The influence of Magnafloc10 on the acidic, alkaline, and electrodialytic desorption of metals from mine tailings

Kristine B. Pedersen*, Helena C. Reinardy, Pernille Erland Jensen, Lisbeth M. Ottosen, Juho Junttila, Marianne Frantzen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Repparfjorden in northern Norway has been partly designated for submarine mine tailings disposal when the adjacent Cu mine re-opens in 2019. In order to increase sedimentation, the flocculant, Magnafloc10 is planned to be added to the mine tailings prior to discharge into the fjord. This study investigated the feasibility of reducing the Cu concentrations (375 mg/kg) in the mine tailings by applying electrodialytic extraction, including potential optimisation by adding Magnafloc10. In the acidic electrodialytic treatment (pH < 2), Magnafloc10 increased the extraction of Cu from the mine tailings particles from 76 to 86%, and the flocs with adsorbed metals were separated from the tailings solids by the electric field (1 mA/cm2). The electric energy consumption increased with the use of Magnafloc10 (from 17 to 30 kWh/g Cu extracted), due to lower conductivity in the liquid phase and clogging of the membrane by the flocs. In the alkaline electrodialytic treatment (pH > 12), Magnafloc10 reduced the extraction of Cu from 17% to 0.7%, due to the flocs remaining in the tailing slurries. The electric energy consumption per extracted Cu was similar in the acidic and alkaline electrodialytic treatments without the addition of Magnafloc10. In the alkaline electrodialytic treatment, the extraction of other metals was low (<2%), however longer treatment time is necessary to achieve similar Cu extraction as in the acidic electrodialysis. Depending on the target and timescale for treatment, acidic and alkaline electrodialysis can be employed to reduce the Cu concentration in the mine tailings thereby reducing the metal toxicity potential.
Original languageEnglish
JournalJournal of Environmental Management
Volume224
Pages (from-to)130-139
Number of pages10
ISSN0301-4797
DOIs
Publication statusPublished - 2018

Keywords

  • Electrokinetic remediation
  • Copper
  • Magnafloc10
  • Sequential extraction
  • Metal extraction
  • Mine tailings

Cite this

@article{72ca2c4f0ed34b27addd92f5def33cda,
title = "The influence of Magnafloc10 on the acidic, alkaline, and electrodialytic desorption of metals from mine tailings",
abstract = "Repparfjorden in northern Norway has been partly designated for submarine mine tailings disposal when the adjacent Cu mine re-opens in 2019. In order to increase sedimentation, the flocculant, Magnafloc10 is planned to be added to the mine tailings prior to discharge into the fjord. This study investigated the feasibility of reducing the Cu concentrations (375 mg/kg) in the mine tailings by applying electrodialytic extraction, including potential optimisation by adding Magnafloc10. In the acidic electrodialytic treatment (pH < 2), Magnafloc10 increased the extraction of Cu from the mine tailings particles from 76 to 86{\%}, and the flocs with adsorbed metals were separated from the tailings solids by the electric field (1 mA/cm2). The electric energy consumption increased with the use of Magnafloc10 (from 17 to 30 kWh/g Cu extracted), due to lower conductivity in the liquid phase and clogging of the membrane by the flocs. In the alkaline electrodialytic treatment (pH > 12), Magnafloc10 reduced the extraction of Cu from 17{\%} to 0.7{\%}, due to the flocs remaining in the tailing slurries. The electric energy consumption per extracted Cu was similar in the acidic and alkaline electrodialytic treatments without the addition of Magnafloc10. In the alkaline electrodialytic treatment, the extraction of other metals was low (<2{\%}), however longer treatment time is necessary to achieve similar Cu extraction as in the acidic electrodialysis. Depending on the target and timescale for treatment, acidic and alkaline electrodialysis can be employed to reduce the Cu concentration in the mine tailings thereby reducing the metal toxicity potential.",
keywords = "Electrokinetic remediation, Copper, Magnafloc10, Sequential extraction, Metal extraction, Mine tailings",
author = "Pedersen, {Kristine B.} and Reinardy, {Helena C.} and Jensen, {Pernille Erland} and Ottosen, {Lisbeth M.} and Juho Junttila and Marianne Frantzen",
year = "2018",
doi = "10.1016/j.jenvman.2018.07.050",
language = "English",
volume = "224",
pages = "130--139",
journal = "Journal of Environmental Management",
issn = "0301-4797",
publisher = "Academic Press",

}

The influence of Magnafloc10 on the acidic, alkaline, and electrodialytic desorption of metals from mine tailings. / Pedersen, Kristine B.; Reinardy, Helena C.; Jensen, Pernille Erland; Ottosen, Lisbeth M.; Junttila, Juho; Frantzen, Marianne.

