Microbial Leaching of Uranium Ore Hadi Hamidian Islamic Azad University, Qaemshahr Branch Iran 1. Introduction 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.
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 ...
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Uranium leaching: Although less uranium than copper is obtained by microbial leaching, the uranium process is more significant economically. Because a thousand tons of uranium ore must be handled to obtain one ton of uranium, in-situ microbial leaching is gaining greater acceptance, since it eliminates the expense of moving such vast amounts of ...
01-07-1993· 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 heap leaching.
Vol. 21, No. 8 (2009) Microbial Leaching of Uranium Ore 5809. Harrison et al.9 reported the role of the iron oxidizing Acidithiobacillus ferrooxidans in leaching of uranium. The uranium ore was stacked in heaps, similar to dump leaching of low-grade copper ore and leached using an acidic ferric sulfate
Uranium bioleaching process is more significant economically. In situ microbial leaching is greater acceptance since it eliminates the expense of moving vast amounts of material. For instance thousand tons of uranium ore must be handled in other than bioleaching processes, to obtain one ton of uranium…
10-08-2020· 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.
Uranium-bearing ore This reaction requires a source of iron and a high redox potential. In practice, the iron is usually obtained from pyrite – which is either associated with or added to the ore, and a high redox potential is achieved by adding oxidising agents such as pyrolusite (MnO 2 …
4 Principles of Microbial Metal Leaching 194 4.1 Leaching Mechanisms 194 4.2 Models of Leaching Mechanisms 194 4.3 Factors Influencing Bioleaching 197 4.4 Bacterial Attachment on Mineral Surfaces 200 5 Microbial Diversity in Bioleaching Environments 200 6 Case Studies of Bioleaching Applications 208 6.1 Commercial-Scale Copper Ore Bioleaching 208
01-07-1993· F['MS MicroNology Reviews I1 (1993)237 242 c 1993 Federation of European Microbiological Societies (1168-6445/93/$15.1}1) Published by Elsevier 237 FEMSRE {)0282 Bacterial leaching of uranium ore from Figueira-PR, Brazil, at laboratory and pilot scale O. Garcia Jfinior l)el~artarncnto Bioqu[mica, Instituto de ()u[mica, UNESP.
Vol. 21, No. 8 (2009) Microbial Leaching of Uranium Ore 5809. Harrison et al.9 reported the role of the iron oxidizing Acidithiobacillus ferrooxidans in leaching of uranium. The uranium ore was stacked in heaps, similar to dump leaching of low-grade copper ore and leached using an acidic ferric sulfate
Uranium processing - Uranium processing - Leaching: 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 ...
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 Thiobacillus ferrooxidans This paper describes some of the laboratory techniques used to investigate the characteristics of the bacteria, and to utilize their properties in uranium leaching.
Microbial Leaching of Uranium from Low Grade Ore and Waste Sample of Northern Part of Gabal Gatter, Egypt Using Penicillium Purpurogenium and Pseudomonas Fluorescens SHA 281 1Shimaa S. Hussien*, Osman A. Desouky1 Said E. Mohamadeyand 1 1Nuclear Materials Authority, P.O. Box 530 El-Maadi, Cairo, Egypt. *Corresponding Author: Shimaa S. Hussien
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.By continuing to use our website, you are agreeing to our use of cookies.
Uranium bioleaching process is more significant economically. In situ microbial leaching is greater acceptance since it eliminates the expense of moving vast amounts of material. For instance thousand tons of uranium ore must be handled in other than bioleaching processes, to obtain one ton of uranium…
2. Uranium Leaching: This is an indirect process in which the microbes do not interact with uranium ore directly but act on iron oxidant. Ferric sulphate and sulphuric acid can be obtained by Thiobacillus ferrooxidans from the pyrite within the uranium ore. The reaction is given below: 2FeS 2 + H 2 O + 7.5O 2 → Fe 2 (SO 4) 3 + H 2 SO 4
Bosecker K., Wirth G. (1980) Bacterial Leaching of a Carbonate Bearing Uranium Ore. In: Biogeochemistry of Ancient and Modern Environments. Springer, Berlin, Heidelberg
In situ microbial leaching is greater acceptance since it eliminates the expense of moving vast amounts of material. For instance thousand tons of uranium ore must be handled in other than bioleaching processes, to obtain one ton of uranium. This is an indirect leaching process since the microbial attack is not on uranium ore directly but on ...
Vol. 21, No. 8 (2009) Microbial Leaching of Uranium Ore 5809. Harrison et al.9 reported the role of the iron oxidizing Acidithiobacillus ferrooxidans in leaching of uranium. The uranium ore was stacked in heaps, similar to dump leaching of low-grade copper ore and leached using an acidic ferric sulfate
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.By continuing to use our website, you are agreeing to our use of cookies.
Uranium processing - Uranium processing - Leaching: 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 ...
Microbial Leaching (Bioleaching, Biomining ... Uranium Leaching Uranium leaching is more important than copper, although less amount of uranium is obtained than copper. For getting one tonne of uranium, a thousand tonne of uranium ore must be handled. In situ uranium leaching …
2. Uranium Leaching: This is an indirect process in which the microbes do not interact with uranium ore directly but act on iron oxidant. Ferric sulphate and sulphuric acid can be obtained by Thiobacillus ferrooxidans from the pyrite within the uranium ore. The reaction is given below: 2FeS 2 + H 2 O + 7.5O 2 → Fe 2 (SO 4) 3 + H 2 SO 4
17-01-2006· (1993), Bacterial leaching of uranium ore from Figueira—PR, Brazil, at laboratory and pilot scale. FEMS Microbiology Reviews, 11: 237–242. …
Bosecker K., Wirth G. (1980) Bacterial Leaching of a Carbonate Bearing Uranium Ore. In: Biogeochemistry of Ancient and Modern Environments. Springer, Berlin, Heidelberg
But discovering a new ore body does not mean that mining will be feasible because several factors may influence the metal winning process, e.g. low amount of total ore, low concentration of valuable metal, large dissemination of ore.
Key Terms. ore leaching: The process of recovering metals from ores by using a number of different techniques.; Microbial ore leaching (bioleaching) is the process of extracting metals from ores with the use of microorganisms. This method is used to recover many different precious metals like copper, lead, zinc, gold, silver, and nickel.
In microbial leaching (bioleaching), metals can be extracted from large quantities of low grade ores. Although recovery of metals ... Pseudomonas aeruginosa can be employed in mining low grade uranium (0.02%) ore. This organism has been shown to accumulate about 100 mg uranium per one liter solution in less than ten seconds.
