bacterial leaching of low grade ores

  • Bacterial leaching of ores and other materials

    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, leaching in suspension.

  • extracting gold from ore using bacteria

    Extraction by Bacteria Leaching 860 Words 123 Help Me. Extraction by Bacteria Leaching Copper and Gold can be extracted from their ores by using bacteria leaching. A long time ago, engineers investigating the possibility of reopening the Roman workings noticed a blue-green liquid running from the mountains of excavated rock.

  • Review Article Exploitation of Bacterial Activities in ...

    bacterial leaching processes are faster than chemical pro-cesses at ambient temperature and atmospheric pressure. So far, only three di erent types of commercial scale microbi-ological leaching techniques are practiced for the recovery of copper and uranium from low-grade ores, namely, dump leaching, heap leaching, and insitu leaching. Knowledge

  • Bioleaching of chalcopyrite

    of low-grade copper ores has been briefly studied. The results show that the rate of copper dissolution has a positive relationship with bacterial growth, particularly with respect to bacterial attachment, which has an important role based on adsorption isotherm and scanning electron microscopy studies.

  • Environmentally Benign Bio-Leaching Extraction of Rare ...

     · Acidophilic bacteria has been are used for bio-leaching of Au/Cu/Ni from low grade ores industrial scale. Studies on bioleaching of REEs from red mud (Al 2 O 3 ) using Penicillium tricolor and Aspergillus niger (An), and, of bio-leaching (lab-scale) of phosphate rocks using Acidithiobacillus ferrooxidans (Af) have been reported [ 6, 7 ].

  • How is leaching carried out in case of low grade copper ores?

    In case of low grade copper ores, leaching is carried out using acid or bacteria in the presence of air. In this process, copper goes into the solution as Cu 2+ ions.. The resulting solution is treated with scrap iron or H 2 to get metallic copper.

  • Bacterial Leaching

    Why Bacterial Leaching Worldwide reserves of high-grade ores are diminishing at an alarming rate due to the rapid increase in the demand for metals. However there exist large stockpiles of low and lean grade ores yet to be mined. The problem is that the recovery of metals from low and lean grade ores using conventional techniques is very

  • Microbial Leaching of Uranium Ore

    extract uranium for low-grade ores. During 1952 and 1953, the plant at Urgeirica started a uranium heap leaching process on a commercial scale. This is an early turning point in the microbiological leaching of uranium ores. Harrison et al. (1966) reported the role of th e iron oxidizing Acidithiobacillus ferrooxidans in leaching of uranium.

  • NEW LEACH TESTS SHOW POTENTIAL FOR HIGH CU …

    BioHeap has developed a patented bacterial heap leaching process BioHeap™ which leaches low grade sulphide ores using adapted proprietary bacterial cultures. During 1999 to 2001 BioHeap™ was successfully trialled at the Radio Hill Mine in the Pilbara region of Western Australia.

  • BACTERIAL LEACHING OF LOW GRADE NICKEL LATERITES …

    Bacterial leaching using chemolithotrophic microorganisms Bacterial leaching using chemolithotrophic microorganisms is a well established phenomenon With the addition of appropriate substrate such as elemental sulphur or pyrite, bacteria can indirectly dissolve nickel from the complex ore Mixed culture of chemolithotrophic bacteria…

  • Hydrometallurgical Processing of Low-Grade Sulfide Ore and ...

    Abstract. The authors describe the opportunities of low-grade sulfide ores and mine waste processing with heap and bacterial leaching methods. By the example of gold and silver ores, we analyzed specific issues and processing technologies for heap leaching intensification in severe climatic conditions.

  • A BACTERIAL HEAP LEACHING APPROACH FOR THE …

    A BACTERIAL HEAP LEACHING APPROACH FOR THE TREATMENT OF LOW GRADE PRIMARY COPPER SULPHIDE ORE SW Robertson, A Vercuil, PJ van Staden and P Craven MINTEK ABSTRACT Mintek is currently developing a design approach for the heap leaching of low-grade primary copper sulphide material. Since the leaching of chalcopyrite requires elevated

  • (DOC) bacteria leaching | Syahid Hidayatullah

    Hydrometallurgy usually use for extract low grade ores. One of method for extract ores by hydrometallurgy is bacteria leaching. Bacteria leaching is process to extract ores from minerals by using microorganism to accelerate the process. A. Historical Background One of the first reports where leaching might have been involved in the mobilization ...

  • Microbes and mineral recovery: Bioleaching of copper, gold ...

    As the high -grade deposits of certain metals are being depleted, there is a pressing need to find innovative and economical procedure to recover metals from low grade deposits. There is urgent need to develop alternate technologies to recover metals from low grade ores and minerals. Microorganisms can play an important role in meeting some of

  • Percolation Leaching of a Chalcopyrite-Bearing Ore at ...

