Magnesite-rich mining tailings as a raw material for refractory ceramics: Microstructural and thermal analysis

Marjaana Karhu; Juha Lagerbom; Soili Solismaa; Elina Huttunen-Saarivirta

doi:10.3176/proc.2019.2.05

Magnesite-rich mining tailings as a raw material for refractory ceramics: Microstructural and thermal analysis

Marjaana Karhu, Juha Lagerbom, Soili Solismaa, Elina Huttunen-Saarivirta

Geological Survey of Finland (GTK)

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

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 language	English
Pages (from-to)	145-149
Journal	Proceedings of the Estonian Academy of Sciences
Volume	68
Issue number	2
DOIs	https://doi.org/10.3176/proc.2019.2.05
Publication status	Published - 1 Jan 2019
MoE publication type	A1 Journal article-refereed

Funding

The research was supported by the Academy of Finland, project CeraTail funding decision # 292563, and by the Strategic Research Council at the Academy of Finland, project CloseLoop, funding decision #303453. The publication costs of this article were covered by the Estonian Academy of Sciences.

Keywords

Magnesium aluminate spinel
Mining tailings
Refractory ceramics
Value from waste

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10.3176/proc.2019.2.05

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Magnesite-rich mining tailings as a raw material for refractory ceramics: Microstructural and thermal analysis

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Keywords

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