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Experimental Determination of Liquidus Temperature and Phase Equilibria of the CaO–Al2O3–SiO2–Na2O Slag System Relevant to E-Waste Smelting

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Rare Metal Technology 2021

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

The recovery of valuable and critical metals from electronic wastes (e-waste) via the pyrometallurgical route has some challenges including high processing temperatures. Designing appropriate slag systems based on the major elemental components in e-waste could bring operational advantages by lowering the liquidus temperature. In this study, the quaternary slag system CaO–Al2O3–SiO2–Na2O was investigated to determine the liquidus temperature and phase equilibria of slags relevant to e-waste smelting. The slags were thermally equilibrated at different temperatures inside a vertical tube furnace followed by rapid quenching. The quenched slags were examined by SEM to observe the phase formed and the equilibrium compositions were determined using energy dispersive (ED) spectrometry. The liquidus temperature of the slags in the anorthite (CaO·Al2O3·2SiO2) phase field was significantly decreased with increasing levels of Na2O. The slag composition moved towards the pseudo wollastonite (CaO·SiO2) region upon the addition of Na2O.

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Authors and Affiliations

  1. Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University, GPO Box 2476, Melbourne, VIC, 3001, Australia

    Md Khairul Islam, James Tardio & Suresh Bhargava

  2. CSIRO Mineral Resources, Private Bag 10, Clayton South, VIC, 3169, Australia

    Md Khairul Islam, Michael Somerville, Mark I. Pownceby & Nawshad Haque

  3. Bangladesh Council of Scientific and Industrial Research (BCSIR), IMMM, Joypurhat, 5900, Bangladesh

    Md Khairul Islam

Authors
  1. Md Khairul Islam
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  2. Michael Somerville
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  3. Mark I. Pownceby
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  4. James Tardio
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  5. Nawshad Haque
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  6. Suresh Bhargava
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Corresponding author

Correspondence to Md Khairul Islam .

Editor information

Editors and Affiliations

  1. University of Toronto, Toronto, ON, Canada

    Gisele Azimi

  2. The University of Tokyo, Tokyo, Japan

    Takanari Ouchi

  3. KTH Royal Institute of Technology, Stockholm, Sweden

    Kerstin Forsberg

  4. Pennsylvania State University, University Park, PA, USA

    Hojong Kim

  5. University of Saskatchewan, Saskatoon, SK, Canada

    Shafiq Alam

  6. University of Ilorin, Ilorin, Nigeria

    Alafara Abdullahi Baba

  7. IND LLC, South Jordan, UT, USA

    Neale R. Neelameggham

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Islam, M.K., Somerville, M., Pownceby, M.I., Tardio, J., Haque, N., Bhargava, S. (2021). Experimental Determination of Liquidus Temperature and Phase Equilibria of the CaO–Al2O3–SiO2–Na2O Slag System Relevant to E-Waste Smelting. In: Azimi, G., et al. Rare Metal Technology 2021. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65489-4_26

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