Enhanced soil washing with copper recovery using chemical precipitation
Artikel i vetenskaplig tidskrift, 2019

Worldwide, the number of contaminated sites is large, and remediation methods including recovery of metals have potential to be key aspects of a sustainable and circular economy. Soil washing, followed by chemical precipitation is a possible method for recovery of metals. The purpose of this study is to propose a complete recovery method, where Cu is efficiently leached from samples with contaminated bark ash and soil. Thereafter the Cu is precipitated as metal hydroxide. The results show that pH is the most important parameter that controls the leaching of Cu. The leaching process was independent of the liquid to solid ratio (L/S) for the soil, while the leaching increased with the L/S ratio for the bark ash. The shaking method used for leaching affected the results, as a low leaching efficiency was achieved with the turn-over-end technique used. The final Cu precipitation product from the bark ash contained ≥40 wt % Cu, whereas the corresponding soil precipitation product contained ≤15 wt % Cu. The conclusion is that the bark ash precipitation product is of interest for further refining within the metal industry. Due to inefficient leaching and washing, the soil and bark ash residues left after leaching are classified as hazardous waste.

Hg ion exchanger

Metal leaching

Contaminated soil

Metal recovery


Soil remediation


Karin Karlfeldt Fedje

Recycling and Waste Management

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Ann-Margret Hvitt Strömvall

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Journal of Environmental Management

0301-4797 (ISSN) 1095-8630 (eISSN)

Vol. 236 68-74









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