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According to the effect of ferric ion on uranium bioleaching, it can be concluded that the acidic ferric sulfate is a strong and effective oxidizing agent, which could replace environmentally undesirable MnO2 as an oxidant in leaching circuits [1, 4, 7]. In this study, bioleaching of low grade uranium ore of
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 reaction. Microorganisms in the bioleaching process oxidize ferrous iron to the ferric form and thus regenerate ferric sulfate.
Bioleaching of uranium and copper has been widely commercialized. But large scale leaching process may cause environmental problems when dump is not managed properly. This results in seepage of leach fluids containing large quantity of metals and low pH …
During the heap bioleaching, uranium recovery increased from 64.10% in the acid pre-leaching stage to 90.40% in the bioleaching stage. In the late stage of the heap bioleaching (after 70 days), the uranium concentration in the leachate was < 100 mg/L (Fig. 12). It was possibly explained that some uranium particles may be embed in dense gangue
Mar 09, 2010· 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
Uranium bioleaching in columns was also investigated by Muň oz et al. (1995b) for the Spanish uranium ore (0.087% U 3 O 8 ) with 60% uranium recovery.The study of microbial ecology in bioleaching environment can estimate the interaction of phylogenetic microbial groups in the 0960-8524/$ -see front matter Ó 2011 Elsevier Ltd.
A technology that has not been considered thus far is the tank bioleaching of uranium concentrates. In the 1990s, Mintek undertook extensive research into the bioleaching of typical Witwatersrand uranium- and gold-bearing ores and concentrates.
The bioleaching of uranium from Turamdih ore was carried out in the 2L bioreactor using enriched (adapted) culture of A.ferrooxidans. The conditions maintained during the bioleaching at pH 2.0 were: 20% (w/v) pulp density, 35°C, 150rpm using ore particles of <76p.m
Jul 01, 1993· The bioleaching of a low-grade uranium ore in shaker and columns using natural, pure and mixed cultures has been studied. Initially, a chemical and microscopical characterization of the mineral was carried out. Orbital shaker experiments were performed to quickly obtain the best bacterial leaching conditions.
Uranium; Zinc; Nickel; How does the bioleaching process work? There are many types of bioleaching processes, and copper is the most common. A few of the most popular types of bioleaching extract metals from ore by retrieving sulfide minerals using bacteria …
Aug 28, 2020· World J Mic Biotech. Microbial leaching of uranium and other trace elements from shale mine tailings at Ranstad. A study of the bioleaching of a Spanish uranium ore. There was a problem providing the content you requested. A review of the bacterial leaching in the treatment of uranium ores. A study of the bioleaching of spanish uranium ore.
Sep 28, 2015· Bioleaching of Uranium: Bioleaching is the method of choice for the large-scale production uranium from its ores. Uranium bioleaching is widely used in India, USA, Canada and several other countries. It is possible to recover uranium from low grade ores (0.01 to 0.5% uranium) and low grade nuclear wastes. In situ bioleaching technique is
Jun 01, 2020· Bioleaching is a phenomenon in which micro-organisms are used to extract metals from their ores and minerals by solubilization, also known as biomining. uranium etc. CONCLUSION: Varying the physiochemical and chemical properties of ores and microbes, the environment can be changed as the same is for metal extraction.
The bioleaching of uranium achieved a maximum extraction of 75±15 % w/w after 55 days. In this study an attempt was made to demonstrate the relationship between the shrinking-core model and the experimental data by plotting the fractional conversion of uranium against time.
Tailings from inactive uranium mine sites represent a potential secondary source of rare earth elements (REEs). For this study, two mine tailings (DT and RAT) from restored uranium sites in Ontario, Canada, were used. Bioleaching experiments were conducted with a mix of native sulfur- and iron-oxidizing bacteria to test the solubilization of REEs, U and Th at different temperatures (20, 30 and
Jul 01, 1997· 6.2 Uranium. Commercial application of bioleaching of uranium from low-grade ores has been practised since the 1960s . Best known are the in situ leaching operations in the underground uranium mines in the Elliot Lake district of Canada including the Stanrock, Milliken and Denison mines.
