Precious Metal Distributions Between Copper Matte and Slag at High PSO2 in WEEE Reprocessing

Min Chen, Katri Avarmaa, Lassi Klemettinen, Hugh O’Brien, Junjie Shi, Pekka Taskinen, Daniel Lindberg, Ari Jokilaakso*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The distributions of precious metals (gold, silver, platinum, and palladium) between copper matte and silica-saturated FeOx-SiO2/FeOx-SiO2-Al2O3/FeOx-SiO2-Al2O3-CaO slags were investigated at 1300 °C and PSO2 = 0.5 atm. The experiments were carried out in silica crucibles under flowing CO-CO2-SO2-Ar gas atmosphere. The concentrations of precious metals in matte and slag were analyzed by Electron Probe X-ray Microanalysis and Laser Ablation-High-Resolution Inductively Coupled Plasma-Mass Spectrometry, respectively. The precious metal concentrations in matte and slag, as well as the distribution coefficients of precious metals between matte and slag, were displayed as a function of matte grade. The present results obtained at PSO2 of 0.5 atm were compared with previous results at PSO2 of 0.1 atm for revealing the effects of PSO2 and selected slag modifiers (CaO and Al2O3) on precious metal distributions at copper matte smelting conditions. The present results also contribute experimental thermodynamic data of precious metal distributions in pyrometallurgical reprocessing of electronic waste via copper smelting processes.

Original languageEnglish
Number of pages12
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
DOIs
Publication statusE-pub ahead of print - 25 Feb 2021
MoE publication typeA1 Journal article-refereed

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