Behaviour of Metals during Bioheap Leaching at the Talvivaara Mine, Finland

Tuovinen, Hanna, Pelkonen, Mila, Lempinen, Janne, Pohjolainen, Esa, Read, David, Solatie, Dina and Lehto, Jukka (2018) Behaviour of Metals during Bioheap Leaching at the Talvivaara Mine, Finland Geosciences, 8 (2). pp. 66-79.

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Abstract

The behaviour of base metals Ni, Zn, Cu, Co, Fe, and Mn, potentially toxic metals Pb, Cr, and Cd, and the radioactive elements, U and Th, in the Talvivaara mining process, Finland has been studied by tracing metal concentrations from the black schist ore, through ores subjected to bioheap leaching of varying duration, to pregnant leach solution (PLS), and solid process waste material deposited on site in gypsum waste ponds. It is apparent that Zn, Cu, Co, and Cd are leached from the ore in a similar manner and recovered efficiently in the PLS; however, Ni, though leached, was also found in the gypsum pond at relatively high concentrations. Relatively little Pb is released from the ore, but the small fraction that is mobilised accumulates in the gypsum pond. Of the radioactive constituents, Th is essentially immobile, whereas U is readily leached from the ore, again accumulating in gypsum pond waste. In addition, a laboratory-based sequential leach test was applied to assess the future leaching potential of metals from residual ore and process waste material under different environmental conditions.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Chemistry
Authors :	Name Email ORCID Tuovinen, Hanna Pelkonen, Mila Lempinen, Janne Pohjolainen, Esa Read, David d.read@surrey.ac.uk Solatie, Dina Lehto, Jukka
Date :	9 February 2018
DOI :	10.3390/geosciences8020066
Copyright Disclaimer :	© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords :	Mining; Bioheap leaching; Waste; Metals; Environmental effects
Depositing User :	Clive Harris
Date Deposited :	24 Sep 2018 08:12
Last Modified :	24 Sep 2018 08:24
URI:	http://epubs.surrey.ac.uk/id/eprint/849417

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