·The bioleaching of a low grade uranium ore in shaker and columns using natural pure and mixed cultures has been studied and it is shown that temperature pH and type of inoculum are the most important variables inBioleaching The bioleaching of a low grade uranium ore in shaker and columns using natural pure and mixed cultures has been studied Initially a
·In the model ecological system of bioleaching it is increasingly being recognized that microbial community composition plays a critical role in determining the leaching process rates Rawlings and Johnson 2007 Yin et al 2019 Zhou et al 2019 The relatively small number of dominant strains as a common characteristic emerged from the related studies
·Microbial Leaching of Uranium from Low Grade Ore and Waste Sample of Northern Part of Gabal Gatter Egypt Using Penicillium Purpurogenium and Pseudomonas Fluorescens Compared with P fluorescens SHA 281 and P purpurogenium this fungus has four advantages in the leaching of uranium ore [7] Firstly chemoorganoheterotrophic fungi can
·Bioreactor leaching using enriched culture of Acidithiobacillus ferrooxidans and Leptosprillium ferrooxidans was investigated for the apatite rich Indian Narwapahar uranium ore Bioreactor leaching of Narwapahar ore of <45 μm size at pH and 10% w/v PD using 10% v/v inoculum of the bacterium at 35 °C A ferrooxidans and 40 °C L ferrooxidans
·Native microorganisms were isolated from water samples collected from uranium mines of Jaduguda Bhatin and Nawapahar of UCIL India Ten fungal strains isolated in pure cultures were selected identified and used in this study The strains were used for in situ leaching of mainly oxide low grade uranium ore of Turamdih mine The maximum recovery of 71%
·Therefore a proper amount of pyrite in uranium ore is critical for microbial leaching of uranium [16 33] When the content of pyrite in uranium ore is very low less than % it is not
·The investigated samples proved that the optimum conditions of uranium leaching are 7 days incubation time for ore and 8 for waste 3% pulp density 30 oC incubation temperature and pH 4
Recent advances from genetic engineering applied to bioleaching microorganisms will allow in the future to better understand important aspects of their physiology as well as to open new possibilities for synthetic biology applications of leaching microbial consortia Key points • Leaching of metal sulfides is strongly enhanced by microorganisms
·The biogeochemistry of the acid leaching of a non sulfidic weathered uranium ore from Ranger Mine Australia in relation to varied iron concentrations and Fe III /Fe II ratios was examined in this work Controlled column studies which simulate a heap leaching process showed rapid uranium leaching during the initial stages of operation This was thought to be a
·The sample was kept in the media in 250 ml glass bulbs that contained 100 ml of the medium and 10 wt% of ore particles at 25 ± °C without stirring for 50 days; 2 microbial leaching of the CAS sample using enriched cultures that were obtained from cultivating the CAS sample in PW and PW30 media at a temperature of 25 ± °C without
·Native microorganisms were isolated from water samples collected from uranium mines of Jaduguda Bhatin and Nawapahar of UCIL India Ten fungal strains isolated in pure cultures were selected identified and used in this study The strains were used for in situ leaching of mainly oxide low grade uranium ore of Turamdih mine The maximum recovery of 71%
·The sample was kept in the media in 250 ml glass bulbs that contained 100 ml of the medium and 10 wt% of ore particles at 25 ± °C without stirring for 50 days; 2 microbial leaching of the CAS sample using enriched cultures that were obtained from cultivating the CAS sample in PW and PW30 media at a temperature of 25 ± °C without
·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
·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 and % respectively Uranium U is one of the strategic elements and essential for many applications as a fuel in nuclear power plants and nuclear
6 ·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
·Citric acid and oxalic acid the main metabolites of fungi have different leaching effects on uranium ore Herein uranium leaching from a volcano litho type uranium ore using citric acid and oxalic acid was studied by performing soaking experiments in incubator shakers using pure water and H2SO4 as controls The citric acid is advantageous over oxalic acid in terms of
·The continuous rise of the population cum standard of living has resulted in Nigerians looking for a profound solution to the fast growing demand for electrical energy with sustainability concerns including greenhouse gas emissions limitation Thus the investigation of uranium leaching kinetics and thermodynamics has become one of the most crucial topics in
·Heap leaching is widely used to extract uranium in production Petersen 2016 Wang et al 2017 Kaksonen et al 2020 The challenge of surface heap leaching is to promote good contact and penetration of leaching solution with minerals McCready and Gould 1990 Generally the smaller the mineral particle size the higher the uranium extraction
·NISL uranium mining involves injecting CO 2 and O 2 into the ore bearing aquifers of stone type uranium deposits with O 2 being employed to oxidize U 4 hard to migrate into easy to migrate U 6 which can form movable U 6 carbonate complexes via complexation reactions with HCO 3 − Unlike acid ISL AISL uranium mining that employs
Abstract The pollutants produced by in situ leaching of uranium ore pose a hazard to groundwater resources through osmotic migration which has significantly restricted the development of this leaching method Microbial cementation can effectively reduce the permeability of sandstone uranium ore and prevent the pollutants migrating into the
Semantic Scholar extracted view of "Microbial recovery of uranium using native fungal strains" by A Mishra et al ABSTRACT High grade uranium granite ore was subjected to the biometallurgical and classical treatment to compare the uranium recovery Microbial leaching of uranium and other trace elements from shale mine tailings at Ranstad
·But discovering a new ore body does not mean that mining will be feasible because several factors may influence the metal winning process low amount of total ore low concentration of valuable metal large dissemination of ore
·The microbial leaching process is typically divided into two stages 1 the pre leaching stage where the ore rich in alkaline substances is treated with acid to create a suitable leaching environment for microbial uranium extraction and 2 the bioleaching stage where microorganisms oxidize Fe 2 to facilitate uranium dissolution
·The microbiological and chemical reactions in the production of leach liquors and in the leaching of uranium ore materials are presented Microbiological factors are evaluated for dump and heap
·That is to say the bacterial leaching of uranium ores is a two step process the bacterial leaching of pyrite and the leaching of the uranium ore with the resulting metabolic products of the pyrite biological attack In this way the dissolution of the uranium bearing ores can take place if the pyrite is attacked first 4
