Uranium Mining and Extraction from Ore

201683 · Uranium leaching is the process by which the uranium is extracted from the raw ore by reacting the material with acid or base. Fig. 2 shows a general process flow for the uranium extraction process. Prior to the …

Microbial Leaching of Uranium from Low Grade Ore and …

On the Leaching Behavior of Uranium- Bearing Resources in Carbonate- Bicarbonate Solution by Gaseous Oxidants State-Of-The-Art Report on the Progress of Nuclear Fuel Cycle Chemistry Nov. 29, 1966 A. V. HENRICKSON 3,288,570 PRECIPITATE Zr (CO)

Bioleaching of low-grade uranium ore using …

201039 · Bioleaching of uranium was carried out with Turamdih ore sample procured from Uranium Corporation of India Limited, Jaduguda. ... Albinsson Y., Arlinger J., Ödegaard-Jensen A., Andlid T., Pedersen K. Microbial leaching of uranium and other trace elements from shale mine tailings at Ranstad. Geoderma. 2004; 122:177–194. doi: 10.1016/j ...

INIS Repository Search

INIS Repository Search provides online access to one of the world''s largest collections on the peaceful uses of nuclear science and technology. The International Nuclear Information System is operated by the IAEA in collaboration with over 150 members.

Solidification of uranium tailings using alkali-activated slag …

2  · The uranium tailings were obtained from a uranium tailings reservoir in China, with a water content of 10.91%, a density of 2.55 t/m 3, and a volume density of 1.375 t/m 3.The main chemical compositions of experimental materials obtained via X-ray fluorescence (XRF) analysis (PANalytical Axios) are presented in Table 1.The pH of the uranium tailings was 5.29 …

Microbial Leaching of Uranium Ore

2009101 · PDF | The rapid growth demand for power follows that nuclear power industry has led to progressive exhaustion of high grade reserves of uranium ore and... | Find, read …

Microbial Leaching of Uranium Ore

201199 · 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. …

Review of Biohydrometallurgical Metals Extraction from …

This review has as its underlying premise the need to become proficient in delivering a suite of element or metal products from polymetallic ores to avoid the predicted exhaustion of key metals in demand in technological societies. Many technologies, proven or still to be developed, will assist in meeting the demands of the next generation for trace and rare metals, potentially …

REVIEW Microbial Leaching of Uranium Ore

Key Words: Uranium, Microbial, Leaching, Nuclear, Pyrometal-lurgy, Refractory, Processing. INTRODUCTION This paper is a review of the microbiological leaching of uranium ores. …

Bacterial leaching of uranium ore from Figueira—PR, …

199371 · A great number of studies [4-6] have shown that this microbial activity is due to the oxidative metabolism of some Thiobacillus species, mainly Thiohacillus ferrooxidans, on …

Bacterial leaching of ores and other materials

2018227 · Bacterial ore leaching can be applied to extract heavy metals from low grade ores, industrial wastes and other materials on an industrial scale by different procedures: dump leaching, in situ leaching, tank leaching, …

[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 hydrometallurgical methods of uranium''s extraction. In the microbiological leaching process, iron-oxidizing bacteria oxidize pyretic …

Frontiers | Release behavior of uranium from a uranium …

20221012 · In this study, nine soils at different depths in a decommissioned uranium tailing pond in Jiangxi Province are selected as the research objects to study their mineralogical properties and reveal the leaching law of radioactive element uranium under natural rainfall conditions. The research results are as follows: 1) The distribution characteristics of uranium …

Microbial leaching of uranium ore

One proposed method is microbial leaching. 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 ...

Bacterial leaching of uranium ore from Figueira—PR, …

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, We use cookies to enhance your experience on our website continuing to use our website, you are …

Distribution of iron-oxidizing bacteria in the Nordic …

Iron-oxidizing bacteria are present within the top 2 m (but not always at the surface) and near the water table-capillary fringe of the vegetated Nordic uranium deposit, Elliot Lake, Ontario, Canada. They are distributed uniformly in the top 0.5 m of unvegetated tailings. The locations of these bacteria correlate with zones of pyrite oxidation as delineated in previous studies by the …

Microbial diversity in uranium mine waste heaps

Two different uranium mine waste heaps near Ronneburg, Thuringia, Germany, which contain the remains of the activity of the former uranium-mining Soviet-East German company Wismut AG, were analyzed for the occurrence of lithotrophic and chemoorganotropic leach bacteria. A total of 162 ore samples were taken up to a depth of 5 m.

(PDF) Microbial leaching of uranium and other trace …

2004101 · P. fluorescens grown with ore caused a change in pH in the growth medium from 4.7 to 9.3, which was significantly higher than for the other two species, for which pH was about 5.2.

Microbial Leaching of Uranium Ore

2018925 · microbiological leaching of uranium ores. Harrison et al. (1966) reported the role of th e iron oxidizing Acidithiobacillus ferrooxidans in leaching of uranium. The uranium ore was st acked in heaps, similar to dump leaching of low-grade copper ore, and leached using an acid ic ferric sulfate solution at the Elliot Lake Mine, Ontario, Canada.

Seepage characteristics of the leaching solution during in …

2  · Request PDF | Seepage characteristics of the leaching solution during in situ leaching of uranium | Investigating the seepage characteristics of the leaching solution in the ore-bearing layer ...

Table 1 from 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 from the ore due to sulfuric acid attack.

