Phase equilibria studies of the “MnO”–Al2O3–SiO2 system in equilibrium with metallic alloy. Part 1: Development of the technique and determination of liquidus isotherms between 1 423 K and 1 523 K

Elien Haccuria; Peter C. Hayes; Evgueni Jak

doi:10.3139/146.111110

Article

Phase equilibria studies of the “MnO”–Al₂O₃–SiO₂ system in equilibrium with metallic alloy. Part 1: Development of the technique and determination of liquidus isotherms between 1 423 K and 1 523 K

Elien Haccuria , Peter C. Hayes and Evgueni Jak

Published/Copyright: October 10, 2014

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From the journal International Journal of Materials Research Volume 105 Issue 10

Abstract

Phase equilibria in the “MnO”–Al₂O₃–SiO₂ pseudo-ternary system in equilibrium with metallic alloy have been experimentally investigated in the temperature range from 1 423 K to 1 523 K. This study is a part of a broader research program on the phase equilibria in the Al₂O₃–CaO–Li₂O–“MnO”–SiO₂ system, which is of importance to the slags used in a novel pyrometallurgical process for recycling of electric car batteries. The experimental procedures involve equilibration of high purity powder mixtures at high temperatures, rapid quenching, and accurate measurement of phase compositions using electron probe X-ray microanalysis, which allow the slag liquidus temperatures to be determined. This paper is part 1 of a series of two papers and focuses on the improvement of the experimental methodology. A number of elementary reactions taking place in the samples have been identified, including the formation of a tridymite ring around the alloy particles, manganese oxidation and manganese vaporization. This enabled relevant modifications to the experimental methodology to be introduced. The liquidus at 1 423 K, 1 473 K and 1 523 K in the high silica area and the solid solubility data in the tridymite and rhodonite phases have been reported.

Keywords: Slags; Phase diagram liquidus; Manganese; MnO–Al2O3–SiO2

* Correspondence address, Miss Elien Haccuria, School of Chemical Engineering, Level 3, Chemical Engineering Building (74), The University of Queensland, 4072 QLD, Australia, Tel.: +61 431827629, E-mail: e.haccuria@uq.edu.au

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Received: 2014-02-11

Accepted: 2014-05-05

Published Online: 2014-10-10

Published in Print: 2014-10-14

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Articles in the same Issue

https://doi.org/10.3139/146.111110

Keywords for this article

Slags; Phase diagram liquidus; Manganese; MnO–Al2O3–SiO2