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  • Recovery of precious metals from waste streams

    Recovery of precious metals from waste streams

    13/07/2017· Attia Y., and ElZeky M. 1989 Bioleaching of gold pyrite tailings with adapted bacteria. Hydrometallurgy 22: 291300. Awasthi A.K., Zeng X., and Li J. 2016 Integrated bioleaching of copper metal from waste printed circuit boarda comprehensive review of approaches and challenges. Environ Sci Pollut Res 23: 2114121156.

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  • Bioleaching Refractory Gold

    Bioleaching Refractory Gold

    The strain was previously adapted to grow in the iron free basal medium containing 1 wt of the concentrate, at 30°C. Bioleaching Gold in Stirred Reactor. A blank experiment to characterize bioleaching of the pyrite concentrate at 50 wt. pulp density in a conventional stirred reactor, was conducted. The bench scale stirred reactor was made of

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  • Bioleaching of gold pyrite tailings with adapted bacteria

    Bioleaching of gold pyrite tailings with adapted bacteria

    Bioleaching of gold pyrite tailings with adapted bacteria. Hy drometallurgy, 22: 291 300. Auriferous sulfide ores often contain very finely disseminated gold and other precious metal particles inside the sulfide crystals. The encapsulation of precious metal particles gives rise to the refractory nature of such ores to current extraction

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  • Bioleaching of Ultramafic Tailings by

    Bioleaching of Ultramafic Tailings by

    The tailings were sorted using an 8 mesh <2.36 mm sieve as were the chrysotile materials for the column experiments. Various amounts of either ground pyrite 4, 8, 10, 12, and 15 by weight or sulfidic tailings 15, 20, 25, 30, 35, and 40 by weightbined with chrysotile tailings for a total sample mass of 2.5 g. These mixtures were

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  • Attia, Y.A. and El Zeky, M. 1989 Bioleaching of Gold

    Attia, Y.A. and El Zeky, M. 1989 Bioleaching of Gold

    Attia, Y.A. and El Zeky, M. 1989 Bioleaching of Gold Pyrite Tailings with Adapted Bacteria. Hydrometallurgy, 22, 291 300.

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  • Continuous bioleaching of arsenopyrite from mine tailings

    Continuous bioleaching of arsenopyrite from mine tailings

    Continuous bioleaching of arsenopyrite from mine tailings using an adapted mesophilic microbial culture

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  • Bioleaching Test Procedure   Mineral Processing  Metallurgy

    Bioleaching Test Procedure Mineral Processing Metallurgy

    Pulps of 20 solids is prepared from 200 mesh pyrite concentrate after froth flotation, and is inoculated with 5 V/V of adapted bacterial solution. The bioleaching tests is carried out in 250 ml Erlenmayer flasks, each contained about 220 ml pulp. The pulps is aerated with air bubbling at one liter per minute air flow rate, and is continuously agitated with aic stirrer while the

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  • Bioleaching of Ultramafic Tailings by

    Bioleaching of Ultramafic Tailings by

    The tailings were sorted using an 8 mesh <2.36 mm sieve as were the chrysotile materials for the column experiments. Various amounts of either ground pyrite 4, 8, 10, 12, and 15 by weight or sulfidic tailings 15, 20, 25, 30, 35, and 40 by weightbined with chrysotile tailings for a total sample mass of 2.5 g. These mixtures were

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  • A Review on Alternative Gold Recovery Re agents to Cyanide

    A Review on Alternative Gold Recovery Re agents to Cyanide

    The importance of gold recovery from low grade ores and flotation tailings is continuously increasing due to raising gold demand and thereby high gold prices. However, due to raising social awareness of the ecological impacts of cyanidic gold extraction and environ mental specifications, the development and the implementation of alternative hydrometallurgical extraction processes have been a

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  • BIOLEACHING   BacTech

    BIOLEACHING BacTech

    Bioleaching, given access to a ready supply of iron, either internally generated or through the addition of pyrite from external tailings, can handle much higher levels of arsenic for neutralization. Bioleaching converts the arsenic present in the tailings into ferric arsenate, which is a stable and environmentally benign end product EPA.

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  • Bioleaching: Introduction, Methods, Application, Copper

    Bioleaching: Introduction, Methods, Application, Copper

    Bioleaching: Introduction, Methods, Application, Copper,anisms, and Processes! Introduction to Bioleaching: Leaching process was first observed in pumps and pipelines installed in mine pits containing acid water. This process was later on employed for recovering metals from ores containing low quantity of the metal. Presently certain metals from sulfide ores and other ores are

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  • Bioleaching of arsenopyrite from Janggun mine tailings

    Bioleaching of arsenopyrite from Janggun mine tailings

    Bioleaching of arsenopyrite from Janggun mine tailings South Korea using an adapted mixed mesophilic culture Article PDF Available in Hydrometallurgy 181 · August 2018 with 222 Reads

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  • Attia, Y.A. and El Zeky, M. 1989 Bioleaching of Gold

    Attia, Y.A. and El Zeky, M. 1989 Bioleaching of Gold

    Attia, Y.A. and El Zeky, M. 1989 Bioleaching of Gold Pyrite Tailings with Adapted Bacteria. Hydrometallurgy, 22, 291 300.

