Spectroscopic analysis of the bioleaching of chalcopyrite by Acidithiobacillus caldus

Keiko Sasaki; Koichiro Takatsugi; Olli H. Tuovinen

doi:10.1016/j.hydromet.2012.07.013

Spectroscopic analysis of the bioleaching of chalcopyrite by Acidithiobacillus caldus

Keiko Sasaki, Koichiro Takatsugi, Olli H. Tuovinen

Earth Resources Engineering

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The formation and consumption of elemental S were investigated in the bioleaching of chalcopyrite within and without a CE dialysis membrane in Acidithiobacillus caldus cultures. The bacteria were supplemented with tetrathionate outside the membrane. XPS analysis showed that monosulfide species and elemental S were formed on CuFeS ₂ surface regardless of the enclosure in the dialysis membrane. They diminished over time in the inoculated systems. In the membrane enclosure, colloidal S partially dissolves and can pass the dialysis membrane for bacterial oxidation to sulfuric acid. Anaerobic pre-oxidation of CuFeS ₂ by Fe ^{3 +} produced S-rich deposition on mineral surface. The solubilization of Cu from membrane-enclosed pre-oxidized chalcopyrite in the A. caldus culture was much slower as compared to direct contact with bacteria. The difference is attributed to slow diffusion through the dialysis membrane as well as clogging caused by polymerized S on the inside of the membrane.

Original language	English
Pages (from-to)	116-120
Number of pages	5
Journal	Hydrometallurgy
Volume	127-128
DOIs	https://doi.org/10.1016/j.hydromet.2012.07.013
Publication status	Published - Oct 2012

All Science Journal Classification (ASJC) codes

Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.hydromet.2012.07.013

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title = "Spectroscopic analysis of the bioleaching of chalcopyrite by Acidithiobacillus caldus",

abstract = "The formation and consumption of elemental S were investigated in the bioleaching of chalcopyrite within and without a CE dialysis membrane in Acidithiobacillus caldus cultures. The bacteria were supplemented with tetrathionate outside the membrane. XPS analysis showed that monosulfide species and elemental S were formed on CuFeS 2 surface regardless of the enclosure in the dialysis membrane. They diminished over time in the inoculated systems. In the membrane enclosure, colloidal S partially dissolves and can pass the dialysis membrane for bacterial oxidation to sulfuric acid. Anaerobic pre-oxidation of CuFeS 2 by Fe 3 + produced S-rich deposition on mineral surface. The solubilization of Cu from membrane-enclosed pre-oxidized chalcopyrite in the A. caldus culture was much slower as compared to direct contact with bacteria. The difference is attributed to slow diffusion through the dialysis membrane as well as clogging caused by polymerized S on the inside of the membrane.",

author = "Keiko Sasaki and Koichiro Takatsugi and Tuovinen, {Olli H.}",

note = "Funding Information: Financial support was provided to KS by the Japan Society for the Promotion of Science (JSPS Grant-in-Aid for Scientific Research No. 22246117 ), the JSPS Funding Program for Next Generation World-Leading Researchers ( GR078 ) and JSPS Invitation Fellowship Program for Research in Japan (Short Term) FY2011 (S11078) . Raman spectroscopy and XPS measurements were performed at the Center of Advanced Instrumental Analysis, Kyushu University.",

year = "2012",

month = oct,

doi = "10.1016/j.hydromet.2012.07.013",

language = "English",

volume = "127-128",

pages = "116--120",

journal = "Hydrometallurgy",

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publisher = "Elsevier",

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AU - Sasaki, Keiko

AU - Takatsugi, Koichiro

AU - Tuovinen, Olli H.

N1 - Funding Information: Financial support was provided to KS by the Japan Society for the Promotion of Science (JSPS Grant-in-Aid for Scientific Research No. 22246117 ), the JSPS Funding Program for Next Generation World-Leading Researchers ( GR078 ) and JSPS Invitation Fellowship Program for Research in Japan (Short Term) FY2011 (S11078) . Raman spectroscopy and XPS measurements were performed at the Center of Advanced Instrumental Analysis, Kyushu University.

PY - 2012/10

Y1 - 2012/10

N2 - The formation and consumption of elemental S were investigated in the bioleaching of chalcopyrite within and without a CE dialysis membrane in Acidithiobacillus caldus cultures. The bacteria were supplemented with tetrathionate outside the membrane. XPS analysis showed that monosulfide species and elemental S were formed on CuFeS 2 surface regardless of the enclosure in the dialysis membrane. They diminished over time in the inoculated systems. In the membrane enclosure, colloidal S partially dissolves and can pass the dialysis membrane for bacterial oxidation to sulfuric acid. Anaerobic pre-oxidation of CuFeS 2 by Fe 3 + produced S-rich deposition on mineral surface. The solubilization of Cu from membrane-enclosed pre-oxidized chalcopyrite in the A. caldus culture was much slower as compared to direct contact with bacteria. The difference is attributed to slow diffusion through the dialysis membrane as well as clogging caused by polymerized S on the inside of the membrane.

AB - The formation and consumption of elemental S were investigated in the bioleaching of chalcopyrite within and without a CE dialysis membrane in Acidithiobacillus caldus cultures. The bacteria were supplemented with tetrathionate outside the membrane. XPS analysis showed that monosulfide species and elemental S were formed on CuFeS 2 surface regardless of the enclosure in the dialysis membrane. They diminished over time in the inoculated systems. In the membrane enclosure, colloidal S partially dissolves and can pass the dialysis membrane for bacterial oxidation to sulfuric acid. Anaerobic pre-oxidation of CuFeS 2 by Fe 3 + produced S-rich deposition on mineral surface. The solubilization of Cu from membrane-enclosed pre-oxidized chalcopyrite in the A. caldus culture was much slower as compared to direct contact with bacteria. The difference is attributed to slow diffusion through the dialysis membrane as well as clogging caused by polymerized S on the inside of the membrane.

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JO - Hydrometallurgy

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Spectroscopic analysis of the bioleaching of chalcopyrite by Acidithiobacillus caldus

Abstract

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