Handling trace elements in WEEE recycling through copper smelting-an experimental and thermodynamic study

Min Chen, Katri Avarmaa, Pekka Taskinen, Lassi Klemettinen, Radoslaw Michallik, Hugh O'Brien, Ari Jokilaakso*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Recycling of waste electrical and electronic equipment (WEEE) is attracting increasing attention, due to the presence of valuable metals and the risk of environmental emissions associated with WEEE disposal. In this study, the distributions of trace elements (Ag, Ni, Co, and Sn) between copper alloy and magnetite/wüstite-saturated iron silicate slags were investigated at 1200–1300 °C and PO2 of 10-10-10-6.5 atm, simulating the conditions of WEEE reprocessing through secondary copper smelting and converting. The high-temperature isothermal equilibration experiments were conducted in synthesized magnetite/wüstite crucibles under controlled CO-CO2 atmospheres followed by quenching in an ice-water mixture. The phase compositions and concentrations of the trace elements in copper alloy, magnetite/wüstite, and slag were determined by Electron Probe X-ray Microanalysis and Laser Ablation-High-Resolution Inductively Coupled Plasma-Mass Spectrometry. The distribution coefficients of all investigated trace elements between copper alloy and slag increased with decreasing oxygen partial pressure and increasing temperature. Ag distributed strongly into the copper alloy at all conditions, whereas Co mainly deported into the slag phase. Ni and Sn were concentrated in the alloy at lower PO2 and in the slag at higher PO2. Varying concentrations of Ni, Co, and Sn were also dissolved into the solid magnetite/wüstite phase.

Original languageEnglish
Article number107189
Number of pages14
JournalMinerals Engineering
Volume173
Early online date13 Sep 2021
DOIs
Publication statusE-pub ahead of print - 13 Sep 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Circular economy
  • Copper smelting
  • Resource efficiency
  • Trace elements
  • WEEE

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