Recovery of Metals from Copper Smelting Slag Using Coke and Biochar

With the purpose of recovering the metal values, in this study the copper slag was reduced by coke and biochar at 1250 °C in an argon gas atmosphere using the isothermal reduction/drop quenching technique. The phase compositions of metal, matte, and slag were determined using electron probe microana...

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Bibliographic Details
Published in:Journal of sustainable metallurgy 2024-03, Vol.10 (1), p.360-374
Main Authors: Chen, Min, Sukhomlinov, Dmitry, Taskinen, Pekka, Hamuyuni, Joseph, Michallik, Radoslaw M., Lindgren, Mari, Jokilaakso, Ari
Format: Article
Language:English
Subjects:
Argon
Coke
Copper
Copper base alloys
Earth and Environmental Science
Electron probe microanalysis
Environment
Materials recovery
Metallic Materials
Phase composition
Reducing agents
Research Article
Slag
Sustainable Development
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Summary:With the purpose of recovering the metal values, in this study the copper slag was reduced by coke and biochar at 1250 °C in an argon gas atmosphere using the isothermal reduction/drop quenching technique. The phase compositions of metal, matte, and slag were determined using electron probe microanalysis (EPMA). The effects of reduction time and amount of reductant were investigated. The distribution of elements between metal/matte and slag was ascertained based on the elemental concentrations determined by EPMA. It was found that copper concentration in slag can be effectively decreased to approximately 0.4–0.6 wt% within 5 min by coke and biochar. Copper and nickel can also be successfully recovered into the copper alloy phase once settling has been accomplished. Graphical Abstract
ISSN:2199-3823
2199-3831
DOI:10.1007/s40831-024-00793-7