Novel fluxing strategy of copper matte smelting and trace metals in E-Waste recycling

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
Series
Minerals Engineering, Volume 191
Abstract
The distribution behavior of trace metals between copper matte and spinel-saturated iron silicate slags was investigated at 1250 °C and pSO2 of 0.25 atm at low silica concentrations. The experiments were conducted in magnetite (Fe3O4) spinel crucibles in controlled CO-CO2-SO2-Ar gas mixtures using a high-temperature equilibration-quenching technique. The concentrations of trace elements in matte, spinel, and slag were quantified by electron probe X-ray microanalysis and laser ablation-inductively coupled plasma-mass spectrometry. The trace metals (Ag, Ni, Co, and Sn) in all phases and their distribution coefficients were calculated as a function of matte grade. Results show that silver and nickel can be effectively recovered into matte, whereas cobalt and tin are predominantly deported into slag and gas phases, respectively. These results augment the fundamental thermodynamic data of trace metal distributions in copper smelting processes at low-silica fluxing practices.
Description
Funding Information: This study was partly financially supported by Aalto University, School of Chemical Engineering. Min Chen acknowledges the financial support from the China Scholarship Council [number #201806370217]. RAMI (Raw Materials Infrastructure) by Academy of Finland hosted by Aalto University, VTT and GTK at Otaniemi Campus was used in this investigation. Publisher Copyright: © 2022 The Author(s)
Keywords
Circular economy, Flash smelting, Fluxing practice, Minor elements, Sustainability, WEEE
Other note
Citation
Chen , M , Avarmaa , K , Taskinen , P , Klemettinen , L , Michallik , R , O'Brien , H & Jokilaakso , A 2023 , ' Novel fluxing strategy of copper matte smelting and trace metals in E-Waste recycling ' , Minerals Engineering , vol. 191 , 107969 . https://doi.org/10.1016/j.mineng.2022.107969