Bioleaching and recovery of metals from final slag waste of the copper smelting industry

Anna H. Kaksonen (Corresponding Author), Leena Lavonen, Mari Kuusenaho, Anni Kolli, Heli Närhi, Elina Vestola, Jaakko A. Puhakka, Olli H. Tuovinen

Research output: Contribution to journalArticleScientificpeer-review

43 Citations (Scopus)

Abstract

Solid waste from the copper smelting industry may be harmful if disposed of in the environment, but it may be a valuable resource if metals can be recovered. The purpose of this study was to evaluate the acid bioleaching of metals from a sample of final smelter slag and the recovery of metals from the leach liquors. Bioleaching was tested in a continuously stirred tank reactor (CSTR) at 20–25 °C with 5% pulp density (particle size 75% <47 μm). The yields of metal solubilization after 29 days of contact were 41% Fe, 62% Cu, 35% Zn and 44% Ni. Metals were precipitated in a separate CSTR by titrating the leach liquors with sulfide-rich effluent from a sulfate-reducing fluidized-bed reactor (FBR) (25 °C) to desired pH values. Over 98% of the Cu precipitated at pH ⩾ 2.8 and over 99% of the Zn precipitated at pH ⩾ 3.9. The precipitation of Ni and Fe required higher pH values and was less efficient than Cu and Zn recovery. In addition, bulk precipitation of metals was also tested by feeding the leach liquor directly to another sulfate-reducing FBR. In order to reduce its toxicity and maintain stable sulfate reduction performance in the FBR, the leach liquor had to be diluted ten-fold and the pH adjusted from 0.6 to approximately 4.
Original languageEnglish
Pages (from-to)1113-1121
JournalMinerals Engineering
Volume24
Issue number11
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

Copper smelting
Bioleaching
smelting
slag
Slags
Metals
copper
Recovery
industry
metal
Fluidized beds
Sulfates
Industry
sulfate
Sulfides
solubilization
Solid wastes
solid waste
Pulp
Toxicity

Keywords

  • Bacteria
  • Bioleaching
  • Biotechnology
  • Waste processing

Cite this

Kaksonen, A. H., Lavonen, L., Kuusenaho, M., Kolli, A., Närhi, H., Vestola, E., ... Tuovinen, O. H. (2011). Bioleaching and recovery of metals from final slag waste of the copper smelting industry. Minerals Engineering, 24(11), 1113-1121. https://doi.org/10.1016/j.mineng.2011.02.011
Kaksonen, Anna H. ; Lavonen, Leena ; Kuusenaho, Mari ; Kolli, Anni ; Närhi, Heli ; Vestola, Elina ; Puhakka, Jaakko A. ; Tuovinen, Olli H. / Bioleaching and recovery of metals from final slag waste of the copper smelting industry. In: Minerals Engineering. 2011 ; Vol. 24, No. 11. pp. 1113-1121.
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Kaksonen, AH, Lavonen, L, Kuusenaho, M, Kolli, A, Närhi, H, Vestola, E, Puhakka, JA & Tuovinen, OH 2011, 'Bioleaching and recovery of metals from final slag waste of the copper smelting industry', Minerals Engineering, vol. 24, no. 11, pp. 1113-1121. https://doi.org/10.1016/j.mineng.2011.02.011

Bioleaching and recovery of metals from final slag waste of the copper smelting industry. / Kaksonen, Anna H. (Corresponding Author); Lavonen, Leena; Kuusenaho, Mari; Kolli, Anni; Närhi, Heli; Vestola, Elina; Puhakka, Jaakko A.; Tuovinen, Olli H.

In: Minerals Engineering, Vol. 24, No. 11, 2011, p. 1113-1121.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Bioleaching and recovery of metals from final slag waste of the copper smelting industry

AU - Kaksonen, Anna H.

AU - Lavonen, Leena

AU - Kuusenaho, Mari

AU - Kolli, Anni

AU - Närhi, Heli

AU - Vestola, Elina

AU - Puhakka, Jaakko A.

AU - Tuovinen, Olli H.

PY - 2011

Y1 - 2011

N2 - Solid waste from the copper smelting industry may be harmful if disposed of in the environment, but it may be a valuable resource if metals can be recovered. The purpose of this study was to evaluate the acid bioleaching of metals from a sample of final smelter slag and the recovery of metals from the leach liquors. Bioleaching was tested in a continuously stirred tank reactor (CSTR) at 20–25 °C with 5% pulp density (particle size 75% <47 μm). The yields of metal solubilization after 29 days of contact were 41% Fe, 62% Cu, 35% Zn and 44% Ni. Metals were precipitated in a separate CSTR by titrating the leach liquors with sulfide-rich effluent from a sulfate-reducing fluidized-bed reactor (FBR) (25 °C) to desired pH values. Over 98% of the Cu precipitated at pH ⩾ 2.8 and over 99% of the Zn precipitated at pH ⩾ 3.9. The precipitation of Ni and Fe required higher pH values and was less efficient than Cu and Zn recovery. In addition, bulk precipitation of metals was also tested by feeding the leach liquor directly to another sulfate-reducing FBR. In order to reduce its toxicity and maintain stable sulfate reduction performance in the FBR, the leach liquor had to be diluted ten-fold and the pH adjusted from 0.6 to approximately 4.

AB - Solid waste from the copper smelting industry may be harmful if disposed of in the environment, but it may be a valuable resource if metals can be recovered. The purpose of this study was to evaluate the acid bioleaching of metals from a sample of final smelter slag and the recovery of metals from the leach liquors. Bioleaching was tested in a continuously stirred tank reactor (CSTR) at 20–25 °C with 5% pulp density (particle size 75% <47 μm). The yields of metal solubilization after 29 days of contact were 41% Fe, 62% Cu, 35% Zn and 44% Ni. Metals were precipitated in a separate CSTR by titrating the leach liquors with sulfide-rich effluent from a sulfate-reducing fluidized-bed reactor (FBR) (25 °C) to desired pH values. Over 98% of the Cu precipitated at pH ⩾ 2.8 and over 99% of the Zn precipitated at pH ⩾ 3.9. The precipitation of Ni and Fe required higher pH values and was less efficient than Cu and Zn recovery. In addition, bulk precipitation of metals was also tested by feeding the leach liquor directly to another sulfate-reducing FBR. In order to reduce its toxicity and maintain stable sulfate reduction performance in the FBR, the leach liquor had to be diluted ten-fold and the pH adjusted from 0.6 to approximately 4.

KW - Bacteria

KW - Bioleaching

KW - Biotechnology

KW - Waste processing

U2 - 10.1016/j.mineng.2011.02.011

DO - 10.1016/j.mineng.2011.02.011

M3 - Article

VL - 24

SP - 1113

EP - 1121

JO - Minerals Engineering

JF - Minerals Engineering

SN - 0892-6875

IS - 11

ER -