani, L. T. Smith, J. S. Lindner   +3 more
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Kinetics and hydrothermal transformation of gibbsite

Journal of Thermal Analysis, 1991
The transformation of gibbsite have been studied under hydrothermal influence. Results of the X-ray diffraction analysis of the samples heated at different temperatures from 170°C to 265°C are also discussed in detail. The percentage of the boehmite phase formed, due to the transformation of the gibbsite, have been determined by comparing the intensity
S. K. Mehta, A. Kalsotra
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The kinetics of gibbsite dissolution in NaOH

Hydrometallurgy, 2009
Abstract The dissolution of aluminum hydroxides from bauxite ores constitutes a key process in the aluminum industry. Generally, aluminum minerals in bauxites are present in the form of gibbsite and/or boehmite. Kaolinite, an aluminosilicate that is also present in bauxites, is a critical contaminant of the process. The understanding of the effect of
Janaína A.M. Pereira, Marcio Schwaab, Enrico Dell'Oro, José Carlos Pinto, José L.F. Monteiro, Cristiane A. Henriques   +5 more
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Kinetics of silicate reaction with gibbsite

Journal of Colloid and Interface Science, 1991
The reaction of silicate with gibbsite in sodium aluminate solution was studied. Sorption kinetics indicated that sorption of silicate was surface-induced. Silicate is believed to have adsorbed and precipitated as sodium aluminum silicate (SAS) on gibbsite by a three-step reaction; a first fast step, a lag period step, and a slow step.
Kofi Adu-Wusu, William R. Wilcox
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AN OCCURRENCE OF GIBBSITE IN EAST YORKSHIRE

Proceedings of the Yorkshire Geological Society, 1967
(Short communication) In an examination of the Cave Oolite, of Middle Jurassic age, in the Cockle Pits, approximately one and a quarter miles NNW. of Brough Church, the following section was measured: | | | | | |
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A Gibbsite-Cemented Quartz Sandstone

SEPM Journal of Sedimentary Research, 1984
ABSTRACT A gibbsite-containing quartz sandstone occurs near Fort Walton, Florida. Scanning electron micrographs show the gibbsite of the matrix to be anhedral which is the typical morphology in many deposits of bauxite. At the contact surface with the quartz grains, however, the gibbsite crystals are euhedral, as if recrystallized from solution.
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Gibbsite crystallization inhibition

Hydrometallurgy, 2000
Helen Watling, Joanne Loh, Helen Gatter
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