| 1. |
- Hällström, Lina, et al.
(författare)
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Metal Release from Acidic and Near-Neutral pH-Conditions in Historical W, Cu and F Skarn Tailings at Yxsjöberg, Sweden
- 2018
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Ingår i: 11th ICARD | IMWA | WISA MWD 2018 Conference. - 9780620806503 ; , s. 351-356
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Konferensbidrag (refereegranskat)abstract
- Weathering products stored in the pore water and/or as easily soluble salts in historical skarn tailings containing Be, Bi, Cu, W, and Zn, were released in water soluble fraction in the upper-most acidic tailings, at the visual oxidation front (1.5m), and/or below 2.5m (pH>7). Thus, there is a risk that these metals can pollute receiving waters by neutral mine drainage. Re-mining the tailings could be a suitable remediation method that would both reduce the environmental impact and simultaneously support the supply of metals.
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| 2. |
- Nigéus, Susanne, et al.
(författare)
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Monitoring a field application of a Green Liquor Dregs-till mixture in a sealing layer on top of sulfidic mine waste
- 2018
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Ingår i: 11th ICARD | IMWA | WISA MWD 2018 Conference. - 9780620806503 ; , s. 57-63
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Konferensbidrag (refereegranskat)abstract
- Sul dic mine waste le unattended and in contact with oxygen oxidize and have potential to produce acid rock drainage (ARD). A typical method in Sweden to stop sul de oxidation is to apply a dry cover on top of the mine waste. Using the non-hazardous industrial residue Green Liquor Dregs (GLD) in the cover is useful for the mining industry and the industry providing the residue and a large bene t for the environment. In this study, the e ectiveness of a mixture of till and 10 wt. % of GLD in a dry cover was studied by monitoring temperature, oxygen- and moisture content. e conclusion is that the sealing layer in una ected by frost, the oxygen concentrations are decreasing with time, but not in depth and the sealing layer with GLD-till mixture seem to be nearly saturated.
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| 3. |
- Sartz, Lotta, 1979-, et al.
(författare)
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Remediation of Historic Waste Rock by Injection of Green Liquor Dregs : Results From a Field Scale Trial, Gladhammar, Southern Sweden
- 2018
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Ingår i: Mine Water. - Pretoria, South Africa : Tshwane University of Technology. - 9780620806503 ; , s. 1124-1129
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Konferensbidrag (refereegranskat)abstract
- Mining in Gladhammar, southern Sweden started in the 15th century, generating waste rock containing copper, cobalt, and arsenic. During remediation (2011) some waste rock was preserved, due to its geoscienti- c value, and placed on a geomembrane surface. Eventually, it became apparent that it had a substantial environmental impact (pH 3.8, Cu 96 mg/L, Co 21 mg/L). In 2017, green liquor dregs was injected in order to increase pH and decrease trace element mobility. Ten months a er injection pH was 8.3 and concentrations of copper and cobalt 1.3 mg/L and 1.1 mg/L, respectively. Evaluation will continue for at least five years.
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| 4. |
- Åhlgren, Kristina, 1976-, et al.
(författare)
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Leaching of U, V, Ni and Mo from Alum Shale Waste as a Function of Redox and pH - Suggestion for a Leaching method
- 2018
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Ingår i: Mine Water. - Pretoria, South Africa : Tshwane University of Technology. - 9780620806503 ; , s. 782-787
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Konferensbidrag (refereegranskat)abstract
- Alum shale residues in the form of nes and ash were leached at di erent pH and redox conditions. Total concentrations and mineral analysis indicate loss of some elements in burned shale, and redistribution of others. Uranium and nickel were shown to be more leachable from nes than from ashes. Decreased pH favoured leaching of Ni, U and V, whereas increased pH resulted in increased leaching of molybdenum. Redox conditions a ected leaching of Mo and V, but not U and Ni. us the method can be used as an estimate for leaching at di erent redox and pH conditions.
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