In: Journal of Environmental Management, Vol. 224, 2018, p. 130-139.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The influence of Magnafloc10 on the acidic, alkaline, and electrodialytic desorption of metals from mine tailings

AU - Pedersen, Kristine B.

AU - Reinardy, Helena C.

AU - Jensen, Pernille Erland

AU - Ottosen, Lisbeth M.

AU - Junttila, Juho

AU - Frantzen, Marianne

PY - 2018

Y1 - 2018

N2 - Repparfjorden in northern Norway has been partly designated for submarine mine tailings disposal when the adjacent Cu mine re-opens in 2019. In order to increase sedimentation, the flocculant, Magnafloc10 is planned to be added to the mine tailings prior to discharge into the fjord. This study investigated the feasibility of reducing the Cu concentrations (375 mg/kg) in the mine tailings by applying electrodialytic extraction, including potential optimisation by adding Magnafloc10. In the acidic electrodialytic treatment (pH < 2), Magnafloc10 increased the extraction of Cu from the mine tailings particles from 76 to 86%, and the flocs with adsorbed metals were separated from the tailings solids by the electric field (1 mA/cm2). The electric energy consumption increased with the use of Magnafloc10 (from 17 to 30 kWh/g Cu extracted), due to lower conductivity in the liquid phase and clogging of the membrane by the flocs. In the alkaline electrodialytic treatment (pH > 12), Magnafloc10 reduced the extraction of Cu from 17% to 0.7%, due to the flocs remaining in the tailing slurries. The electric energy consumption per extracted Cu was similar in the acidic and alkaline electrodialytic treatments without the addition of Magnafloc10. In the alkaline electrodialytic treatment, the extraction of other metals was low (<2%), however longer treatment time is necessary to achieve similar Cu extraction as in the acidic electrodialysis. Depending on the target and timescale for treatment, acidic and alkaline electrodialysis can be employed to reduce the Cu concentration in the mine tailings thereby reducing the metal toxicity potential.

AB - Repparfjorden in northern Norway has been partly designated for submarine mine tailings disposal when the adjacent Cu mine re-opens in 2019. In order to increase sedimentation, the flocculant, Magnafloc10 is planned to be added to the mine tailings prior to discharge into the fjord. This study investigated the feasibility of reducing the Cu concentrations (375 mg/kg) in the mine tailings by applying electrodialytic extraction, including potential optimisation by adding Magnafloc10. In the acidic electrodialytic treatment (pH < 2), Magnafloc10 increased the extraction of Cu from the mine tailings particles from 76 to 86%, and the flocs with adsorbed metals were separated from the tailings solids by the electric field (1 mA/cm2). The electric energy consumption increased with the use of Magnafloc10 (from 17 to 30 kWh/g Cu extracted), due to lower conductivity in the liquid phase and clogging of the membrane by the flocs. In the alkaline electrodialytic treatment (pH > 12), Magnafloc10 reduced the extraction of Cu from 17% to 0.7%, due to the flocs remaining in the tailing slurries. The electric energy consumption per extracted Cu was similar in the acidic and alkaline electrodialytic treatments without the addition of Magnafloc10. In the alkaline electrodialytic treatment, the extraction of other metals was low (<2%), however longer treatment time is necessary to achieve similar Cu extraction as in the acidic electrodialysis. Depending on the target and timescale for treatment, acidic and alkaline electrodialysis can be employed to reduce the Cu concentration in the mine tailings thereby reducing the metal toxicity potential.

KW - Electrokinetic remediation

KW - Copper

KW - Magnafloc10

KW - Sequential extraction

KW - Metal extraction

KW - Mine tailings

U2 - 10.1016/j.jenvman.2018.07.050

DO - 10.1016/j.jenvman.2018.07.050

M3 - Journal article

VL - 224

SP - 130

EP - 139

JO - Journal of Environmental Management

JF - Journal of Environmental Management

SN - 0301-4797

ER -