scispace - formally typeset
Search or ask a question
Topic

Gibbsite

About: Gibbsite is a research topic. Over the lifetime, 1995 publications have been published within this topic receiving 48355 citations. The topic is also known as: hydrargillite & zirlite.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the interaction of water and the alumina surface is comprehensively reviewed and the role of surface charge on the adsorption of processing additives is briefly discussed, and the influence of these forces on suspension properties such as rheological behavior is outlined.
Abstract: The interaction of water and the alumina surface is comprehensively reviewed. Water can be incorporated in the alumina crystal structure resulting in the formation of aluminum hydroxides such as gibbsite. Alumina dissolves into water to an extent that depends primarily upon the solution pH and temperature. The soluble Al (III)aq species (hydrolysis products) likewise depend upon the solution pH, temperature, aluminum, and other salt concentrations. The development of charge on the surface of alumina is controlled by amphoteric surface ionization reactions. The charging behavior of both alumina powders and single crystal faces is compared. The differences can be explained by the reactivities of different types of surface hydroxyl groups. The substantial difference in surface charging behavior of single crystal sapphire and alumina powders indicates that experiments and modeling conducted on single crystals is of limited use in predicting suspension behavior. The atomic scale structure of the hydroxylated sapphire (0001) basal plane is nearly identical to the gibbsite (001) basal plane. The observed surface structures are consistent with the charging behavior of the surfaces. The role of surface charge on the adsorption of processing additives is briefly discussed. How surface charge and processing additives at the alumina aqueous solution interface influence surface forces between particles is reviewed. The influence of these forces on suspension properties such as rheological behavior is outlined. The importance of controlling these behaviors to improve colloidal ceramic powder processing is stressed.

231 citations

Journal ArticleDOI
TL;DR: In this article, high-quality Raman spectra were used for the characterization of alumina phases of gibbsite, bayerite, diaspore and boehmite.
Abstract: High-quality Raman spectra were used for the characterization of alumina phases of gibbsite, bayerite, diaspore and boehmite. The Raman spectrum of gibbsite shows four strong, sharp bands at 3617, 3522, 3433 and 3364 cm in the hydroxyl stretching region. The spectrum of bayerite shows seven bands at 3664, 3652, 3552, 3542, 3450, 3438 and 3420 cm. Five broad bands at 3445, 3363, 3226, 3119 and 2936 cm and four broad and weak bands at 3371, 3220, 3085 and 2989 cm-1 are present in the Raman spectrum of the hydroxyl stretching region of diaspore and boehmite. The hydroxyl stretching bands are related to the surface structure of the minerals. The Raman spectra of bayerite, gibbsite and diaspore are complex whereas the Raman spectrum of boehmite shows only four bands in the low-wavenumber region. These bands are assigned to deformation and translational modes of the alumina phases. A comparison of the Raman spectrum of bauxite with those of boehmite and gibbsite showed the possibility of using Raman spectroscopy for on-line processing of bauxites that contain a mixture of alumina phases.

228 citations

Journal ArticleDOI
TL;DR: The 2: 2 lattice building phenomenon in expansible 2: 1 layer silicates relates to layer charge density and crystal size and frequently tends to inhibit the formation of free gibbsite in soil chemical weathering so long as there are expansible layer silicate present to become intercalated with aluminum hydroxide, a weathering phenomenon that may be called an antigibbsite effect as discussed by the authors.
Abstract: Interlayering of 2: 1 layer silicates varies as a function of chemical weathering from the simple, homogeneous K or Na interlayers of micas to the heterogeneous systems of mica intercalated with expanded 2: 1 layer silicates. “Frayed edge” type of weathering at dislocation planes of mica is collated with K release and preferential cation-exchange uptake of K relative to Ca by such expansible layer silicate systems; mica islands maintain alignment of the silica sheet cavities, which facilitates recapture of lattice K. Intercalation of the expanded 2: 1 layer silicates with alumina interlayers appears to be a characteristic function of chemical weathering in soils, with the formation of 2: 1–2: 2 intergrades not only of 14 A spacing but also of swelling 18 A types that give small 12, 14, 18 A and higher spacing peaks (along with the 10 A peak) at 550°C. Interlayer precipitates appear to be characteristic of soil clays, contrasting with “pure” minerals of deposits developed in less “open” environments than those of soils. The “2: 2 lattice building” phenomenon in expansible 2: 1 layer silicates relates to layer charge density and crystal size, and frequently tends to inhibit the formation of free gibbsite in soil chemical weathering so long as there are expansible layer silicates present to become intercalated with aluminum hydroxide—a weathering phenomenon that may be called an “antigibbsite effect”. Accumulation of alumina (possibly with some iron, magnesium, and allophane) as interlayers in 2: 1 minerals of soils is seen as a genetic stage in the 2: 2 → 1: 1 weathering sequence through which kaolinite and halloysite develop in soils.

224 citations

Journal ArticleDOI
TL;DR: Li et al. as discussed by the authors reported new results on 48 bench samples of the CP2 coal from the adjacent Adaohai Mine, Daqingshan Coalfield, Inner Mongolia, and provided new insights into the origin and modes of occurrence of the minerals and elements present in the coal.

221 citations

Journal ArticleDOI
TL;DR: In this paper, a two-constant rate equation was developed which successfully described the rate of phosphate adsorption by hematite and gibbsite conformed to the Freundlich equation.
Abstract: The phosphate adsorption by hematite and gibbsite conformed to the Freundlich equation. The rate of phosphate adsorption was rapid initially and decreased with prolonged reaction time. A two-constant rate equation was developed which successfully described the rate of phosphate adsorption. T

218 citations


Network Information
Related Topics (5)
Sorption
45.8K papers, 1.3M citations
84% related
Freundlich equation
27.6K papers, 941.4K citations
80% related
Organic matter
45.5K papers, 1.6M citations
79% related
Adsorption
226.4K papers, 5.9M citations
78% related
Desorption
37.7K papers, 985.5K citations
77% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202365
2022107
202148
202059
201944
201873