Experimental Study on the Phase Equilibrium of Copper Matte and Silica-Saturated FeO x-SiO2-Based Slags in Pyrometallurgical WEEE Processing

Min Chen, Katri Avarmaa, Lassi Klemettinen, Junjie Shi, Pekka Taskinen, Ari Jokilaakso*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The effects of the amphoteric and basic oxides alumina and lime on the phase equilibria of copper matte and silica-saturated slags were investigated at 1300 °C and PSO2 = 0.1 atm in a controlled CO-CO2-SO2-Ar gas atmosphere using a high-temperature isothermal equilibration technique followed by rapid quenching. The equilibrium phase compositions were obtained by Electron Probe X-ray Microanalysis. The relationship between the copper concentration in matte and the oxygen partial pressure, iron, and sulfur in matte was quantified. The pure iron-silicate slag exhibited the highest copper loss in slag, although the addition of alumina and lime decreased its value by approximately a quarter and a half, respectively, at a matte grade of 65 wt pct Cu. In contrast, copper and sulfur were highly distributed in the matte phase, and their deportment to the matte was favored by addition of alumina and lime.

Original languageEnglish
Number of pages12
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Early online date2 Jun 2020
DOIs
Publication statusE-pub ahead of print - 2 Jun 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • S-SI SYSTEM
  • HIGH PARTIAL PRESSURES
  • A-DEGREES-C
  • CONTROLLED GAS ATMOSPHERE
  • GAS/SLAG/MATTE/TRIDYMITE EQUILIBRIA
  • 1573 K
  • SMELTING SLAGS
  • PRECIOUS METALS
  • MINOR ELEMENTS
  • FAYALITE SLAG

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    SYMMET: Symbiosis of metals production and nature

    Jokilaakso, A., Klemettinen, L., Rämä, M., Ruismäki, R., Danczak, A., Revitzer, H., Kleemola, L. & Chen, M.

    01/11/201828/02/2021

    Project: Business Finland: Other research funding

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