Forsterite and pyrrhotite dissolution rates in a tailings deposit obtained from column leaching experiments and inverse modeling: A novel method for a mine tailings sample

Embile, Rodrigo; Walder, Ingar; Mahoney, John J.

doi:10.1016/j.apgeochem.2018.09.002

Cited by 11 publications

(9 citation statements)

References 27 publications

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“…After the 12th leaching cycle, the pH of the leachate started to increase. The three columns operated at 10, 14, and 18°C showed pH levels similar to the column study of Embile et al (2018Embile et al ( , 2019 that was done at around 20°C.…”

Section: Sludge Compositionsupporting

confidence: 57%

“…In total, about 7 million tons of tailings were deposited at Ballangsleira deposit (Lu 2018). The tailings are mainly composed of mafic mineral (forsterite, orthopyroxene, amphibole, clinochlore) plagioclase, with minor to trace amounts of pyrrhotite and traces of chalcopyrite (Embile et al 2018(Embile et al , 2019. The tailings were covered with a thin soil layer of 10-20 cm to prevent the weathering and oxidation of the underlying tailings.…”

Section: Study Areamentioning

confidence: 99%

“…The tailings were covered with a thin soil layer of 10-20 cm to prevent the weathering and oxidation of the underlying tailings. However, the thin soil layer is not efficient in preventing the oxidation of the underlying tailings (Segalstad et al 2006;Embile et al 2018;Lu 2018). Leaching of metals such as Ni from the oxidation of tailings to the surrounding environment has been reported in a previous study (Embile et al 2018).…”

Section: Study Areamentioning

confidence: 99%

“…However, the thin soil layer is not efficient in preventing the oxidation of the underlying tailings (Segalstad et al 2006;Embile et al 2018;Lu 2018). Leaching of metals such as Ni from the oxidation of tailings to the surrounding environment has been reported in a previous study (Embile et al 2018). Therefore, Ballangsleira deposit was selected as the study area to investigate the leaching of contaminants from tailings and the efficiency of a cover made with digested sewage sludge from a local wastewater treatment plant in reducing the leaching of contaminants from tailings deposit.…”

Section: Study Areamentioning

confidence: 99%

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The effect of temperature and digested sewage sludge cover over tailings on the leaching of contaminants from Ballangen tailings deposit

Leiviskä

Walder

2021

Journal of Water and Climate Change

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Dry covers can be applied above tailings to reduce and prevent formation of acid mine drainage and leaching of contaminants. Efficiency of covers is affected by different parameters, of which temperature change under climate change context is one. Here, a laboratory column leaching experiment was performed under four temperatures, 5, 10, 14, and 18 °C on unoxidized tailings from Ballangen, Norway. 600 mL of water was added to each column every second week and leachate collected and analyzed for pH, salinity, alkalinity, concentrations of sulfate, Co, Fe, Mn, Ni, and Zn. A thin layer of digested sewage sludge was added to columns after the 16th leaching cycle. In total, 21 leaching cycles were performed. Results showed low oxidation of tailings and therefore high pH and low salinity, SO42−, Fe, Ni, and Co in the leachates at leaching temperature of 5 °C. Addition of sludge cover slowed down oxidation of underlying tailings and decreased leaching of SO42−, Fe, Mn, Co, Ni, and Zn from the tailings deposit, especially at relatively high temperature. 10 °C is a threshold temperature, below which leaching is not affected by the cover addition so much. At a leaching temperature higher than 10 °C, the sludge cover addition can reduce the leaching of elements significantly.

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Section: Sludge Compositionsupporting

confidence: 57%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

See 2 more Smart Citations

The effect of temperature and digested sewage sludge cover over tailings on the leaching of contaminants from Ballangen tailings deposit

Leiviskä

Walder

2021

Journal of Water and Climate Change

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“…In addition to pH, redox potential, and temperature of aqueous solutions, the grain size is an important factor that controls sulfide oxidation kinetics [7,63]. In general, fine-grained sulfides react faster than coarse-grained sulfides due to an exponential increase in their surface areas [64].…”

Section: Physicochemical Factors That Control the Oxidation Of Sulfidesmentioning

confidence: 99%

Stability of Cu-Sulfides in Submarine Tailing Disposals: A Case Study from Repparfjorden, Northern Norway

et al. 2020

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Mine tailings that were produced during the exploitation of the Ulveryggen siliciclastic sediment-hosted Cu deposit in northern Norway were disposed into the inner part of Repparfjorden from 1972 to 1978/1979. This study focuses on the mineralogy and geochemistry of the submarine mine tailings and underlying natural marine sediments from the inner part of Repparfjorden, as well as on the primary Ulveryggen ore. The ore mineralization from the neighboring Nussir carbonate sediment-hosted Cu deposit was studied too, due to the forthcoming mining of both deposits. Bornite and chalcopyrite are the major Cu-sulfides, and are characterized by low concentrations of potentially toxic elements including Cd, Hg, and As. The tailing material occupies the uppermost 9 cm of Repparfjorden sediments. It is characterized by predomination of a silty component with elevated Cu (up to 747.7 ppm), Ni (up to 87 ppm), and Cr (up to 417 ppm) concentrations. The high Cu concentration is related to the deposition of mine tailings. In contrast, Ni and Cr concentrations are close to those in naturally occurring stream sediments from the feeding river, Repparfjordelva, reflecting the compatibility of these elements with hosting mafic volcanics, which are widely spread in the Repparfjord Tectonic Window. Copper in the uppermost part of the sediments is bound to the acid-soluble fraction while Ni and Cr are bound to the residual fraction. Artificial placement of large masses of fine-grained material, i.e., smothering, resulted in a diminished biological activity and/or physical distortion of mostly benthic fauna, which was reflected in total organic carbon (TOC) values as low as 0.15% in the uppermost strata. Sulfide minerals are found both in natural marine sediments and in the mine tailings. They are generally well-preserved with an exception for chalcopyrite from the uppermost part of the submarine tailing, which shows signs of incipient weathering. Thermodynamic modeling confirmed that redox potential and pH are important factors in the weathering of sulfides. Available ligands contribute to the Cu speciation. In near-neutral to slightly alkaline conditions a presence of carbonates can lead to the mobilization of Cu in form of CuCO3 complexes.

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Investigation of the geochemical evolution of groundwater resources in the Zanjan plain, NW Iran

Hussainzadeh

Samani²,

Mahaqi

2023

Environ Earth Sci

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Forsterite and pyrrhotite dissolution rates in a tailings deposit obtained from column leaching experiments and inverse modeling: A novel method for a mine tailings sample

Cited by 11 publications

References 27 publications

The effect of temperature and digested sewage sludge cover over tailings on the leaching of contaminants from Ballangen tailings deposit

The effect of temperature and digested sewage sludge cover over tailings on the leaching of contaminants from Ballangen tailings deposit

Stability of Cu-Sulfides in Submarine Tailing Disposals: A Case Study from Repparfjorden, Northern Norway

Investigation of the geochemical evolution of groundwater resources in the Zanjan plain, NW Iran

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