copper mining process by acidithiobacillus ferroxidans

Acidithiobacillus ferrooxidans

The most-studied leaching bacteria are from the genus Acidithiobacillus. Acidithiobacillus ferrooxidans and A. thiooxidans are acidophilic mesophiles and together with the moderate thermophile, A. caldus, they belong to the Gram-negative γ-proteobacteria [25].The A. ferrooxidans has been considered as a model biomining microorganism [17, 22] and its cells can be seen by scanning …

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Biolixiviación de mineral cuarzo por Acidithiobacillus ...

Acidithiobacillus ferrooxidans. in 9K medium and quartz mineral, with quartz sandstone, cuprite and pyrite at different particle sizes. It was found that at 24 days o f the chemical leaching process 86% o f copper was recovered when bacteria were included and only 54% recovered without them.

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Copper Mining Using Acidothiobacillus

leaching is played by the acidophilus bacteria Acidithiobacillus ferrooxidans.12,23,24 In this paper we review the physiology of acidophilic microorganisms, and application areas of bioleaching with Acidithiobacillus ferrooxidans in copper mining and metallurgy, as well as the impacts of electrochemistry, type of minerals and addition

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Biosynthesis of jarosite by Acidithiobacillus ferrooxidans ...

In the copper bioleaching process, the formation of jarosite on the surface of the biooxidized metal sulfide particle significantly decreases the rate of bioleaching. The main goal of this study to investigate the formation mechanism of ammonium jarosite, by Acidithiobacillus ferrooxidans isolated from Sarcheshmeh copper mine.

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BIO-HYDROMETALLURGY FOR EXTRACTION OF …

behavior to copper, iron, or nickel ions has been demonstrated for Leptospirillum ferrooxidans. Genes involved in the chemotaxis were also detected in Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. It can be explained by the following reaction: 2FeS2 + 702 + 2H20 2FeSO4 + 2H2SO4 2.

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EXTRACTION OF GOLD FROM WASTE PRINTED CIRCUIT …

The bioleaching process is now emerging as commercial exploitable technology ... efficiency of recovery of metals can be increased, as revealed in copper and gold mining where low grade ores are biologically treated to obtain metal values, which are not accessible by conventional treatments ... (Acidithiobacillus ferroxidans and ...

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Isolation and Characterization of Acidithiobacillus ...

 · The present work describes a research approach to the aerobic bioleaching of U (IV) ores. Three strains (Acidithiobacillus sp.) isolated from sulfur springs in Ramsar province, Iran and nucleotide sequences of gene fragments of examined Acidithiobacillus sp. strains were recorded in NCBI .Then, uranium bioleaching experiment carried out with native bacteria in different pulp densities.

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Acidithiobacillus ferrooxidans: A bioleaching bacteria for ...

Acidithiobacillus ferrooxidans formerly called Thiobacillus ferrooxidans is an extreme acidophilic chemolithotrophic, gram-negative eubacterium, which is well adapted to low pH (1.6) environment. It is active in the solubilization of copper and in the processing of refractory gold

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Acidithiobacillus thiooxidans

 · Acidithiobacillus thiooxidans are most commonly located in soil, sewer pipes and cave biofilms also known as "snottites". Snottites are acidic biofilms that are formed by sulfur oxidizing microbes in caves rich in sulfide. A. thiooxidans in the biofilm produce sulfuric acid as a byproduct, which degrades the cave surfaces (Figure 3). This same process can occur in industrial pipes and ...

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Isolation and Characterization of Acidithiobacillus ...

Isolation and Characterization of Acidithiobacillus ferrooxidans Strain D3-2 Active in Copper Bioleaching from a Copper Mine in Chile Tsuyoshi SUGIO, 1;y Masanori WAKABAYASHI, Tadayoshi KANAO,1 and Fumiaki TAKEUCHI2 1Division of Bioscience, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan

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Formation of jarosite and its effect on important ions for ...

