Role of carbonates in mitigation of metal release from mining waste. Evidence from humidity cells tests |
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| Authors: | H Holmström J Ljungberg B Öhlander |
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| Institution: | Division of Applied Geology, Lule? University of Technology, 97187, Lule?, Sweden, SE
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| Abstract: | Leaching of two contrasting types of sulphidic tailings in humidity cells has been performed. The release of heavy metals
and the oxidation rate have been studied. Tailings from the Laver mine contain a few percent sulphides and lack carbonates,
whereas tailings from the Stekenjokk mine are both sulphide- and carbonate-rich. The results showed that in the leachates
from the Laver samples, the metal concentrations increased and pH decreased with time, indicating an increased oxidation rate.
In the Stekenjokk samples, pH remained high during the experiment, thereby keeping the metal concentrations low in the leachates.
The oxidation rate also decreased with time, probably due to Fe-hydroxide coatings on sulphide surfaces. The results show
that addition of carbonates and the maintenance of a high pH not only reduce the solubility of heavy metals, but also decrease
the oxidation rate of sulphides.
Received: 20 January 1998 · Accepted: 2 April 1998 |
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| Keywords: | Humidity cell Sulphide oxidation Tailings Mine waste |
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