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Vertical distribution and historical loss estimation of heavy metals in an abandoned tailings pond at HTM copper mine, northeastern China
College of Land and Environment, Shenyang Agricultural University, Shenyang.
Research Institute of Land Reclamation and Ecological Restoration, China University of Mining and Technology (Beijing).
College of Land and Environment, Shenyang Agricultural University, Shenyang.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Number of Authors: 4
2016 (English)In: Environmental Earth Sciences, ISSN 1866-6280, E-ISSN 1866-6299, Vol. 75, no 22, 1462Article in journal (Refereed) Published
Abstract [en]

In the tailings pond of the Hongtou Mountain (HTM) copper mine in northeastern China, four sampling points were set at intervals of 80 m along the discharge direction of the tailings slurry to investigate the vertical distribution characteristics of heavy metals in shallow layer (0–5 m) tailings. In addition, 18 sampling points were set by a grid method (50 m × 50 m) to estimate the historical loss amount of contaminants from the surface layer (0–1.2 m) of the HTM tailings pond. Tailings samples were taken at every 0.2 m, and the pH value, the total content and acid-soluble fraction of heavy metals and chemical compositions were determined following the standard methods. The results showed that the pH values of tailings ranged from 3.01 to 8.11, which increased with depths from 0 to 2.2 m, and varied between pH values of 7.0 and 7.5 in 2.2–5 m. Cu, Zn, Cd and S were the major contaminants in the tailings. The total Cu content was higher at the downstream sampling points near the dam. Zn and Cd were higher at the upstream sampling points near the discharge. Three distinct zones (oxidised zone, cemented layer and unoxidised zone) were found in the HTM tailings pond. The depth of the oxidised zone was 0.4 m, and the elements in the oxidised tailings were obviously lower due to the sulphides oxidation and acid mine drainage. Cu was enriched in the cemented layer, and the Cu content reached values between 1200 and 3000 mg/kg, which were 1.5–3 times higher than the average value. Zn, Cd, Ni and Fe were also slightly elevated in the cemented layer. Below the groundwater table, the acid-soluble fraction of Cu, Zn and Cd was relatively stable at a lower level and showed insignificant variations, as the cemented layer and groundwater could efficiently prevent the oxidation process. The amount of Cu, Zn and Cd leaving the tailings pond with drainage water was 8.08, 21.60 and 72.93%, respectively, of the amount released from oxidation. Most of the Cu released from oxidation was retained in the cemented layer. The total mass of S, Zn and Cd released from the tailings to surrounding ecosystems was estimated approximately 762.75 t, 6997.5 and 86.06 kg, respectively, in the last 20 years.

Place, publisher, year, edition, pages
2016. Vol. 75, no 22, 1462
National Category
Geochemistry
Research subject
Applied Geochemistry
Identifiers
URN: urn:nbn:se:ltu:diva-60707DOI: 10.1007/s12665-016-6271-4OAI: oai:DiVA.org:ltu-60707DiVA: diva2:1049996
Note

Validerad; 2016; Nivå 2; 2016-11-28 (andbra)

Available from: 2016-11-28 Created: 2016-11-28 Last updated: 2016-11-28Bibliographically approved

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