Microbial Leaching of Uranium from Low Grade Ore and …

It was observed that the highest percentages of bioleached uranium from the tested samples directly by Penicillium purpurogenium and Pseudomonas fluorescens SHA 281 were found to be 72.49, 55.49 and 60.06 %, respectively. Uranium (U) is one of the strategic elements and essential for many applications as a fuel in nuclear power plants and nuclear weapons. …

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Microbial Leaching of Uranium Ore

Microbiological leaching has been use as an alternative approach to conventional hydrometallurgical methods of uranium's extraction. In the microbiological leaching process, iron-oxidizing bacteria oxidize pyretic phase to ferric iron and sulfuric acid, and uranium is dissolved …

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Progress in bioleaching: part B, applications of microbial …

Later, attempts for in situ recovery of base metals have been undertaken. In the in situ leaching process, a leaching solution is injected into a subsurface ore body where valuable metals such as uranium or copper are dissolved from the ore. The pregnant leach solution (PLS) is pumped to the surface where metal extraction takes place.

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Microbial Leaching of Uranium from Low Grade Ore and …

2016. Uranium (U) is one of the strategic elements and essential for many applications as a fuel in nuclear power plants and nuclear weapons. Microbiological leaching has been used as an alternative approach to conventional hydrometallurgical methods of uranium's recovery from low grade ores and waste samples Penicillium purpurogenium and Pseudomonas fluorescens …

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Bioleaching: A microbial process of metal recovery; A …

The thin-layer leaching process originally conceived and developed for leaching oxide ores has been successfully adapted to bacterial leaching of mixed and secondary sulphide ores.

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Acid and ferric sulfate bioleaching of uranium ores: A review

Uranium is bioleached from ores in acidic ferric sulfate lixiviant. Ferric iron oxidizes tetravalent uranium to the hexavalent form and is thereby reduced to ferrous iron in this redox …

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Microbial Extraction of Uranium from Ores | Semantic Scholar

CONTENTS 3.1 Introduction 3.2 Uranium Leaching Methodologies 3.2.1 Chemical Leaching 3.2.2 Bioleaching 3.3 Modes and Mechanism of Uranium Bioleaching 3.3.1 Direct Mechanism 3.3.2 Indirect Mechanism 3.3.3 Bioleaching by Heterotrophs 3.4 Factors Influencing Bioleaching 3.4.1 Mineralogy of the Ore 3.4.2 Microorganisms 3.4.3 Temperature 3.4.4 pH …

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Sulfur enhancement effects for uranium bioleaching in …

The feasibility of sulfur enhancement for uranium bioleaching in column reactors was assessed with a designed mixed Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferriphilum from a refractory uranium ore. The uranium extraction reached 86.2% with the sulfur enhancement (1 g/kg) in 77 days leaching process, increased by 12.6% …

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Microbiological leaching of uranium ores | Mining

Microbiological leaching has been used as an alternative approach to conventional hydrometallurgical methods of uranium extraction. In the microbiological leaching process, iron-oxidizing bacteria oxidize pyritic phases to ferric iron and sulfuric acid, and uranium is solubilized from the ore due to sulfuric acid attack. If uranium in the ore material is in the reduced, …

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Methods of metal recovery by microorganisms | PDF

Bioleaching or microbial leaching: This broadly involves the extraction or solubilization of minerals from the ores by the microorganisms. 2. Bio-sorption: It deals with the microbial cell surface adsorption of metals from the mine wastes or dilute mixtures. ... (FeS2) within the uranium ore. For optimal extraction of uranium by bioleaching ...

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Linked variations of bioleaching performance, extracellular …

Uranium, an essential source of nuclear fuel, has been increasingly applied in electricity generation and defense industry [1,2,3].Bioleaching, as an economical and eco-friendly metallurgical method [1, 2], has been identified to be one of the alternatively available ways for uranium extraction from the complex and refractory or low-grade ores using stirred tank …

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Microbiological leaching of uranium ores

Microbiological leaching of uranium ores. Olli Tuovinen. 1999, Mining, metallurgy & exploration. See full PDF download Download PDF. Related papers. Mineral Processing and Extractive Metallurgy Review: An International Journal Microbially Assisted …

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A study of the bioleaching of a Spanish uranium ore. Part I: A …

Microbiological activity inside the heap is conditioned by its mineral composition and environmental and operational factors must also be taken into account. The industrial …

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Development of Technology for the Bioleaching of Uranium …

In biological leaching processes, for instance, as described in studies such as Abnilash et al.'s "Bioreactor Leaching of Uranium from Low-Grade Indian Silicate Ore," the optimal density of the "pulp" plays a crucial role in enhancing the efficiency of uranium extraction. Maintaining the pulp density at 20–40% ensures optimal ...