    Dump or heap leaching of copper ores is an important supplement to open pit mine production of copper and provides about 11 pct of the total copper recovered in the United States (13).3 Chalcopyritic ores comprise the largest portion of these low-grade ores and are the most difficult to leach. Modern dump leaching

  • Chalcopyrite Leaching by Thermophilic Bacteria

     · In the Series I tests conducted in 1977-78 all six leach columns contained a low-grade ore from the Pinto Valley Mine, Cities Services Corp., Arizona. Chalcopyrite was the primary copper mineral with some covellite and chalcocite present. Pyrite was abundant in this ore. This low-grade ore was sized and loaded into six leach columns:

  • Effects of ore mineralogy on the microbial leaching of low ...

    Effects of ore mineralogy on the microbial leaching of low grade complex sulphide ores P.A. Olubambia,b,⁎, S. Ndlovua, J.H. Potgietera, J.O. Borodeb a School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private bag 3, WITS 2050, Johannesburg, South Africa b Department of Metallurgical and Materials Engineering, Federal University of Technology, PMB 704, …

  • Microbial ore leaching in developing countries

    in bacterial leaching of sulfides. Native strains have been isolated, characterized and evaluated for their activity in the treatment of sulfide ores s India India has shown interest in bacterial leaching of copper from low-grade ores and dumps. At the M.A.C.S. Research Institute, Pune, ores from the

  • economical evaluation of heap leaching and cil

    proposed Heap Leach and CIL/P hybrid processing operation. A further positive complication in assessing a combined Heap Leach and CIL/P operation is the influence it has on the mining shell and thus project economics. When profit is added by the processing of low-grade ore, which if mined from within a proposed pit shell is

  • Why do we extract copper from low grade ores?

     · Bacteria feed on the low grade metal ores and form a solution of copper ions, called a leachate. Slow process - it can take years to extract 50% of the metal from a low grade ore.Energy is needed in the elctrolysis step. Then, the copper will be extracted from the leachate by electrolysis or …

  • Column bioleaching of low-grade mining ore containing high ...

     · Mineral characteristics. The low-grade sulfide ore used in the column bioleaching test was obtained from Daye, Hubei province of China. Mineralogical analysis of the ore sample showed the presence of main sulfide minerals as 8.2% bornite, 0.3% Pentlandite, 0.8% chalcocite, 0.8% linnaeite, 0.3% wurtzite and 0.3% sphalerite.

  • Silver-catalyzed bioleaching of low-grade copper ores ...

    with low [Fe3+] in the presence of bacteria. The leaching of copper from the low-grade copper ore can be very effectively enhanced with silver and mesophilic microorganisms. For that system, the onset of oxidizing conditions starts at an Eh value slightly higher

  • Bacterial Leaching

    Bacterial leaching is an established method of treating refractory gold and base metal ores or concentrates. SGS Minerals Services has undertaken testing for numerous projects for flowsheet ... layer leaching of low-grade flotation concentrates. A binding agent is used

  • Bacterial Leach | SGS

    Bacterial leaching offers a number of advantages over cyanide and other leaching processes including: Suitability for refractory and low grade ores; Cost-effectiveness; Safe, simple, proven technology; Bacterial oxidation takes place at ambient pressure and temperatures from 15 degrees Celsius and up

  • LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY …

    the ore with the time of exploitation at the RTB mines [9] Oxide copper ore, mixed oxide-sulphide ores and low-grade copper sulphide ore, which, for economic reasons, cannot be enriched by flotation, may be processed by leaching methods. Agents for leaching copper can …

  • Bacterial and chemical leaching of copper-containing ores ...

     · This investigation compares bacterial leaching to chemical leaching to solubilize copper from a copper containing ore of the new site Northern Qarashoshaq in Zhylandy (Kazakhstan) which is currently under commercial development. From ICP-OES analysis, the bulk ore sample contains 1.5% of Cu and a trace level at 0.0024% of Ag. Phase analysis shows the main copper containing minerals are ...

  • Microbial Leaching of Uranium from Low Grade Ore and Waste ...

     · Microbiological leaching has been used as an alternative approach to conventional hydrometallurgical methods of uranium''s recovery from low grade ores and waste samples Penicillium purpurogenium and Pseudomonas fluorescens SHA 281 were exhibited a good potential in generating varieties of organic acids effective for bioleaching uranium.

  • Gold Dissolution from Ore with Iodide-Oxidising Bacteria

     · Bioleaching has been successfully applied in the commercial extraction of valuable metals such as copper 12 – 17, uranium 18, 19 and zinc 20 from low-grade ores. Biooxidation has been used as a pre-treatment to dissolve sulphide minerals from refractory gold ores before cyanide leaching 21 …

  • (PDF) Bacterial leaching kinetics for copper dissolution ...

    Bacterial leaching kinetics for copper dissolution from a low- grade Indian chalcopyrite ore. Dr Abhilash. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER. Bacterial leaching kinetics for copper dissolution from a low- grade Indian chalcopyrite ore.

  • Biomining

    Using Bacteria such as Acidithiobacillus ferrooxidans to leach copper from mine tailings has improved recovery rates and reduced operating costs. Moreover, it permits extraction from low grade ores - an important consideration in the face of the depletion of high grade ores.

