OneTunnel | Bacterial Leaching of Elliot Lake Uranium Ore
"Uranium may be leached to some extent in situ from the Blind River conglomerate uranium ores by using the products of bacterial activity from the bacterium Thio-bacillus ferrooxidans his paper describes some of the laboratory techniques used to investigate the characteristics of the bacteria, and to utilize their properties in uranium leaching. The application of some of the …
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[PDF] Microbial Leaching of Uranium Ore | Semantic Scholar
This chapter is a review of the microbiological leaching of uranium ores. Microbiological leaching has been use as an alternative approach to conventional …
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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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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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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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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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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 of copper, gold and uranium | PPT
Bioleaching of Uranium is indirect process. T. ferrooxidans does not directly attack on uranium ore, but on the iron oxidant. Fe3+ (Ferric ions) is used as an oxidant in the leaching of Uranium from Uraninite (UO2). The pyrite reaction is used for …
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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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Acid and ferric sulfate bioleaching of uranium ores: A review
Uranium is usually finely disseminated in ore bodies, making leaching the most common process to recover it instead of ore dressing for concentrate production. Many uranium ores processed via bioleaching have contained significant amounts of pyrite and other Fe-sulfides, which are oxidized to acidic ferric sulfate.
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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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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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Microbially Assisted Leaching of Uranium—A Review
Bioleaching of uranium from the ores, minerals, and wastes in heap and dumps, besides in-situ biodissolution processes, is rapidly expanding globally, and its economic values may exceed …
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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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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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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 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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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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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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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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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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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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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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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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Review on bioleaching of uranium from low-grade ore
The microbiological and chemical reactions in the production of leach liquors and in the leaching of uranium ore materials are presented. Microbiological factors are evaluated for dump and heap ...
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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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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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Bioleaching | PPT
Uranium leaching is an indirect process When T.ferrooxidants 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; …
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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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