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Microbial Leaching of Uranium Ore

Microbial Leaching of Uranium Ore. Written By. Hadi Hamidian. Submitted: 24 October 2010 Published: 09 September 2011. DOI: 10.5772/17941. DOWNLOAD FOR FREE. Share. Cite IntechOpen. Nuclear Power Deployment, Operation ...

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Bioleaching of low-grade uranium ore using Acidithiobacillus …

Bioleaching of uranium was carried out with Turamdih ore sample procured from Uranium Corporation of India Limited, Jaduguda. The bacterial strain that was used in the leaching experiments was isolated from the Jaduguda mine water sample. Efficiency of bioleaching was studied by varying parameters like pulp density and initial ferrous …

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Frontiers | Sulfur enhancement effects for uranium …

The column leaching experiments included two phases, acidic pre-leaching and microbial leaching (Yang et al., 2022). The column leaching turned into bioleaching phase when pH of the leaching liquor was at approx. 3.0. ... (2.79%) of the raw ore was sufficient for leaching of uranium. However, it would be transferred into jarosite on the surface ...

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Column leaching of uranium ore with fungal metabolic …

Uranium is one of the strategic elements and is used as a fuel in nuclear power plants. The application of microorganisms in the recovery of uranium can effectively reduce investment cost, improve uranium recovery and shorten the leaching cycle [1, 2].Bacterial leaching of uranium with chemoautotrophic bacteria has been extensively studied, including …

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Bacterial leaching of uranium ore from Figueira—PR, Brazil, …

A bacterial leaching program was carried out in order to evaluate the potential of applying this process to leach uranium from the ore of Figueira—PR, Brazil. The experiments were carried out in shake flasks, column percolation …

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Uranium extraction from a low-grade, stockpiled, non-sulfidic ore

In this study, an experimental column system is used to emulate the heap leaching process but on a much smaller and controlled scale in order to evaluate the leaching biogeochemistry of a non-sulfidic ore. An indigenous, active microbial community was prepared by concentrating biomass derived from the uranium extraction process from the Ranger ...

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Bioleaching: Microorganisms, Types, Factors, …

Indirect Bacterial Leaching (Non- contact leaching) In Indirect bacterial leaching, no direct contact between the microorganisms and the mineral occurs. ... The bacteria, particularly T. ferrooxidans, do not directly attack the …

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A study of the bioleaching of a Spanish uranium ore. Part I: …

Bioleaching and ore mineralogy Although there has been no definitive study of the influence which the type of uranium ore has on bacterial leaching, the literature [ 35,36 ] suggests that the pyrite content of the ore is of fundamental importance. For this reason, this type of attack has not been widely used in the extraction of uranium from ...

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Characterization of groundwater and cores in the …

ISL uranium mining is mainly divided into three types: acid in-situ leaching, alkaline in-situ leaching and CO 2 +O 2 in-situ leaching. In acid in-situ leach (AISL) mining, U(IV) minerals undergo oxidation by H 2 O 2 or Fe 3+ to generate highly soluble uranyl sulfate species [UO 2 (SO 4 ) 2 ] 2- or [UO 2 (SO 4 ) 3 ] 4-, with the process being ...

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Bacterial leaching of uranium ore from Figueira—PR, Brazil, …

A bacterial leaching program was carried out in order to evaluate the potential of applying this process to leach uranium from the ore of Figueira-PR, Brazil. The experiments were carried out in shake flasks, column percolation (laboratory and scmipilot scale)and in …

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Bioleaching of low-grade volcanogenic uranium deposits at …

Uranium is an important strategic resource, which is mainly extracted from uranium ore. Acid leaching is the most commonly used uranium extraction technique, with sulfuric acid used as the leaching agent and MnO 2 or NaClO 3 used as the oxidants [].As the hard rock type high-grade uranium resources in southern China is gradually decreasing and the mining depth …

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Bioleaching, or microbial ore leaching

• Bioleaching, or microbial ore leaching: is a process used to extract metals from their ores using bacterial micro-organisms. • The bacteria feed on nutrients in the minerals, causing the metal to separate from its ore. • The metals commonly extracted using this process include gold, silver, zinc, copper, lead, arsenic, antimony, nickel ...

