• Acid and ferric sulfate bioleaching of uranium ores: A ...

    Author: Anna H. Kaksonen, Anna H. Kaksonen, Aino-Maija Lakaniemi, Olli H. Tuovinen
  • Uranium Bioleaching - MINTEK MINTEK

    Uranium-bearing ore. This reaction requires a source of iron and a high redox potential. In practice, the iron is usually obtained from pyrite ... In the 1990s, Mintek undertook extensive research into the bioleaching of typical Witwatersrand uranium- and gold-bearing ores and concentrates. It was found that the low temperature of the ...

  • Microbial Leaching of Uranium Ore - IntechOpen

    2018-9-25  recover uranium and copper values. Hefnawy (2001) used fungi for Aloga uranium ore 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

  • Bioleaching of a Spanish uranium ore - ScienceDirect

    Cited by: 20
  • Role of ferric ions in bioleaching of uranium from low ...

    Cited by: 12
  • Bioleaching - An Alternate Uranium Ore Processing ...

    Cited by: 19
  • Comparative Performance of Uranium Bioleaching

    Cited by: 11
  • A study of the bioleaching of a Spanish uranium ore.

    Cited by: 53
  • Continued Multicolumns Bioleaching for Low Grade

    Cited by: 4
  • A comparison of the uranium recovery from low-grade

    2016-12-27  A comparison of the uranium recovery from low-grade ore by bioleaching and acid leaching 137 Uranium ores in Poland contain about 250–1100 mg kg-1 U. Soils of Poland contain average amounts of U of 1.6 mg kg-1 (lowland) and up to >10 mg kg-1 in the mountain soils (Sudety Mountains).

  • Bioleaching of low-grade uranium ore using ...

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  • Bioleaching - An Alternate Uranium Ore Processing ...

    2017-1-17  3. Mechanism of Uranium Bioleaching There has been a long-standing debate as to whether the microbially assisted leaching of uranium ore is by direct or indirect mechanism. In the leaching of uranium, the bacteria do not directly attack the uranium mineral. But

  • bioleaching of uranium - Jack Higgins

    Mar 03, 2019 Uranium Bioleaching. However, the peak of 4th column is the highest one and that of the 3rd column is the second. This uranium ore belongs to a low grade type. Bioleaching of uranium was carried out with Turamdih ore sample procured from Uranium Corporation of India Limited, Jaduguda.

  • Uranium bioleaching from low-grade carbonaceous

    We evaluated the effectiveness of bioleaching uranium from a low-grade carbonaceous-siliceous-argillaceous type uranium ore using an indigenous iron-oxidizing bacteria, Acidithiobacillus ferrooxidans, isolated from local uranium ore. The effects of initial acidity, pulp density and ferrous ion concentration of the feed solution were investigated.

  • Sequential Bioleaching of Phosphorus and Uranium

    2019-5-31  Minerals 2019, 9, 331 3 of 11 Another industrially applied hydrometallurgical process for uranium is bioleaching [18–22]. An advantage of bioleaching is that iron-oxidizing bacteria can regenerate Fe3+ from Fe2+ using only oxygen (air) and protons (Equation (3)) [19,20,22].

  • Research Article Continued Multicolumns Bioleaching for ...

    2019-7-30  multicolumns bioleaching experiment, the uranium recovery ( . %) of th column is greater than those of other columns in days, as well as the acid consumption (.g/kg). ese results indicate that continued multicolumns bioleaching technology is suitable for leaching this type of ore. e uranium concentration of PLS can be e

  • Bioleaching - Wikipedia

    2020-6-6  Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt

  • Bioleaching Definition Process Anglo American

    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

  • Microbial Leaching (Bioleaching, Biomining ...

    However, uranium leaching from ore on a large scale is widely practiced in the USA, South Africa, Canada and India. Insoluble tetravalent uranium is oxidized with a hot H 2 SO 4 /Fe 3+ solution to make soluble hexavalent uranium sulfate at pH 1.5-3.5 and temperature 35°C (Crueger and Crueger, 1984).

  • What is Bioleaching? (with pictures) - wiseGEEK

    2020-5-24  S. Mithra Last Modified Date: 24 May 2020 . Bioleaching is the use of bacterial microorganisms to extract precious metals, such as gold, from ore in which it is embedded.As an alternative to smelting or roasting, miners use bioleaching when there are lower concentrations of metal in ore and they need an efficient, environmentally responsible method to extract it.

  • Bioleaching Definition Process Anglo American

    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

  • Bioleaching of Uranium Ore by a Novel Acidophilic ...

    This study examined bioleaching of uranium ore at different acid concentrations by a novel consortium culture combined with both mesophilic and moderately thermophilic acidophiles containing 4 species of bacteria and 1 species of fungus. Four plastic buckets were set up with uranium minerals at room temperature (about 27 -32°C) at different acid concentration (6g/l and 15g/l) for ...

  • Bioleaching of a Spanish uranium ore FEMS

    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. Afterwards, small columns were used ...