In this study, a pure culture of A. ferrooxidans bacteria was used. The bacteria were separated from acid mine drainage from the Sarcheshmeh copper mine and adapted with low-grade Sarcheshmeh copper sulfide ore [16]. The growth medium (Table 1) with an initial pH of 1.8 was used for the A. ferrooxidans bacteria, and the

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Specific mechanism of Acidithiobacillus caldus ...

nism was strengthened by the adapted adsorption behavior in the bioleaching of copper-bear-ing sulfide ore by A. thiooxidans and A. ferrooxidans [27]. The effects of the "non-contact" mechanism on community structure during chalcopyrite bioleaching by Acidithiobacillus sp. …

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Synergy between Rhizobium phaseoli and Acidithiobacillus ...

 · Abstract. This study investigates the synergy of Rhizobium phaseoli and Acidithiobacillus ferrooxidans in the bioleaching process of copper. The results showed that additional R. phaseoli could increase leaching rate and cell number of A. ferrooxidans.When the initial cell number ratio between A. ferrooxidans and R. phaseoli was 2 : 1, A. ferrooxidans attained the …

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The catalytic role of Acidithiobacillus ferrooxidans for ...

leaching is played by the acidophilus bacteria Acidithiobacillus ferrooxidans.12,23,24 In this paper we review the physiology of acidophilic microorganisms, and application areas of bioleaching with Acidithiobacillus ferrooxidans in copper mining and metallurgy, as well as the impacts of electrochemistry, type of minerals and addition

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Acidithiobacillus ferrooxidans metabolism: from genome ...

 · Background. Acidithiobacillus ferrooxidans is a Gram-negative, γ-proteobacterium that thrives optimally at 30°C and pH 2, but can grow at pH 1 or lower [] is abundant in natural environments associated with pyritic ore bodies, coal deposits, and their acidified drainages [2,3] is an important member of microbial consortia used to recover copper via a process known as bioleaching or ...

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Subject: "Acidithiobacillus ferrooxidans"

Acidithiobacillus ferrooxidans ATCC23270 is a gram-negative and autotrophic bacillus acquiring energy via the oxidation of iron and sulfur. The pet II operon is involved in the sulfur metabolism of A. ferrooxidans. However, the mechanisms that control the expression of the pet II …

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Bioleaching of low-grade copper sulfide ores by ...

 · The grown conditions of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans were investigated, and then experiments were conducted to research the bioleaching behaviors of crude ore of copper sulfide and hand-picked concentrates of chalcopyrite by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. The experimental results show …

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Differential gene expression in response to copper in ...

Locus afe_0454 from Acidithiobacillus ferrooxidans (At.ferrooxidans) is annotated as related to copper resistance in The Institute for Genomic Research database. In our study, two At.ferrooxidans strains, 26(#) and DC, with different levels of copper ion resistance were isolated from acid mine drain …

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Fe Extraction from Cayeli Copper Ores by Bioleaching with ...

 · Keywords: Bioleaching, Acidithiobacillus ferrooxidans, Extraction, Copper, Iron, Optimization. Introduction Bioleaching is a new technique used by the mining industry to extract minerals such as gold and copper from their ores while traditional extractions involve many expensive steps such as roasting and smelting, which requires sufficient ...

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Copper biomachining mechanisms using the newly isolated ...

 · Acidithiobacillus ferrooxidans B1 was found to be the most effective strain during copper biomachining of a workpiece among 6 isolated A. Ferrooxidans strains. A. ferrooxidans B1 was tested for copper biomachining at various conditions, such as pH regulation (pH 1.8 or unregulated), temperature control (4 °C, 20 °C) and inoculation strategy.

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Investigation of some heavy metals toxicity for indigenous ...

The resistance of indigenous Acidithiobacillus ferrooxidans to metals such Cd +2, Co +2 and Zn +2 was investigated in the process of bioleaching tailing and low grade ore. Materials and methods: Iron-sulfur oxidizing bacterium, At. ferrooxidans, has been isolated from pregnant leaching solution (PLS) of the Sarcheshmeh copper mine. At ...