  • Bacteria Leaching Low Grade Ores

     · Bacteria Leaching Low Grade Ores. USING BACTERIA to leach and recover a metal from any metallurgical raw material with a ferric sulphate sulphuric acid lixiviant has been patented by Kennecott. Kennecott Copper Corp. just recently obtained a U.S. patent on bacteria leaching of ores containing sulphides and/or iron sulphate.

  • A conceptual flowsheet for heap leaching of platinum group ...

    Successful industrial scale Ni-Cu bacterial heap leaching of ore has only recently been implemented at Talvivaara in Finland (Riekkola-Vanhanen, 2010), whilst Jinchuan Nickel company has also piloted Ni-Cu heap bioleaching of low-grade ore using mesophiles (Qin et al., 2009).

  • Methods of Metal Recovery by Microorganisms (2 Methods)

    In microbial leaching (bioleaching), metals can be extracted from large quantities of low grade ores. Although recovery of metals (e.g. copper) from the drainage water of mines has been known for centuries, the involvement of microbes in this process was recognized about 40 years ago.

  • Microbial Leaching of Uranium from Low Grade Ore and …

     · uranium from low-grade ore was collected from Radoniow''s ''small'' dump, Poland using the bioleaching of uranium achieved a maximum extraction of 75±15 % w/w after 55 days by Acidiothiobacillus bacteria. Compared with P. fluorescens SHA 281 and P. purpurogenium this fungus has four advantages in the leaching of uranium ore [7]. Firstly ...

  • Biological and chemical processing of low-grade manganese ores

     · J I0 2O Twine, days Fig.2 Iron dissolution during the aqueous SO2 leaching of manganese ore (experimental conditions as in Fig. l) Processing of low-grade manganese ores 313 50 45 40 35 30 25 20 15 10 Fig.3 X-ray diffraction spectra of the leach residue of the manganese ore (oh gypsum; 13, K-feldspar; % phyllo-silicate) Biological processing ...

  • Modeling the role of bacteria in leaching of low-grade ores

     · A robustious structural model is developed to describe the role of bacteria in the leaching process of low-grade ores under conditions controlled by intraparticle diffusion. The main impetus behind developing this model is to provide an insight into such systems, together with a …

  • Hydrometallurgical Processing of Low-Grade Sulfide Ore and ...

    The authors describe the opportunities of low-grade sulfide ores and mine waste processing with heap and bacterial leaching methods. By the example of gold and silver ores, we analyzed specific issues and processing technologies for heap leaching intensification in severe climatic conditions. The paper presents perspectives for heap leaching of sulfide and mixed ores from the Udokan (Russia ...

  • Microbiological Mining

    The central role of bacteria in the leaching of copper from low-grade ore long went unrecognised. The minerals industry now stands to gain from the application of novel methods of microbiological technology . by Corale L. Brierley (Published in: Scientific American, 247, 42 - …

  • Hydrometallurgical Processing of Low-Grade Sulfide Ore and ...

    Abstract: The authors describe the opportunities of low-grade sulfide ores and mine waste processing with heap and bacterial leaching methods. By the example of gold and silver ores, we analyzed specific issues and processing technologies for heap leaching intensification in …

  • EXTRACTION OF METALS FROM ORES BY BACTERIAL LEACHING ...

     · Exploitation of bacterial leaching enables the recovery of uranium from low grade ores (0.01–0.05% U 3 O 8), uneconomic to process by other means. The process can probably be applied to even poorer ores or of course to high grade material, such …

  • BACTERIAL LEACHING OF COPPER FROM LOW GRADE …

    Bacterial leaching Without the bacterium ~ (Control) S71 ~ With the boc.teriu FIG. 1. Effect of the growth of Tlziobacillus sp. on the pH of the Ireoium. Treatment of Low Grade Chalocopyrite Ore and Extraction of Copper

  • Assessment of ''Bacterial (Acidic)-Leaching'' of Rare Earth ...

     · Bioleaching methods are environmentally benign and economical options for extraction of rare earth elements (REEs) from low grade REE ores. We conducted shake-flask and column bio-leaching (Acidithiobacillus ferrooxidans) studies with a low grade phosphate ore constituting REEs, fluorapatite, and silicates. In shake-flask studies, the leaching rate relied mostly on the bacterial …

  • Bacterial consortium for copper extraction from sulphide ...

    The mining industry is looking forward for bacterial consortia for economic extraction of copper from low-grade ores. The main objective was to determine an optimal bacterial consortium from several bacterial strains to obtain copper from the leach of chalcopyrite. The major native bacterial species involved in the bioleaching of sulphide ore ...

  • Percolation bacterial leaching of low-grade chalcopyrite ...

    ode copper was produced through bacterial leaching of agglomer-ated ore in heaps [4,5]. Renman et al. [6] described step by step pro-gress made in setting up and operating bacterial heap leaching facili-ties to produce 300 to 10,000t/year of cathode copper in the Zijins-han copper mine in China. In the bioleaching process, leaching studies