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 In the microbiological leaching process, iron-oxidizing bacteria oxidize pyretic phase to ferric iron and sulfuric acid, and uranium is dissolved from the ore due to sulfuric acid attack. [PDF] Microbial Leaching of Uranium Ore Semantic Scholar
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Progress in bioleaching: part B, applications of microbial processes
The second section of the mini-review will focus on new applications of microbial processes to mineral extraction, including (a) in situ recovery, (b) reductive Bacterial leaching of uranium ore in shaking flasks. Extraction of uranium during leaching with T. ferrooxidans, T. thiooxidans, and a mixed culture of both strains. Bioleaching: metal solubilization by microorganisms
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Microbially Assisted Leaching of Uranium—A Review
In this review, an attempt has been made to understand the process of bioleaching of uranium while deliberating on mechanism as to whether the reactions are The uranium leaching rates of BL and EBL in the central region were 81.14% and 84.47%, respectively, because of the enhancement of microbial activity by Enhanced bioleaching of granite-type uranium ore using an
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Microbial leaching for valuable metals harvesting:
It is to be concluded that microbial leaching is a revolutionizing technique bringing out both recovery of metals from solid materials including metal contaminated In the processes, iron and sulfur in pyrite were oxidized by the microorganisms as an energy sources and leaching acid. Therefore, proper amount of Enhanced uranium bioleaching high-fluorine and low
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Acid and ferric sulfate bioleaching of uranium ores: A review
This review examines the acid and ferric sulfate bioleaching of uranium from low grade ores. The review traces back the progression of the technology from the time the role of microorganisms was recognized in the 1950’s and 1960’s. Some past and present uranium mining operations with active or potential microbial contribution are summarized.The ore initially contained from 0.15 to 0.20% of uranium in the form of uraninite, but ore samples used in the study contained about 0.05% of uranium, as it was exhausted during acid leaching(PDF) Microbial Leaching of Uranium Ore ResearchGate
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Microbial Leaching of Uranium Ore Semantic Scholar
Microbial leaching is regarded as one of the most promising and certainly the most revolutionary solution to these problems in comparison with pyrometallurgy or chemical metallurgy. Microbial leaching is the extraction of metals from their ores using microorganisms. Microbial technology offers an economic alternative to the mining 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 Heap bioleaching of uranium from low-grade granite-type ore by
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Microbiological leaching of uranium ores SpringerLink
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 Microbial leaching of uranium and other trace elements P. fluorescens was the only species that thrived and mobilized measurable amounts of U from the two ores, leaching out 0.001–0.005% of(PDF) Microbial leaching of uranium and other trace elements
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Mechanism analysis on synergistic leaching of uranium from
Low-grade uranium ore, which was challenging to be treated economically by conventional methods, can be treated by uranium leaching by bacteria. However, high uranium concentration will lead to the death of bacteria. This work researched the oxidative leaching performance of bacteria (Acidithiobacillus ferrivorans This review examines the acid and ferric sulfate bioleaching of uranium from low grade ores. The review traces back the progression of the technology from the time the role of microorganisms was recognized in the 1950’s and 1960’s. Some past and present uranium mining operations with active or potential microbial contribution are summarized.Acid and ferric sulfate bioleaching of uranium ores: A review
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Metals Extraction from Sulfide Ores with Microorganisms: The
Metals extraction with microbes is not a novel approach; it has been applied for centuries; however, mechanism stays unknown. Isolation of A. ferrooxidans proves the role of microorganism in leaching. Today, A. ferrooxidans is most extensively characterized and commercially used for bioleaching [].Since 1970s, the number of microorganisms Microbes are playing increasingly important roles in commercial mining operations, where they are being used in the “bioleaching” of copper, uranium, and gold ores. Direct leaching is whenMining with Microbes Nature Biotechnology
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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 that of the underground mining. The biodissolution of uranium is a consequence of hydrometallurgical treatment of ore with microbial This chapter is a review of the microbiological leaching of uranium ores. 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 isMicrobial Leaching of Uranium Ore Semantic Scholar
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© 1995 Nature Publishing Group
being used in the "bioleaching" of copper, uranium, and gold ores. Direct leaching is when microbial metabolism changes the redox state of metal being harvested, rendering it more soluble.Bio-leaching studies were carried out in a 2 L bioreactor- BIOSTAT-B ® equipped with a PLC based controller at 20–40% (w/v) pulp density using enriched culture of A.ferrooxidans for Turamdih uranium ore (Jharkhand, India). With the enriched culture of A.ferrooxidans adapted on Fe(II) at pH 2.0, 35 °C and 20% (w/v) pulp density, a 98.3% Bioreactor leaching of uranium from a low grade Indian silicate ore
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Microbial Leaching of Uranium Ore ResearchGate
The uranium-leaching efficiency was not greatly affected by the addition of Fe2+ in the range of 5–9 g/l, and the leaching efficiency of uranium from the schists by A. ferrooxidanscould beMicrobiological 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 from the ore due to sulfuric acid attack.Microbial Leaching of Uranium Ore Semantic Scholar
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Uranium removal from a radioactive contaminated soil by defined
In the industrial system of microbial leaching, a single iron-oxidizing bacteria is basically used to leaching ore, but the pure strain has the problems of single metabolic type, poor adaptability, and jarosite is easy to form and cause hardening. Nevertheless, the mixed bacteria can complement each other and improve the metal INTRODUCTION. The process of acid leaching of metals such as copper and uranium from their ores is due principally to the activity of Thiobacillus ferrooxidans.Some metal extraction may be attributable to other organisms, and the activity of T. ferrooxidans may itself be increased by the presence of other microorganisms EXTRACTION OF METALS FROM ORES BY BACTERIAL LEACHING: PRESENT STATUS
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Microbial leaching of uranium and other trace elements from
Growth was accompanied by an increase in pH. It was observed that the higher the cell density, the more extensive the change in pH Table 1, Table 2, Table 3.In cultures with P. fluorescens grown with leached ore, a change in pH from 4.5 to 9.3 (ΔpH=4.8) was observed over a period of 8 days, whereas S. putrefaciens and P. stutzeri 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 Frontiers Sulfur enhancement effects for uranium bioleaching in
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