Pressure Leaching of Uranium

2021218 · Two distinct types of ore are treated at the mill, those occurring in the Westwater formation, and those occurring in what is known as the Poison Canyon formation, which incidentally is a somewhat refractory ore. It will suffice to say that the leaching circuits are fed a slurry containing from 12 to 15 percent plus-65-mesh material and from 35 ...

Microbial reduction of uranium

REDUCTION of the soluble, oxidized form of uranium, U(VI), to insoluble U(IV) is an important mechanism for the immobilization of uranium in aquatic sediments and for the formation of some uranium ores1-10. U(VI) reduction has generally been regarded as an abiological reaction in which sulphide, molecular hydrogen or organic compounds function as the reductant1,2,5,11.

Microbial Leaching of Uranium Ore

201199 · Our authors and editors. We are a community of more than 103,000 authors and editors from 3,291 institutions spanning 160 countries, including Nobel Prize winners and some of the world''s most-cited researchers.

Microbial Leaching of Uranium Ore

2018925 · microbiological leaching of uranium ores. Harrison et al. (1966) reported the role of th e iron oxidizing Acidithiobacillus ferrooxidans in leaching of uranium. The uranium ore …

[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 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.

MANUAL FOR URANIUM ORE PROCESSING

2010114 · The extraction of uranium from its ores generally involves the following unit operations (Fig. 1). (a) Size reduction The ore is crushed and ground to a suitable range of particle sizes required for effective leaching and to produce a material that can be slurried and pumped through the processing circuits. (b) Leaching

Microbial leaching of uranium and other trace elements …

2004101 · The fact that the pH in the kolm experiments was higher than in the leached ore experiments is likely explained by the use of only 1.5 g in the study as compared with 6.0 g of …

Pyrite Oxidation And Its Control Amd Molecular …

20221015 · pyrite-oxidation-and-its-control-amd-molecular-oxidation-mechanisms-microbial-role-k 1/1 Downloaded from voice .my on October 15, 2022 by guest ... Uranium in the Environment Broder J. Merkel 2006-01-16 Uranium is an element to be found ubiquitous in rock, soil, and water. Uranium concentrations in natural ground water can be more than ...

Microbial Biogeochemistry of Uranium Mill Tailings

200511 · Uranium mill tailings (UMT) are the crushed ore residues from the extraction of uranium (U) from ores. Except where ores have a high carbonate content, the commercial extraction of U from ores generally involves leaching with sulfuric acid (H 2 SO 4 ). The effluent (termed raffinate or barren solution) and tailings from the mill are discharged ...

Microbial Leaching of Uranium Ore

201199 · Our authors and editors. We are a community of more than 103,000 authors and editors from 3,291 institutions spanning 160 countries, including Nobel Prize winners and …

Journal Papers

2  · The SAIMM is a professional institute with local and international links aimed at assisting members source information about technological developments in the mining, metallurgical and related sectors.

REVIEW Microbial Leaching of Uranium Ore

Key Words: Uranium, Microbial, Leaching, Nuclear, Pyrometal-lurgy, Refractory, Processing. INTRODUCTION This paper is a review of the microbiological leaching of uranium ores. Microbio-logical leaching has been use as an alterative approach to conventional hydrometal-lurgical methods of uranium''s extraction. In the microbiological leaching process,

uranium processing

Roasted uranium ores are leached of their uranium values by both acidic and alkaline aqueous solutions. For the successful operation of all leaching systems, uranium must either be initially present in the more stable hexavalent state or be oxidized to that state in the leaching process. Acid leaching is commonly performed by agitating an ore-leach mixture for 4 to as long as 48 …

Leaching of uranium ore

We claim: 1. A process for treating uranium ores containing uranium in oxide form and iron to solubilize uranium therein as UO 2 ++ and recover uranium therefrom which comprises slurrying particulate uranium ore containing uranium in oxide form in water, treating said slurry with sulfur dioxide and air at a ratio of about 9 to 1 to 5000 to 1 air to sulfur dioxide until a final pH at least …

IJERPH | Free Full-Text | Heterotrophic Bioleaching of …

20221017 · The microbial community analysis found that the abundance of Acidovorax, Delftia and Pseudomonas increased significantly during the leaching process, which reportedly contributed to bioleaching from metal ores. Our work laid a solid ground for the development of mixed-culture-based technology to recover vanadium from low-grade stone coal.

Bacterial leaching of waste uranium materials

The effect of ferrobacteria and thiobacteria on the leaching of waste uranium materials from which 70-80% of uranium was previously leached by classical chemical hydrometallurgical procedure has been investigated. The bacteria used are found in the ore and the mine water of Zletovska River locality, Yugoslavia.

microbial leaching of uranium ore

Uranium Bioleaching MINTEK MINTEK. It was found that the low temperature of the bioleaching process,which was restricted to 35 °C,resulted in such slow uranium extraction rate

(PDF) Microbial leaching of uranium and other trace …

2004101 · P. fluorescens grown with ore caused a change in pH in the growth medium from 4.7 to 9.3, which was significantly higher than for the other two species, for which pH was …

Microbiological leaching of uranium ores | SpringerLink

1999111 · Microbiological leaching has been used as an alternative approach to conventional hydrometallurgical methods of uranium extraction. In the microbiological leaching …

Gold Dissolution from Ore with Iodide-Oxidising Bacteria

2019312 · An experiment on cyanide leaching of finely disseminated gold ore (104 µm grain size, pH ≥ 10.5) indicated that higher gold dissolution (97.5%) occurred after about 40 hours of leaching time 39.