Pilot-Scale Bioleaching of Metals from Pyritic Ashes

Elina A. Vuorenmaa, Jarno Mäkinen, Tero Korhonen, Raisa Neitola, Anna H. Kaksonen (Corresponding author)

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Solid waste from sulfuric acid production may contain relatively high levels of metals such as Fe, Zn, Co, Cu and As that are harmful if inappropriately disposed of in the environment, but may be a valuable resource if metals can be recovered. The objective of this research was to investigate the pilot-scale acid bioleaching of metals from pyritic ashes, originating from the roasting of pyrite ores for sulfuric acid production and consisting mainly of hematite. Bioleaching was carried out at 25 °C in pilot-scale continuously stirred tank reactors (CSTR), with 50 L working volume in mineral salts medium supplemented with trace elements, 1 % (w/v) elemental sulfur and with pyritic ash pulp densities 10 % and 20 %. The reactors were inoculated with a mixed culture of iron- and sulfur-oxidising acidophiles containing Acidithiobacillus (At.) ferrooxidans, At. thiooxidans/albertensis, At. caldus, Leptospirillum ferrooxidans, Sulfobacillus (Sb.) thermosulfidooxidans, Sb. thermotolerans and some members of Alicyclobacillus genus. Metal leaching yields from pyritic ashes in the CSTR after 32 days were 54.6-56.7 % Cu, 41.7-43.2 % Zn, 1.7-1.8 % Co, 3.0-5.4 % As and 0.3-0.5 % Fe. Solution pH decreased during the experiment from 2.9 to 1.9-2.2. Elemental analysis using X-ray fluorescence showed that the contents of metals, except for As, in the leach residue were below the higher guideline values given in the Government decree on the assessment of the soil contamination and remediation needs by the Ministry of the Environment, Finland. Bioleaching facilitated the extraction of metals from pyritic ashes and the mitigation of environmental risks related to the residue disposal for other metals except for As.

Original languageEnglish
Title of host publication22nd International Biohydrometallurgy Symposium
EditorsSabrina Hedrich, Kathrin Rübberdt, Franz Glombitza, Wolfgang Sand, Axel Schippers, Mario Vera Véliz, Sabine Willscher
Pages147-150
Number of pages4
DOIs
Publication statusPublished - 1 Jan 2017
MoE publication typeA4 Article in a conference publication

Fingerprint

Ashes
Bioleaching
ashes
Metals
metals
reactors
sulfuric acid
Sulfuric acid
Sulfur
sulfur
soil pollution
minerals
solid wastes
Finland
Pyrites
Hematite
disposal
Trace Elements
Solid wastes
pyrites

Keywords

  • Acidophile
  • Bioleaching
  • Contaminant
  • Metals
  • Pyritic ash
  • Waste

Cite this

Vuorenmaa, E. A., Mäkinen, J., Korhonen, T., Neitola, R., & Kaksonen, A. H. (2017). Pilot-Scale Bioleaching of Metals from Pyritic Ashes. In S. Hedrich, K. Rübberdt, F. Glombitza, W. Sand, A. Schippers, M. V. Véliz, & S. Willscher (Eds.), 22nd International Biohydrometallurgy Symposium (pp. 147-150). Solid State Phenomena, Vol.. 262 https://doi.org/10.4028/www.scientific.net/SSP.262.147
Vuorenmaa, Elina A. ; Mäkinen, Jarno ; Korhonen, Tero ; Neitola, Raisa ; Kaksonen, Anna H. / Pilot-Scale Bioleaching of Metals from Pyritic Ashes. 22nd International Biohydrometallurgy Symposium. editor / Sabrina Hedrich ; Kathrin Rübberdt ; Franz Glombitza ; Wolfgang Sand ; Axel Schippers ; Mario Vera Véliz ; Sabine Willscher. 2017. pp. 147-150 (Solid State Phenomena, Vol. 262).
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title = "Pilot-Scale Bioleaching of Metals from Pyritic Ashes",
abstract = "Solid waste from sulfuric acid production may contain relatively high levels of metals such as Fe, Zn, Co, Cu and As that are harmful if inappropriately disposed of in the environment, but may be a valuable resource if metals can be recovered. The objective of this research was to investigate the pilot-scale acid bioleaching of metals from pyritic ashes, originating from the roasting of pyrite ores for sulfuric acid production and consisting mainly of hematite. Bioleaching was carried out at 25 °C in pilot-scale continuously stirred tank reactors (CSTR), with 50 L working volume in mineral salts medium supplemented with trace elements, 1 {\%} (w/v) elemental sulfur and with pyritic ash pulp densities 10 {\%} and 20 {\%}. The reactors were inoculated with a mixed culture of iron- and sulfur-oxidising acidophiles containing Acidithiobacillus (At.) ferrooxidans, At. thiooxidans/albertensis, At. caldus, Leptospirillum ferrooxidans, Sulfobacillus (Sb.) thermosulfidooxidans, Sb. thermotolerans and some members of Alicyclobacillus genus. Metal leaching yields from pyritic ashes in the CSTR after 32 days were 54.6-56.7 {\%} Cu, 41.7-43.2 {\%} Zn, 1.7-1.8 {\%} Co, 3.0-5.4 {\%} As and 0.3-0.5 {\%} Fe. Solution pH decreased during the experiment from 2.9 to 1.9-2.2. Elemental analysis using X-ray fluorescence showed that the contents of metals, except for As, in the leach residue were below the higher guideline values given in the Government decree on the assessment of the soil contamination and remediation needs by the Ministry of the Environment, Finland. Bioleaching facilitated the extraction of metals from pyritic ashes and the mitigation of environmental risks related to the residue disposal for other metals except for As.",
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Vuorenmaa, EA, Mäkinen, J, Korhonen, T, Neitola, R & Kaksonen, AH 2017, Pilot-Scale Bioleaching of Metals from Pyritic Ashes. in S Hedrich, K Rübberdt, F Glombitza, W Sand, A Schippers, MV Véliz & S Willscher (eds), 22nd International Biohydrometallurgy Symposium. Solid State Phenomena, vol. 262, pp. 147-150. https://doi.org/10.4028/www.scientific.net/SSP.262.147