The influences of several chemical parameters on uranium extraction in column reactor were also investigated. A uranium recovery of 96.82% was achieved in 97 days column leaching process including 33 days acid pre-leaching stage and 64 days bioleaching stage. It was reflected that indirect leaching mechanism took precedence over direct.
May 28, 2019· Another industrially applied hydrometallurgical process fo r uranium is bioleaching [18–22]. An . advantage of bioleaching is that iron-oxidizing bacteria can …
Jan 03, 2021· Different microorganisms have been studied for bioleaching of uranium ores. Among these microorganisms, fungi, especially genus Aspergillus, were found to be effective in extracting uranium and other valuable metals from their ores using an effective, cheap and eco-friendly method [ …
uranium bioleaching in the early 1950s was taken to prevent solubilization, but it soon became apparent that this process could be applied for a commercial scale to extract uranium for low-grade ores. During 1952 and 1953, the plant at Urgeirica started a uranium …
Bioleaching of Uranium: Bioleaching is the method of choice for the large-scale production uranium from its ores. Uranium bioleaching is widely used in India, USA, Canada and several other countries. It is possible to recover uranium from low grade ores (0.01 to 0.5% uranium) and low grade nuclear wastes. In situ bioleaching technique is
Jan 03, 2021· Factors Affecting U-Bioleaching Using Cell Metabolites. The effect of pH (2 to 12), shaking speed (120 to 200 rpm) of both the culturing and bioleaching steps, rock particle size (< 63 to > 700 µm) and pulp density (1 to 10% PD) on U-bioleaching using culture filtrate of A. niveus (isolate FII-5) was studied using indirect method.. Recovery of Uranium from Leach Liquor
The column chemical leaching and bioleaching methods recovery of uranium from one uranium ore containing brannerite under the some conditons were investigated. The brannerite ore sample taken from one uranium mine in southern China, the ore particle size was crushed to -5mm, the uranium content is 0.281%. The leaching duration lasted 120 days, the acid consumption rate were 7.82% and 7.79% by
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 concentration as source of energy.
Abstract: The bioleaching of a low-grade uranium ore in shaker and columns using natural, pure and mixed cultures has been studied. Initially, a chemical and microscopical characterization of the m
bioleaching in Egypt. The amount of uranium solubilized by A. terreus and P. spinulosum was increased by intensifying ore concentrations on the growth media, reaching its maximum at 4 % (w/v). Whereas, the highest percentage of uranium released by both fungi was obtained at 1 % (w/v), in this concentr ation the released uranium being 75 and 81.5%
Jan 01, 2011· Industrial-scale bioleaching of uranium is carried out by spraying stope walls with acid mine drainage and the in-situ irrigation of fractured underground ore deposits.
Bioleaching of uranium in Indian scenario With the detection of uranium first ever at Jaduguda (quartz-chlorite-biotite-schist type) in 1951, the first uranium processing plant was commissioned in 1967 at the site. Different mining methods and leaching techniques were studied to find the most suitable
The goal of the present work was to perform bioleaching of uranium from low grade ore from Vostok deposit (Republic of Kazakhstan), which was previously subjected to long-term acid leaching. 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, and uranium
Bioleaching uranium minerals Bioleaching of uranium from natural sources was applied to uranium-bearing ores from Daejeon and Okchen districts of South Korea (Choi et al., 2005). The quantity of uranium in these ores is estimated to be over 100 million megagrams. The average content of U 3 O 8 in these deposits is below 0.1% by weight.
Bioleaching of uranium was carried out with Epicoccum nigrum isolated from El-Sella ore material. El-Sella area is located in the southern eastern desert of Egypt. The maximum bioleaching of U(VI) was found to be 76.6 % at these optimum conditions: 9 days incubation period, 0.5% pulp density, 30 °C incubation temperature at shaking speed 175 rpm.
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
The uranium extration rate of bioleaching column reached 72% in 38 days, using bioleaching have obvious advantages compare to conventional acid leaching (65%). Open Access This is an open access article distributed under the CC BY-NC license .