Results 171 to 180 of about 5,205 (220)

Halloysite and Gibbsite Formation in Hawaii

Clays and clay minerals (National Conference on Clays and Clay Minerals), 1960
AbstractDesilication and removal of bases from the basalitic rocks of the Hawaiian Islands produces large amounts of halloysite and gibbsite, together with variable quantities of allophane and nontronite, iron and titanium oxides, and amorphous mineral and gel material.The nature and relative abundance of intermediate and end products of weathering ...
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ANION ADSORPTION BY GOETHITE AND GIBBSITE

Journal of Soil Science, 1972
Summary The relationship between adsorption and pH, termed the adsorption envelope, varies with the p K a, of the conjugate acid of the anion, for several adsorbents in presence of an excess of specifically adsorbed anions.
F. J. HINGSTON, A. M. POSNER, J. P. QUIRK   +2 more
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Morphological characterisation of gibbsite and alumina

Powder Technology, 2002
By combining visualisation by scanning electron microscopy (SEM), optical microscopy (OM) with aniline as an immersion liquid and semiautomated image analysis procedures, the external and internal structures of different types of gibbsite and alumina particles have been characterised.
Belaroui, K., Pons, Marie-Noëlle, Vivier, Hervé   +2 more
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Radiolysis of thermally dehydrated gibbsite

Materials Chemistry and Physics, 2021
Abstract Aluminum hydroxide (gibbsite, Al ( OH ) 3 ) powders and their thermally dehydrated forms were rehydrated and irradiated with gamma rays to examine the effects of the collapse of the crystalline gibbsite structure as it is converted to alumina on the transport of precursors of molecular hydrogen to the surface.
Elizabeth Briley, Patricia Huestis, X. Zhang, K.M. Rosso, Jay A. LaVerne   +4 more
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THE MICROMORPHOLOGY OF GIBBSITE FORMS IN SOILS

Journal of Soil Science, 1977
Summary Using optical and scanning electron microscopy various forms of gibbsite are described in some tropical soils. In a lateritic soil from Zaire gibbsite occurs on argillans, in randomly oriented crystal sheets, as nodular aggregates infilling vughs and on ped faces.
H. ESWARAN, G. STOOPS, C. SYS
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Autoprecipitation of Gibbsite and Boehmite

2016
When thick bauxite slurry was heated up to 160°C, boehmite precipitation was observed and caused scale formation on the surface of heat exchangers in digestion step.
T. Harato, T. Ishida, K. Yamada
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ANION ADSORPTION BY GOETHITE AND GIBBSITE

Journal of Soil Science, 1974
Summary The desorption of specifically adsorbed (ligand exchanged) anions, such as phosphate, selenite, and fluoride, from the surface of gibbsite and goethite has been studied by repeatedly washing the adsorption complex with solutions of constant pH and ionic strength but containing no specifically adsorbable ...
F. J. HINGSTON, A. M. POSNER, J. P. QUIRK   +2 more
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Gibbsite‐Kaolinite Equilibria

Soil Science Society of America Journal, 1967
Abstract In order to help determine if the equilibria reached by soil mineral mixtures is that predicted on the basis of single minerals, two kaolinite samples were equilibrated individually and also with gibbsite of known stability. One set of samples was equilibrated from undersaturation, the other from supersaturation. Samples were
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Gibbsite in the weathered dartmoor granite

Geoderma, 1971
Abstract Gibbsite encountered in the weathered Dartmoor granite is an initial product of the weathering process; its occurrence is not indicative of an earlier humid tropical environment.
C.P. Green, M.J. Eden
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The removal of silicate from gibbsite

Hydrometallurgy, 1993
Abstract Desorption of silicate from the surface of gibbsite was studied under typical Bayer process conditions. Desorption of silicate declined with aging and with increasing temperature. Successive extractions increased the desorption of silicate, although desorption was more pronounced in the first extraction than in subsequent extractions.
Kofi Adu-Wusu, William R. Wilcox
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