Microbial Leaching Of Uranium Ore

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 …

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

In shake flasks and in column percolation experiments at laboratory scale, bacterial activity on Ihe ore was confirmed: approximately 60% of uranium was leached, against around 30% in sterilized controls. Abstract 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, …

Optimization of operating parameters and rate of uranium …

In this study the bioleaching of a low-grade uranium ore containing 480 ppm uranium has been reported. The studies involved extraction of uranium using Acidithiobacillus ferrooxidans derived from the uranium mine samples. The maximum specific growth rate (µ max) and doubling time (t d) were obtained 0.08 h−1 and 8.66 h, respectively. Parameters such as …

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 …

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% …

Microbially Assisted Leaching of Uranium—A Review

The biodissolution of uranium is a consequence of hydrometallurgical treatment of ore with microbial intervention. Uranium bioleaching is mainly driven by the combined action …

Approaches to uranium dump processing by bioleaching …

In addition, using microbial leaching there's no need in further uranium ore grinding and that reduces costs to process ura-nium dumps. The work proposes a scheme for processing uranium dumps in the technological process. This technology will contribute to transforming the places for uranium waste storage into anthropogenic deposits.

Enhanced uranium bioleaching high-fluorine and low-sulfur uranium ore …

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 ...

Microbial Leaching for Recovery of Nickel and Cobalt from Lateritic Ore

Microbial Leaching for Recovery of Nickel and Cobalt from Lateritic Ore: A Review ... India are composed of both nickel and copper with a trace association of uranium. Nickel percentage in these ores varies from 0.3 to 0.8%. ... Acidithiobacillus ferrooxidans a chemolithotrophic bacterium has been reported to solubilize nickel from lateritic ...

Bioleaching of uranium from low-grade uranium ore with a …

Aiming at recovery of uranium (U) from low-grade uranium ore with a high fluorine content, column bioleaching of uranium extraction with an indigenous mesophilic consortium was studied. The performance of the bacterial community and the effect of chemical parameters on column bioleaching of uranium were investigated. The results showed that U …

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 ...

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 …

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

hydrometallurgy ELSEVIER Hydrometallurgy38 (1995) 39-57 A study of the bioleaching of a Spanish uranium ore. Part I: A review of the bacterial leaching in the treatment of uranium ores J.A. Muoz, F. Gonzez, M.L. Blquez, A. Ballester Departamento de Ciencia de los Materiales a Ingenier Metalgica, Facultad de Ciencias Quicas, Universidad …

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 …

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 …

Microbially Assisted Leaching of Uranium—A Review

The biodissolution of uranium is a consequence of hydrometallurgical treatment of ore with microbial intervention. Uranium bioleaching is mainly driven by the combined action of Fe(III) and the protons that are produced by the activity of chemolithotrophic micro-organisms which use either iron or sulfur as their energy source for their growth.

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

The effect of various chemical parameters such as NO 3-, HCO 3-, EDTA and citric acid on the uranium leaching from phosphate rock samples has been investigated by means of batch-type experiments and the total uranium concentration in the solution was analyzed by ICP-OES.EDTA has been found to leach uranium from phosphate rock at the highest rate, …

Enhanced uranium bioleaching high-fluorine and low-sulfur uranium ore …

In the processes, iron and sulfur in pyrite were oxidized by the microorganisms as an energy sources and leaching acid. Therefore, proper amount of pyrite is an important factor for microbial leaching uranium methods [24, 26]. 80–90% of uranium in the ore with about 1–2% of pyrite of the Elliot Lake uranium mine in Canada were recovered using bioleaching.

Bioleaching: metal solubilization by microorganisms

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 …

Heap bioleaching of uranium from low-grade granite-type …

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 …

Enhanced bioleaching of granite-type uranium ore using an …

This study investigates the effect of an applied electric field on the enhancement of uranium ore bioleaching. It has been shown that the Fe 2+ oxidation rate of bacteria was …

Bioleaching: A microbial process of metal …

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.

Gold leaching from ores using biogenic lixiviants – A review

Heap leaching. Stage 1: acidophilic chemolithotrophic bioleaching for copper for eight months. Stage 2: bacterial leaching using microbial protein hydrolysate in the presence of thiosulphate and copper ions to solubilize gold and silver; crushed size less than 10 mm, pH: 9.5–10.0, for 30 days, irrigation rate: 200 L/ton of ore per 24 h

Microbial Leaching of Uranium Ore | IntechOpen

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 ...

Bioleaching

Ann Rev Microbiol 1980; 34, 263- 283 5. Mashbir D S. Heap leaching of low-grade uranium ore. Min Cong J 1964; 50: 50- 54. 6. Fisher J R. Bacterial leaching of Elliot Lake uranium ore. Can Min Metall Bull 1966; 59: 588-592 7. McCready R G L, Wadden D, Marchbank A. Nutrient requirements for the in-place leaching of uranium by Thiobacillus ...

Enhanced bioleaching of granite-type uranium ore using an …

This study investigates the effect of an applied electric field on the enhancement of uranium ore bioleaching. It has been shown that the Fe 2+ oxidation rate of bacteria was increased by 28.52% under an applied electric field with a current intensity of 10 mA. The leaching rate of uranium due to bioleaching with an applied electric field reached 93.02%, …

Microbial leaching for valuable metals harvesting: versatility …

Uranium can be successfully recovered by flooding the fractured ores containing uranium with the bacterial community causing the leaching process. Bioleaching of uranium …

Bioleaching of low grade uranium ore containing pyrite using …

A process of uranium extraction from ore containing 3.1 % pyrite by bacterial leaching was investigated in shaken flasks during 90 days. The highest uranium recovery amounting to 85.1 % was ...

(PDF) Microbial Leaching of Uranium Ore

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 ...