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Alkali Fusion–Leaching Process for Non-Standard Copper Anode Slime (CAS)

Jovana Djoki´ c, Nataša Gaji´ c

2025enmetallurgycopperecologyleachingelectronic waste

Abstract

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Copper anode slime (CAS), obtained from non-standard anodes by pyro-hydrometallurgical electronic waste (e-waste) processing, contains high concentrations of lead, tin (as metas-tannic acid), and base (Cu, Fe, Zn), precious (Au, Ag), and technological metals (In, Ga, Ge), which limit the efficiency of conventional valorization methods. In this study, an integrated alkali fusion–leaching process was applied to non-standard CAS. Thermodynamic modeling defined the key parameters for selective phase transformations and efficient metal separation. These parameters were experimentally investigated, and the optimized fusion conditions (CAS:NaOH = 40:60, 600 °C, 60 min), followed by water leaching (200 g/dm3, 80 °C, 60 min, 250 rpm), resulted in >97% Sn removal efficiency. Simultaneously, Au and Ag losses were negligible, resulting in solid residue enrichment. Oxidant addition (NaNO3) further enhanced the recovery of precious metals.

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Cite This Work

@article{c554fb62-4def-450b-b5b3-f6acfbe99a0a,
  title={Alkali Fusion–Leaching Process for Non-Standard Copper Anode Slime (CAS)},
  author={Jovana Djoki´ c and Nataša Gaji´ c},
  year={2025},
  language={en}
}
TY  - JOUR
TI  - Alkali Fusion–Leaching Process for Non-Standard Copper Anode Slime (CAS)
AU  - Jovana Djoki´ c
AU  - Nataša Gaji´ c
PY  - 2025
LA  - en
ER  -

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