1990
DOI: 10.1007/bf01914141
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The dehydroxylation of aluminium hydroxides and the kinetics ofα-Al2O3 formation

Abstract: Studies were made of the dehydroxylation of several aluminium hydroxide modifications and the kinetics of a-A1203 formation. The investigated samples differed in both mineral composition and the level of alkali admixtures. It was found that the rate of formation and the quantity of a-A1203 depend mainly on the purity of the aluminium hydroxides, while the transition forms of alumina depend on the initial type of the aluminium hydroxide.Alumina is currently a valuable construction material in the various branch… Show more

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Cited by 12 publications
(7 citation statements)
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“…The peak observed for both the materials at around 480–500°C is due to the dehydroxylation of boehmite phase. Therefore, the transition forms of various aluminas occur after this temperature only and there may not be any hydroxide phase above 500°C [1]. A similar behaviour is also observed for fine ATH particles of sizes 1 and 0.25 μm indicating that boehmite formation with ATH of low particle size is also a possibility particularly for precipitated particles.…”
Section: Resultsmentioning
confidence: 79%
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“…The peak observed for both the materials at around 480–500°C is due to the dehydroxylation of boehmite phase. Therefore, the transition forms of various aluminas occur after this temperature only and there may not be any hydroxide phase above 500°C [1]. A similar behaviour is also observed for fine ATH particles of sizes 1 and 0.25 μm indicating that boehmite formation with ATH of low particle size is also a possibility particularly for precipitated particles.…”
Section: Resultsmentioning
confidence: 79%
“…The process of dehydration of gibbsite (aluminium hydroxide, γ‐Al(OH) 3 ) was studied extensively and is a very complicated process as reported in numerous research publications [1–17]. The dehydration sequence of γ‐Al(OH) 3 and the formation of α‐Al 2 O 3 is accomplished through various metastable processes (transition alumina).…”
mentioning
confidence: 99%
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“…27 Al NMR spectra for the reference solutions N1-N6 prepared by conventional hydrolysis correspond well to the previously reported data 11-13 (see Figure 5). The freeze-drying of the sols results in white, very friable, nonhygroscopic powders (F ∼ 0.05 g/cm 3 ). The as-prepared samples are amorphous to X-ray and electron diffraction.…”
Section: Resultsmentioning
confidence: 99%
“…Pyzalski et Wojcik (1990) obtiennent par exemple une température pour la fin de transformation de l'alumine gamma en alumine alpha de 1350°C, ce qui se rapproche beaucoup de la température obtenue par le modèle.…”
Section: Transferts De Chaleur Dans Le Fourunclassified