Electrodialytic remediation of suspended mine tailings

Henrik K. Hansen, Adrian Rojo, Denisse Pino, Lisbeth M. Ottosen, Alexandra B. Ribeiro

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This work shows the laboratory results of nine electrodialytic remediation experiments on copper mine tailings. A newly designed remediation cell, where the solids were kept in suspension by airflow, was tested. The results show that electric current could remove copper from suspended tailings applying 40 mA during 7 days. The liquid-to-solid ratios used were 3, 6 and 9 mL g- 1. With addition of sulfuric acid, the process was enhanced because the pH decreased to either 2 or 4, and copper was therefore dissolved. The maximum copper removal was 80% with addition of sulfuric acid in 7-day experiment at 40 mA, with approximately 137.5 g mine tailings on dry basis. The removal for a static (baseline) experiment only amounted 15% when passing approximately the same amount of charge through 130 g of mine tailings. The use of air bubbling to keep the tailings suspended increased the removal efficiency from 1% to 80% compared to experiments with no stirring but with the same operational conditions. This showed the crucial importance of having the solids in suspension and not settled during the remediation.
Original languageEnglish
JournalJournal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering
Volume43
Issue number8
Pages (from-to)832-836
ISSN1093-4529
DOIs
Publication statusPublished - 2008

Cite this

@article{465feb8b5abc453285318c6676c070df,
title = "Electrodialytic remediation of suspended mine tailings",
abstract = "This work shows the laboratory results of nine electrodialytic remediation experiments on copper mine tailings. A newly designed remediation cell, where the solids were kept in suspension by airflow, was tested. The results show that electric current could remove copper from suspended tailings applying 40 mA during 7 days. The liquid-to-solid ratios used were 3, 6 and 9 mL g- 1. With addition of sulfuric acid, the process was enhanced because the pH decreased to either 2 or 4, and copper was therefore dissolved. The maximum copper removal was 80{\%} with addition of sulfuric acid in 7-day experiment at 40 mA, with approximately 137.5 g mine tailings on dry basis. The removal for a static (baseline) experiment only amounted 15{\%} when passing approximately the same amount of charge through 130 g of mine tailings. The use of air bubbling to keep the tailings suspended increased the removal efficiency from 1{\%} to 80{\%} compared to experiments with no stirring but with the same operational conditions. This showed the crucial importance of having the solids in suspension and not settled during the remediation.",
author = "Hansen, {Henrik K.} and Adrian Rojo and Denisse Pino and Ottosen, {Lisbeth M.} and Ribeiro, {Alexandra B.}",
year = "2008",
doi = "10.1080/10934520801974020",
language = "English",
volume = "43",
pages = "832--836",
journal = "Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering",
issn = "1093-4529",
publisher = "Taylor & Francis Inc.",
number = "8",

}

Electrodialytic remediation of suspended mine tailings. / Hansen, Henrik K.; Rojo, Adrian; Pino, Denisse; Ottosen, Lisbeth M.; Ribeiro, Alexandra B.

In: Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, Vol. 43, No. 8, 2008, p. 832-836.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Electrodialytic remediation of suspended mine tailings

AU - Hansen, Henrik K.

AU - Rojo, Adrian

AU - Pino, Denisse

AU - Ottosen, Lisbeth M.

AU - Ribeiro, Alexandra B.

PY - 2008

Y1 - 2008

N2 - This work shows the laboratory results of nine electrodialytic remediation experiments on copper mine tailings. A newly designed remediation cell, where the solids were kept in suspension by airflow, was tested. The results show that electric current could remove copper from suspended tailings applying 40 mA during 7 days. The liquid-to-solid ratios used were 3, 6 and 9 mL g- 1. With addition of sulfuric acid, the process was enhanced because the pH decreased to either 2 or 4, and copper was therefore dissolved. The maximum copper removal was 80% with addition of sulfuric acid in 7-day experiment at 40 mA, with approximately 137.5 g mine tailings on dry basis. The removal for a static (baseline) experiment only amounted 15% when passing approximately the same amount of charge through 130 g of mine tailings. The use of air bubbling to keep the tailings suspended increased the removal efficiency from 1% to 80% compared to experiments with no stirring but with the same operational conditions. This showed the crucial importance of having the solids in suspension and not settled during the remediation.

AB - This work shows the laboratory results of nine electrodialytic remediation experiments on copper mine tailings. A newly designed remediation cell, where the solids were kept in suspension by airflow, was tested. The results show that electric current could remove copper from suspended tailings applying 40 mA during 7 days. The liquid-to-solid ratios used were 3, 6 and 9 mL g- 1. With addition of sulfuric acid, the process was enhanced because the pH decreased to either 2 or 4, and copper was therefore dissolved. The maximum copper removal was 80% with addition of sulfuric acid in 7-day experiment at 40 mA, with approximately 137.5 g mine tailings on dry basis. The removal for a static (baseline) experiment only amounted 15% when passing approximately the same amount of charge through 130 g of mine tailings. The use of air bubbling to keep the tailings suspended increased the removal efficiency from 1% to 80% compared to experiments with no stirring but with the same operational conditions. This showed the crucial importance of having the solids in suspension and not settled during the remediation.

U2 - 10.1080/10934520801974020

DO - 10.1080/10934520801974020

M3 - Journal article

VL - 43

SP - 832

EP - 836

JO - Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering

JF - Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering

SN - 1093-4529

IS - 8

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