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Erschienen in: Metallurgical and Materials Transactions A 6/2017

28.03.2017

Relationships Between Smelter Grade Alumina Characteristics and Strength Determined by Nanoindentation and Ultrasound-Mediated Particle Breakage

verfasst von: Hasini Wijayaratne, Grant McIntosh, Margaret Hyland, Linus Perander, James Metson

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 6/2017

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Abstract

The mechanical strength of smelter grade alumina (SGA) is of considerable practical significance for the aluminum reduction process. Attrition of alumina during transportation and handling generates an increased level of fines. This results in generation of dust, poor flow properties, and silo segregation that interfere with alumina feeding systems. These lead to process instabilities which in turn result in current efficiency losses that are costly. Here we are concerned with developing a fundamental understanding of SGA strength in terms of its microstructure. Nanoindentation and ultrasound-mediated particle breakage tests have been conducted to study the strength. Strength of SGA samples both industry calcined and laboratory prepared, decrease with increasing α-alumina (corundum) content contrary to expectation. The reducing strength of alumina with increasing degree of calcination is attributed to the development of a macroporous and abrasion-prone microstructure resulting from the ‘pseudomorphic’ transformation of precursor gibbsite during the calcination process.

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Metadaten
Titel
Relationships Between Smelter Grade Alumina Characteristics and Strength Determined by Nanoindentation and Ultrasound-Mediated Particle Breakage
verfasst von
Hasini Wijayaratne
Grant McIntosh
Margaret Hyland
Linus Perander
James Metson
Publikationsdatum
28.03.2017
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 6/2017
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-017-4080-3

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