Leaching behavior and its mechanism in the leaching of a chalcopyrite concentrate by Thiobacillus ferrooxidans.

The bacterial oxidation of a naturally occurring gallium-bearing chalcopyrite concentrate and a pure synthetic gallium (III) sulfide has been investigated at pH 1.8 and 35 °C, using an active culture of Thiobacillus ferrooxidans. This oxidation process may proceed by direct or by indirect bacterial action. The highest dissolved gallium and copper concentrations were about 2.2 and 40.2 g/ℓ respectively. The order of the specific rate of oxygen uptake by T. ferrooxidans is approximately CuFeS2[Formula: see text] gallium-bearing CuFeS2 > FeS2 > CuS > Cu2S > Ga2S3.

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Microbiological leaching of a chalcopyrite concentrate and the influence of hydrostatic pressure on the activity of Thiobacillus ferrooxidans

European Journal of Applied Microbiology and Biotechnology ◽

10.1007/bf00522482 ◽

1979 ◽

Vol 7 (1) ◽

pp. 85-90 ◽

Cited By ~ 4

Author(s):

Klaus Bosecker ◽

Arpad E. Torma ◽

James A. Brierley

Keyword(s):

Hydrostatic Pressure ◽

Thiobacillus Ferrooxidans ◽

Chalcopyrite Concentrate

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Leaching Behavior and Surface Characterization of Pyrite in Bacterial Leaching with Thiobacillus ferrooxidans.

Shigen-to-Sozai ◽

10.2473/shigentosozai.109.29 ◽

1993 ◽

Vol 109 (1) ◽

pp. 29-35 ◽

Cited By ~ 3

Author(s):

Keiko SASAKI ◽

Masami TSUNEKAWA ◽

Hidetaka KONNO ◽

Tsuyoshi HIRAJIMA ◽

Takakatsu TAKAMORI

Keyword(s):

Surface Characterization ◽

Thiobacillus Ferrooxidans ◽

Leaching Behavior ◽

Bacterial Leaching

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Biochemical and chemical events in copper solubilization from a chalcopyrite concentrate by Thiobacillus ferrooxidans in batch culture

International Journal of Mineral Processing ◽

10.1016/0301-7516(89)90049-5 ◽

1989 ◽

Vol 26 (1-2) ◽

pp. 153-162 ◽

Cited By ~ 5

Author(s):

L. Toro ◽

S. Di Cesare ◽

B. Paponetti ◽

A. Lepidi

Keyword(s):

Batch Culture ◽

Thiobacillus Ferrooxidans ◽

Chalcopyrite Concentrate ◽

Chemical Events

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Scanning Electron Microscope Study of Bacteria on Mineral Surfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100090634 ◽

1976 ◽

Vol 34 ◽

pp. 130-131

Author(s):

V.K. Berry

Keyword(s):

Oxidation Reaction ◽

Electron Microscope Study ◽

Elemental Sulfur ◽

Thiobacillus Ferrooxidans ◽

Physical Contact ◽

Metal Sulfides ◽

Low Grade ◽

Mineral Surfaces ◽

Mineral Surface ◽

Scanning Electron Microscope Study

There are two strains of bacteria viz. Thiobacillus thiooxidansand Thiobacillus ferrooxidanswidely mentioned to play an important role in the leaching process of low-grade ores. Another strain used in this study is a thermophile and is designated Caldariella .These microorganisms are acidophilic chemosynthetic aerobic autotrophs and are capable of oxidizing many metal sulfides and elemental sulfur to sulfates and Fe2+ to Fe3+. The necessity of physical contact or attachment by bacteria to mineral surfaces during oxidation reaction has not been fairly established so far. Temple and Koehler reported that during oxidation of marcasite T. thiooxidanswere found concentrated on mineral surface. Schaeffer, et al. demonstrated that physical contact or attachment is essential for oxidation of sulfur.

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Characterization of lead-bearing phases in municipal waste combustor fly ash

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100165045 ◽

1996 ◽

Vol 54 ◽

pp. 516-517

Author(s):

L. L. Sutter ◽

G. R. Dewey ◽

J. F. Sandell

Keyword(s):

Fly Ash ◽

Bottom Ash ◽

Municipal Waste ◽

Primary Concern ◽

Leaching Behavior ◽

Waste Combustion ◽

Lead And Cadmium ◽

Lead Speciation ◽

Accepted Practice

Municipal waste combustion typically involves both energy recovery as well as volume reduction of municipal solid waste prior to landfilling. However, due to environmental concerns, municipal waste combustion (MWC) has not been a widely accepted practice. A primary concern is the leaching behavior of MWC ash when it is stored in a landfill. The ash consists of a finely divided fly ash fraction (10% by volume) and a coarser bottom ash (90% by volume). Typically, MWC fly ash fails tests used to evaluate leaching behavior due to high amounts of soluble lead and cadmium species. The focus of this study was to identify specific lead bearing phases in MWC fly ash. Detailed information regarding lead speciation is necessary to completely understand the leaching behavior of MWC ash.

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