Recovery of Metals from Copper Smelting Slag Using Coke and Biochar

Min Chen*, Dmitry Sukhomlinov, Pekka Taskinen, Joseph Hamuyuni, Radoslaw M. Michallik, Mari Lindgren, Ari Jokilaakso

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Pages (from-to)360-374
Number of pages15
JournalJournal of Sustainable Metallurgy
Issue number1
Early online date29 Feb 2024
Publication statusPublished - Mar 2024
MoE publication typeA1 Journal article-refereed


  • Circular economy
  • Hazardous materials
  • Reduction
  • Resource efficiency
  • Slag cleaning


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