Searching for Useful Bacteria on Chalcopyrite Leaching from Japanese Abandoned Mines

Joe, Seong Jin; Sakoda, Masatoshi; Chida, Tadashi; Kida, Yoshiharu; Nakamura, Hidekatsu; Tamura, Muneyuki

doi:10.4028/www.scientific.net/AMR.20-21.557

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Bacterial Activity at Low Temperature in Cultures Derived from a Low-Grade Copper Sulphide Bioleaching Heap at the Escondida Mine, Chile
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Isolation and Molecular Characterization of Sulfate Reducing Bacteria in a Brazilian Acid Mine Drainage
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C-di-GMP Pathway in Acidithiobacillus ferrooxidans: Analysis of Putative Diguanylate Cyclases (DGCs) and Phosphodiesterases (PDEs) Bifunctional Proteins
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Searching for Useful Bacteria on Chalcopyrite Leaching from Japanese Abandoned Mines
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Comparative Bioreduction of Fe(III) with Geobacter metallireducens and Bacillus infernus
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The Use of CARD-FISH to Evaluate the Quantitative Microbial Ecology Involved in the Continuous Bioleaching of a Cobaltiferrous Pyrite
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The Effect of Multiple Stresses on Sulfolobus-like Cultures in Bioleaching Systems: Super-Imposing Stress Responses to Metal Concentration and Solids Loading
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A New Acid-Stable, Fe-Oxidizing/O₂-Reducing Supercomplex Spanning Both Inner and Outer Membranes, Isolated from the Extremophile Acidithiobacillus
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Home Advanced Materials Research Biohydrometallurgy: From the Single Cell to the...Searching for Useful Bacteria on Chalcopyrite...

Searching for Useful Bacteria on Chalcopyrite Leaching from Japanese Abandoned Mines

Abstract:

Bioleaching studies have been conducted to obtain bacteria having a high ability to dissolve copper from chalcopyrite. For these studies, samples of mine drainage water which contain high concentrations of copper or iron ions in several abandoned mines in Japan were used to inoculate enrichment cultures on 0.16 M ferrous iron in the absence of chalcopyrite concentrate. Afterwards, these were accumulated and supplied to shaking-flask bioleaching tests on chalcopyrite concentrate. Copper dissolution rates were measured in chalcopyrite leaching experiments and compared with those using cell-free ferrous/ferric media. The copper dissolution rate in ferrous sulphate medium was higher than that in ferric sulphate medium. Moreover, tests in the presence of bacteria showed even an higher copper dissolution rate.

Info:

Periodical:

Advanced Materials Research (Volumes 20-21)

Main Theme:

Biohydrometallurgy: From the Single Cell to the Environment

Edited by:

Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher

Pages:

557-560

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.557

Citation:

S. J. Joe et al., "Searching for Useful Bacteria on Chalcopyrite Leaching from Japanese Abandoned Mines", Advanced Materials Research, Vols. 20-21, pp. 557-560, 2007

Online since:

July 2007

Authors:

Seong Jin Joe, Masatoshi Sakoda, Tadashi Chida, Yoshiharu Kida, Hidekatsu Nakamura, Muneyuki Tamura

Keywords:

Abandoned Mines, Chalcopyrite Concentrate, Leaching

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References

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Paper TitlePages

Effect of Sulfuric Acid Concentration on Chalcopyrite Concentrate Chemical Leaching

Authors: Seong Jin Joe, Tadashi Chida, Masatoshi Sakoda, Hidekatsu Nakamura, Muneyuki Tamura, N. Sato

Abstract: This study reports the effect of sulfuric acid concentration on chalcopyrite chemical leaching in very simple H2SO4 solution systems ranging from 23g/L to 30g/L, with 2.5% chalcopyrite concentrate at 30°C. Copper extraction from chalcopyrite increases with an increase in sulfuric acid concentration, e.g. 86%, 90% and 92% after 96 days at 23g/L, 25/L and 27g/L H2SO4 solution respectively. Sulfur element formed on the surface of chalcopyrite was very porous as the result of an electron probe microanalyzer (EPMA). Copper extraction, however, leveled out at 35% after 20 days when the sulfuric acid concentration was higher than 28g/L on 25g/L of chalcopyrite concentrate. Sulfur element was detected by X-ray analysis as only a leaching reaction product. The passivation may be caused by thick elemental surface formed on the surface of chalcopyrite.

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The Effect of Silver Ion Catalysis on Bioleaching of Chalcopyrite Tailings

Authors: Jin Liu, Dong Wei Li, Shao Jian Zhang, Dou Li, Lin Yu

Abstract: The bioleaching effect of different concentrations of silver ion catalysis on chalcopyrite tailings has been investigated in shaking flasks. In this paper, A.t ferrooxidans were selected for conducting the bioleaching process. Experiments were carried out under the condition of pulp density 150 g/L, inoculation amount 106~7 cells/mL, pH around 2.0, culture temperature 30°C, rotation speed 150 r/min. The silver ion concentrations varied from 0 to 0.05g/L. After a bioleaching time of 24 days, 82% and 55% of copper was dissolved from the ore for the silver ion concentration of 0.01 g/L and 0.001 g/L respectively, compared with only 37% and 13% recovery for the silver ion concentration of 0 and 0.05 g/L. Preliminary tests showed that the silver ion concentration had a markedly catalytic effect on the copper extraction. The experimental results also showed that high silver ion concentration would inhibit the copper extraction. That was because the silver ions at high concentrations are toxic and they can suppress the bacteria growth and oxidation activity.

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