Dissolution of copper and nickel from nickel-rich anode slimes under oxidized pressure leaching

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-01-01
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Mcode
Degree programme
Language
en
Pages
Series
Mineral Processing and Extractive Metallurgy: Transactions of the Institute of Mining and Metallurgy
Abstract
Anode slimes are valuable by-products in the electrolytic copper refinery process. This study aimed to investigate maximum extraction efficiency of Cu and Ni from slimes originating from the electrorefining of anodes containing high [Ni]. In addition, the extractions of Se, Te, As and Bi were determined. A factorial leaching series was conducted with T = 140–160°C, [H2SO4] = 12–20%, pO2= 2–8 bars and solid/liquid ratio = 200–400 g/L. The highest Ni extraction of 99.7% was obtained with [H2SO4] = 20%, pO2 = 8 bar and T = 160°C while maintaining S/L ratio of 200 g/L. The extraction of copper was found to be within 97–99% in all the leaching experiments. Increasing acidity and decreasing S/L ratio increased the efficiency of Cu extraction. Mineralogical characterizations by SEM-EDX demonstrated the presence of Ag2Se, BaSO4, PbSO4 and several oxide phases in the leach residue.
Description
Keywords
Autoclave, copper electrorefining, extraction efficiency, hydrometallurgy, modelling, secondary metal sources, sulphuric acid leaching, valorization
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Citation
Mohanty , U S , Kalliomäki , T , Seisko , S , Peng , C , Rintala , L , Halli , P , Aromaa , J , Taskinen , P & Lundström , M 2019 , ' Dissolution of copper and nickel from nickel-rich anode slimes under oxidized pressure leaching ' , Mineral Processing and Extractive Metallurgy: Transactions of the Institute of Mining and Metallurgy . https://doi.org/10.1080/25726641.2019.1670008