Pilot-Scale Bioleaching of Metals from Pyritic Ashes. / Vuorenmaa, Elina A.; Mäkinen, Jarno; Korhonen, Tero; Neitola, Raisa; Kaksonen, Anna H. (Corresponding author).

22nd International Biohydrometallurgy Symposium. ed. / Sabrina Hedrich; Kathrin Rübberdt; Franz Glombitza; Wolfgang Sand; Axel Schippers; Mario Vera Véliz; Sabine Willscher. 2017. p. 147-150 (Solid State Phenomena, Vol. 262).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AU - Neitola, Raisa

AU - Kaksonen, Anna H.

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N2 - Solid waste from sulfuric acid production may contain relatively high levels of metals such as Fe, Zn, Co, Cu and As that are harmful if inappropriately disposed of in the environment, but may be a valuable resource if metals can be recovered. The objective of this research was to investigate the pilot-scale acid bioleaching of metals from pyritic ashes, originating from the roasting of pyrite ores for sulfuric acid production and consisting mainly of hematite. Bioleaching was carried out at 25 °C in pilot-scale continuously stirred tank reactors (CSTR), with 50 L working volume in mineral salts medium supplemented with trace elements, 1 % (w/v) elemental sulfur and with pyritic ash pulp densities 10 % and 20 %. The reactors were inoculated with a mixed culture of iron- and sulfur-oxidising acidophiles containing Acidithiobacillus (At.) ferrooxidans, At. thiooxidans/albertensis, At. caldus, Leptospirillum ferrooxidans, Sulfobacillus (Sb.) thermosulfidooxidans, Sb. thermotolerans and some members of Alicyclobacillus genus. Metal leaching yields from pyritic ashes in the CSTR after 32 days were 54.6-56.7 % Cu, 41.7-43.2 % Zn, 1.7-1.8 % Co, 3.0-5.4 % As and 0.3-0.5 % Fe. Solution pH decreased during the experiment from 2.9 to 1.9-2.2. Elemental analysis using X-ray fluorescence showed that the contents of metals, except for As, in the leach residue were below the higher guideline values given in the Government decree on the assessment of the soil contamination and remediation needs by the Ministry of the Environment, Finland. Bioleaching facilitated the extraction of metals from pyritic ashes and the mitigation of environmental risks related to the residue disposal for other metals except for As.

AB - Solid waste from sulfuric acid production may contain relatively high levels of metals such as Fe, Zn, Co, Cu and As that are harmful if inappropriately disposed of in the environment, but may be a valuable resource if metals can be recovered. The objective of this research was to investigate the pilot-scale acid bioleaching of metals from pyritic ashes, originating from the roasting of pyrite ores for sulfuric acid production and consisting mainly of hematite. Bioleaching was carried out at 25 °C in pilot-scale continuously stirred tank reactors (CSTR), with 50 L working volume in mineral salts medium supplemented with trace elements, 1 % (w/v) elemental sulfur and with pyritic ash pulp densities 10 % and 20 %. The reactors were inoculated with a mixed culture of iron- and sulfur-oxidising acidophiles containing Acidithiobacillus (At.) ferrooxidans, At. thiooxidans/albertensis, At. caldus, Leptospirillum ferrooxidans, Sulfobacillus (Sb.) thermosulfidooxidans, Sb. thermotolerans and some members of Alicyclobacillus genus. Metal leaching yields from pyritic ashes in the CSTR after 32 days were 54.6-56.7 % Cu, 41.7-43.2 % Zn, 1.7-1.8 % Co, 3.0-5.4 % As and 0.3-0.5 % Fe. Solution pH decreased during the experiment from 2.9 to 1.9-2.2. Elemental analysis using X-ray fluorescence showed that the contents of metals, except for As, in the leach residue were below the higher guideline values given in the Government decree on the assessment of the soil contamination and remediation needs by the Ministry of the Environment, Finland. Bioleaching facilitated the extraction of metals from pyritic ashes and the mitigation of environmental risks related to the residue disposal for other metals except for As.

KW - Acidophile

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EP - 150

BT - 22nd International Biohydrometallurgy Symposium

A2 - Hedrich, Sabrina

A2 - Rübberdt, Kathrin

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A2 - Sand, Wolfgang

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A2 - Véliz, Mario Vera

A2 - Willscher, Sabine

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Vuorenmaa EA, Mäkinen J, Korhonen T, Neitola R, Kaksonen AH. Pilot-Scale Bioleaching of Metals from Pyritic Ashes. In Hedrich S, Rübberdt K, Glombitza F, Sand W, Schippers A, Véliz MV, Willscher S, editors, 22nd International Biohydrometallurgy Symposium. 2017. p. 147-150. (Solid State Phenomena, Vol. 262). https://doi.org/10.4028/www.scientific.net/SSP.262.147