The Heterogeneous Reactions of Recrystallised Aluminium Trihydroxide Precipitates with Alkaline-Earth Metal Hydroxide Solution: Kinetics and Mechanism

Packter, A.; Panesar, K. S.

doi:10.1515/zpch-1986-26703

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1991

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“…Thermal analysis of likely mixtures are reported in literature by Bratton [1] and Yamaguchi et al [5]. The mechanical mixtures were studied in order to clarify the effect on the spinel synthesis of the presence of mixed hydroxide and the importance of the mixing degree of the components, already shown in the literature [7,8].…”

Section: Introductionmentioning

confidence: 99%

Study of the thermal behaviour of hydroxide mixtures aimed at the preparation of Mg-Al spinels

Gusmano

Nunziante

Traversa

et al. 1991

Journal of Thermal Analysis

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The thermal behaviour of hydroxide mixtures aimed at Mg-AI spinel preparation is reported. The mixtures of hydroxides were prepared by precipitation reaction from Mg and A1 nitrate solutions, stoichiometrie to the spinel formation. Hydroxide mixtures with different phase distributions were investigated, prepared by varying the precipitation procedure. The results were related to the thermal behaviour of mechanical mixtures of separately precipitated hydroxides. The spinel formation was identified performing XRD analysis on powder samples heated at different temperatures. The coprecipitated mixtures are completely decomposed to spinel at 400~ The presence of the Mg-AI mixed hydroxide phase in the mixture is of primary concern to get spinel at low temperatures.

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Section: Introductionmentioning

confidence: 99%