Magnesite-rich mining tailings as a raw material for refractory ceramics

Microstructural and thermal analysis

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In this paper, we present results of a study about the possibilities of utilizing talc ore mining tailings as a refractory raw material aiming at magnesium aluminate MgAl2O4 spinel composition. The mine tailings are rich in magnesite but contain also other minerals such as talc, chlorite, dolomite, and iron sulphides. As alumina source for spinel synthesis, we studied also another secondary raw material, an aluminium hydroxide precipitate, a by-product generated from the pickling process of aluminium anodizing. The goal of this paper is to study and compare a pure Mg–Al–O system and the corresponding Mg–Al–O system with some impurities. The formed phase and microstructures were examined by XRD, FESEM, and EDS studies. The thermal behaviour was studied using thermogravimetric analysis.

Original languageEstonian
Pages (from-to)145-149
Number of pages5
JournalProceedings of the Estonian Academy of Sciences
Volume68
Issue number2
DOIs
Publication statusPublished - 1 Jan 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • Magnesium aluminate spinel
  • Mining tailings
  • Refractory ceramics
  • Value from waste

Cite this

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title = "Magnesite-rich mining tailings as a raw material for refractory ceramics: Microstructural and thermal analysis",
abstract = "In this paper, we present results of a study about the possibilities of utilizing talc ore mining tailings as a refractory raw material aiming at magnesium aluminate MgAl2O4 spinel composition. The mine tailings are rich in magnesite but contain also other minerals such as talc, chlorite, dolomite, and iron sulphides. As alumina source for spinel synthesis, we studied also another secondary raw material, an aluminium hydroxide precipitate, a by-product generated from the pickling process of aluminium anodizing. The goal of this paper is to study and compare a pure Mg–Al–O system and the corresponding Mg–Al–O system with some impurities. The formed phase and microstructures were examined by XRD, FESEM, and EDS studies. The thermal behaviour was studied using thermogravimetric analysis.",
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Magnesite-rich mining tailings as a raw material for refractory ceramics : Microstructural and thermal analysis. / Karhu, Marjaana; Lagerbom, Juha; Solismaa, Soili; Huttunen-Saarivirta, Elina.

In: Proceedings of the Estonian Academy of Sciences, Vol. 68, No. 2, 01.01.2019, p. 145-149.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Karhu, Marjaana

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