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Bioleaching of iron, copper, gold. uranium | PPT

IN–SITU LEACHING: • Ore remains in natural state while leaching process takes place. ... oxide in order to leave the iron behind. • Acidithiobacillus ferrooxidans are used as bacterial agents. • Maximum extraction occurs at pH 1.3 Fe2O3+3CO 2Fe+3CO2 ... (FeS2) in uranium ore and produces ferric sulphate and sulphuric acid • The ...

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Microbial Leaching of Uranium from Low Grade Ore and …

Uranium (U) is one of the strategic elements and essential for many applications as a fuel in nuclear power plants and nuclear weapons. Microbiological leaching has been used as an alternative ...

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Enhanced uranium bioleaching high-fluorine and …

Compared with traditional leaching methods for uranium ore [3], the bioleaching method has demonstrated the advantages of low cost and improved environmental safety and has been shown to be a ...

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Microbial leaching

  1. The process by which metals are dissolved from ore-bearing rocks using micro-organisms is termed as microbial leaching.
  2. In present time, a number of ores cannot be economically processed with chemical methods because of their low metal content.
  3. Moreover, in course of separation of higher-grade ores, large quantities of low-grade ores ar…
  1. The process by which metals are dissolved from ore-bearing rocks using micro-organisms is termed as microbial leaching.
  2. In present time, a number of ores cannot be economically processed with chemical methods because of their low metal content.
  3. Moreover, in course of separation of higher-grade ores, large quantities of low-grade ores are produced, which are generally discarded in waste heaps.
  4. There are vast quantities of such low-grade copper ores throughout the world, which cannot be profitably purified by means of conventional chemical methods, but could be processed by microbial leac...
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Heap bioleaching of uranium from low-grade granite-type ore …

We evaluated uranium bioleaching from low-grade, granite-type uranium ore using mixed acidophilic microbes from uranium mine leachate. A 4854-ton plant-scale heap bioleaching process achieved sustained leaching with a uranium leaching efficiency of 88.3% using a pH of 1.0–2.0 and an Fe3+ dosage of 3.0–5.5 g/L. Acid consumption amounted to 25.8 g H2SO4 …

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BACTERIAL LEACHING OF A CARBONATE BEARING …

characteristics of the individual ore, i.e. the leaching conditions have to be established for each type of ore. The solubilization of uranium is an indirect bacterially catalyzed process. In the present paper investigations on the applicability of bacterial leaching of sedimentary uranium ore from Forstau (Austria) are described.

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Microbial Leaching of Uranium Ore

Leaching rate of uranium from exhausted ore depended on both sulfuric acid concentration and microbial activity of bacteria isolated from acid mine drainage, formed on uranium deposit.

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Bioleaching and Biomining

Uranium Leaching •Uranium leaching is an indirect process. •When T.ferroxidans are involved in uranium extraction, they do not directly attack on ore but on the iron oxidants. •The pyrite reaction is used for the initial production of Fe Reaction: 2FeS + …

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Microbial Leaching of Uranium Ore

Microbial Leaching of Uranium Ore. Written By. Hadi Hamidian. Submitted: 24 October 2010 Published: 09 September 2011. DOI: 10.5772/17941. DOWNLOAD FOR FREE. …

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Microbial Leaching for Recovery of Nickel and Cobalt from Lateritic Ore

The use of heterotrophic fungi (strains of Aspergillus and Penicillium) and bacteria (strains of Bacillus and Pseudomona) for metal recovery have been extensively studied.However, in case of nickel recovery from lateritic ores, strains of Aspergillus and Penicillium are the most preferred microorganisms.Acidithiobacillus ferrooxidans a chemolithotrophic bacterium has …

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Bioleaching of low-grade uranium ore using Acidithiobacillus

The bacterial strain that was used in the leaching experiments was isolated from the Jaduguda mine water sample. Efficiency of bioleaching was studied by varying parameters like …

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Interaction of dry and water-saturated uranium ore with …

The optimal microbial leaching conditions with a mixed bacterial strain (Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans) for microwave-treated uranium ore were: pH of 1.58, pulp density of 10.11 %, Fe 2+ concentration of 3.67 g/L (Liu et al., 2021). Microwave treatment is proved to be an effective method to damage gangue ...

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Bacterial leaching method for refractory uranium ore

The invention provides a bacterial leaching method for refractory uranium ores, and belongs to the technical field of biological metallurgy. The method comprises the following steps: mixing sulfur powder into uranium ore, and performing acid leaching by using a sulfuric acid solution to obtain an adsorption tail solution; inoculating the domesticated and cultured compound bacterial liquid …

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