  • Bioleaching of Low Grade Uranium Ore of Saghand Mine

    2020-5-23  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

  • Sequential Bioleaching of Phosphorus and Uranium

    As this ore did not contain much uranium, an artificial fluorapatite-uranium ore was prepared by mixing standard uranium ore and fluorapatite. The research with this ore showed that 89% of uranium dissolved in 3 days at pH > 2 and leaching was improved by applying Fe3+ oxidant. In these conditions only 4% of phosphorus was leached.

  • Role of ferric ions in bioleaching of uranium from low ...

    2018-6-5  The bioleaching of uranium appeared to follow a chemical control kinetic model with the reaction of lixiviant, Fe(III) and acid on the surface of the solid in the temperature range 25–35°C. Phase identification by XRD and the study of surface morphology of the ore and the residue by SEM study corroborated the above mechanism of uranium leaching.

  • Bioleaching of Gold Ore Essay Example Graduateway

    Bioleaching has been applied to copper and uranium deposits for many years, but more recently has been applied to gold ore refractory and refractory concentrates. This process involves the oxidation of sulfide, ferrous, and sometimes carbon containing minerals in order to liberate the gold trapped within.

  • Fungal Leaching of Uranium from its Geological Ores in ...

    2015-6-18  biosorption of uranium byA. terreus andP. spinulosum during bioleaching process was evaluated (Table 6). The amount f o uranium absorbed by both fungal mycelium was also increased with increasing ore concentrations in the growth media. Since the amount of uranium released in the media decreased beyond the of uranium by growing fungal mycelia ...

  • Research Article Continued Multicolumns Bioleaching for ...

    2019-7-30  multicolumns bioleaching experiment, the uranium recovery ( . %) of th column is greater than those of other columns in days, as well as the acid consumption (.g/kg). ese results indicate that continued multicolumns bioleaching technology is suitable for leaching this type of ore. e uranium concentration of PLS can be e

  • Bioleaching - LinkedIn SlideShare

    Take part in bioleaching of copper oxide ore, uranium( extract100gm uranium per liter solution in 1o seconds). 15 Rhizopus arrhizus: This Microorganism can extract uranium from low grade uranium ores. 16. Aspergillus niger: It is fungi which extracts copper and nickel. Takes part in bioleaching

  • Bioleaching Definition Process Anglo American

    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

  • BIOLEACHING OF URANIUM PDF - physicselegant.me

    Bioleaching of low-grade uranium ore using Acidithiobacillus ferrooxidans. Table 1 shows the chemical and mineralogical composition of the sample. Plastic film was covered on the top of both leaching column and liquid collecting tank to reduce evaporation. In practice, the iron is usually obtained from pyrite — which is either associated with ...

  • Bioleaching of a Spanish uranium ore FEMS

    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. Afterwards, small columns were used ...

  • bioleaching of uranium - menuiseriefreson.be

    Bioleaching of UO22+ ions from a Romanian poor uranium ore. Abstract. The present paper deals with an experimental study on the bioleaching of a poor uranium ore by means of hydrophytic plants Lemna minor and Riccia fluitans, under various operating conditions.The maximum degree of bioleaching (42%) of the reduced uranium species to U(VI) has been attained for the ore-Lemna minor-alkaline ...

  • Bioleaching of Gold Ore Essay Example Graduateway

    Bioleaching has been applied to copper and uranium deposits for many years, but more recently has been applied to gold ore refractory and refractory concentrates. This process involves the oxidation of sulfide, ferrous, and sometimes carbon containing minerals in order to liberate the gold trapped within.

  • Role of ferric ions in bioleaching of uranium from low ...

    2018-6-5  The bioleaching of uranium appeared to follow a chemical control kinetic model with the reaction of lixiviant, Fe(III) and acid on the surface of the solid in the temperature range 25–35°C. Phase identification by XRD and the study of surface morphology of the ore and the residue by SEM study corroborated the above mechanism of uranium leaching.

  • Bioleaching - LinkedIn SlideShare

    Take part in bioleaching of copper oxide ore, uranium( extract100gm uranium per liter solution in 1o seconds). 15 Rhizopus arrhizus: This Microorganism can extract uranium from low grade uranium ores. 16. Aspergillus niger: It is fungi which extracts copper and nickel. Takes part in bioleaching

  • Bioleaching of Uranium From Egyptian Rocks Using

    2019-4-9  Bioleaching is an economic, novel practice for extraction of metals from their sources by microorganisms. The current study aimed to extract uranium from Egyptian ores using native strains of actinomycetes. Two types of rocks and one ore sample were collected from west-central Sinai, Egypt.

  • 8 Microbial Leaching of Metals - Wiley-VCH

    2004-4-15  air roasting of low-grade ore was conducted at the Rio Tinto mines. Efforts to establish bioleaching at the Rio Tinto mines had been undertaken in the begin-ning of the 1890s. Heaps (10 m in height) of low-grade ore (containing 0.75% Cu) were built and left for one to three years for “natu-ral” decomposition (SALKIELD, 1987). 20 to

  • uranium leaching trituradora yeso equipo

    Uranium mining is the process of extraction of uranium ore from the ground. The worldwide production of uranium in 2015 amounted to 60,496 tonnes. Kazakhstan, Canada, and Australia are the top three producers and together account for 70% of world uranium production.