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Original Research Catalytic Efficiency of ...

content present in the ore matrix was solubilized during 30 days of the leaching process mediated by Acidithiobacillus ferrooxidans at 30ºC. Copper dissolution from ore was found to be directly related to the reaction pH (1.5-1.9). The leaching data obtained from the pulp densities (5, 10 and 20% wt/vol) at *e-mail: [email protected]

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Heavy Metal Pollution from Gold Mines: Environmental ...

Gold mining can be open-pit or deep shaft mixed with other HM such as copper (Cu), silver (Ag) and lead (Pb). Its location determines the type of mining process to be used in extraction and the amount of wastes that will be generated. In the past, small quantities of waste were generated by

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Study of the Adhesion Mechanism of Acidithiobacillus ...

In the present work, the streaming potential of A. ferrooxidans and pyrite was measured in two environments: fresh and saline water (water with 35 g/L of NaCl) at different pH values. Also, attachment kinetics of A. ferrooxidans to pyrite was studied in fresh and saline water at pH 4. The results show that A. ferrooxidans and pyrite had lower streaming potentials (comparing absolute values) in ...

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Two-step biohydrometallurgical technology of copper-zinc ...

Three mixed microbial cultures of acidophilic microorganisms were enriched from industrial mining sites: two autotrophic mesophilic cultures containing Acidithiobacillus ferroxidans and Leptospirillum spp. (grown at 30 and 35 °C), and a mixotrophic moderate thermophilic culture containing Sulfobacillus thermotolerans, Leptospirillum ...

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Bioleaching, Viable Alternative For The Treatment Of Some ...

In the genus Acidithiobacillus have studied the Acidithiobacillus Thiooxidans, Acidithiobacillus Caldus and Acidithiobacillus Ferrooxidans, characterized by its favorable evolution at temperatures between 28 and 34 °C, use CO 2 as a source of carbon and …

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Acidithiobacillus ferrooxidans metabolism: from genome ...

 · Acidithiobacillus ferrooxidans is a Gram-negative, γ-proteobacterium that thrives optimally at 30°C and pH 2, but can grow at pH 1 or lower [] is abundant in natural environments associated with pyritic ore bodies, coal deposits, and their acidified drainages [2, 3] is an important member of microbial consortia used to recover copper via a process known as bioleaching or …

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The Chemolithoautotroph Acidithiobacillus ferrooxidans Can ...

 · The chemolithoautotrophic bacterium Acidithiobacillus ferrooxidans is of great importance in biomining operations. During the bioleaching of ores, microorganisms are subjected to a variety of environmental stresses and to the limitations of some nutrients, such as inorganic phosphate (Pi), which is an essential component for all living cells. Although the primary source of phosphorus for ...

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Microbes and mineral recovery: Bioleaching of copper, gold ...

In the beginning of 1950´s Thiobacillus ferrooxidans and Thiobacillus thiooxidans were indentified (currently Thiobacillus has been renamed to Acidithiobacillus) In 1950´s copper dump leaching In 1960´s the first industrial copper heap leaching operation First industrial gold bioleaching plant in 1980´s

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Acidithiobacillus ferrooxidans

 · Acidithiobacillus ferrooxidans PubMed Genome of ATCC 23270 Genome of ATCC 53993. Description and Significance. A. ferrooxidans is a Gram negative rod shaped bacterium that is commonly found in deep caves or acid mine drainage, such as coal waste (10, 11, 12). These acidophilic bacteria thrive in optimal pH level of 1.5 – 2.5 where they ...

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Synergistic Copper Extraction Activity of ...

Acidithiobacillus ferrooxidans strains were isolated from mineral wastes in 2 copper coal mining areas in the modified 9K-culture medium containing ferrous ions as the sole source of energy. The isolated bacteria were added to the copper coil mining samples in leaching mini-plants. The total Cu content of samples, which measured by atomic absorption, decreased to 66.7% in sterilized samples ...

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The catalytic role of Acidithiobacillus ferrooxidans for ...

 · Application of acidithiobacillus ferrooxidans in bioleaching of waste in mining and copper metallurgy The main waste - waste rocks, flotation tailings and slag- from mining and metallurgy of copper, are often rich in metal content, and sometimes an …

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