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  • Effect of bacterial adaptation and solution replacement on

    Effect of bacterial adaptation and solution replacement on

    Both bacterial adaptation and solution replacement increased the gold recovery by about 2 fold and that of silver by about 1.3 fold. In this work, more than 95 of the gold and more than 98 of the silver could be recovered from the sulfidic gold ore when bioleaching was used ahead of cyanidation, compared with 18.3 and 52.3 by direct

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  • Effect of bacterial adaptation and solution replacement on

    Effect of bacterial adaptation and solution replacement on

    Both bacterial adaptation and solution replacement increased the gold recovery by about 2 fold and that of silver by about 1.3 fold. In this work, more than 95 of the gold and more than 98 of the silver could be recovered from the sulfidic gold ore when bioleaching was used ahead of cyanidation, compared with 18.3 and 52.3 by direct

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  • Bioleaching of copper from samples of old flotation

    Bioleaching of copper from samples of old flotation

    old flotation tailings of the Copper Mine Bor, used from 1933 to 1987, contains about 27𴡂 tons of tailings with an average copper content in the range 0.20.3 wt. , a gold content of 0.30.6 g t1 and a silver content of 2.53 g t1.26 Hence, the best estimate of the total copper content in the old flotation tailings of

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  • Bioleaching of Pyrrhotite Tailings for Ni Extraction

    Bioleaching of Pyrrhotite Tailings for Ni Extraction

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  • Mechanism of enhanced bioleaching efficiency of    DeepDyve

    Mechanism of enhanced bioleaching efficiency of DeepDyve

    01/06/2008· Read Mechanism of enhanced bioleaching efficiency of Acidithiobacillus ferrooxidans after adaptation with chalcopyrite, Hydrometallurgy on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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  • Recovery of precious metals from waste streams

    Recovery of precious metals from waste streams

    13/07/2017· Attia Y., and ElZeky M. 1989 Bioleaching of gold pyrite tailings with adapted bacteria. Hydrometallurgy 22: 291300. Awasthi A.K., Zeng X., and Li J. 2016 Integrated bioleaching of copper metal from waste printed circuit boarda comprehensive review of approaches and challenges. Environ Sci Pollut Res 23: 2114121156.

    learn more

  • Bioleaching of arsenopyrite from Janggun mine tailings

    Bioleaching of arsenopyrite from Janggun mine tailings

    This article explores a heap bioleaching technology for the removal of arsenic As from mine tailings using the GEOCOAT technique. Small scale columns were operated at fixed temperatures of 20 °C, 30 °C, and 45 °C and at ramped up temperatures from 25 °C to 45 °C using a mixed mesophilic acidophilic iron and sulfur oxidizing microbial culture, adapted to high As concentration 20 g/L.

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  • PDF Biotechnology in gold processing   ResearchGate

    PDF Biotechnology in gold processing ResearchGate

    tailings with bioleaching before using standard extraction techniques such as cyanidation.Leadville gold ore tailings containing auriferous pyrite were first concentrated by

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  • Bioleaching of Gold Ore Essay Example  Graduateway

    Bioleaching of Gold Ore Essay Example Graduateway

    Major advances in bioleaching of gold ore were made when Newmont Mining Corporation began laboratory investigations of biooxidation in the late 1980s. By 1990 mass field pilots had begun on sulfur containing ore, investigating the effectiveness, as well as the economics involved in bioleaching of gold

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  • extracting gold from ore using bacteria

    extracting gold from ore using bacteria

    The extraction recovery of gold and silver using bioleaching ahead of cyanidation is a function of pyrite and other sulfides biooxidation. The higher the degree of oxidation of pyrite, the higher is the extraction recovery of gold and silver. Read More. What is the process of extracting copper using bacteria? Bioleaching is the process of extracting copper using bacteria. Click on this

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  • Valorisation of a flotation tailing by bioleaching and

    Valorisation of a flotation tailing by bioleaching and

    Bioleaching of gold pyrite tailings with adapted bacteria. August 1989 · Hydrometallurgy. Yosry Attia M. El Zeky Auriferous sulfide ores often contain very finely disseminated gold and other

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  • Bioleaching Refractory Gold Ore

    Bioleaching Refractory Gold Ore

    Bacterial extraction of gold from sulfide bearing ores has been studied by many investigators. If gold occurs finely disseminated within the sulfide ore matrix such as in pyrite, arsenopyrite and pyrrhotite, the leachant can notrate into the inside of solid ore in order to leach the enclosed submicron size gold

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  • Bacteria Leaching of Gold Encapsulated in Pyrite

    Bacteria Leaching of Gold Encapsulated in Pyrite

    From the figure it is clear that there was no initial lag period. This might be due to the adaptation of bacteria on a substrate of the pyrite tailings for 12 weeks before their use in bioleaching. The bioleaching of the pyrite was increased with treatment time, and it reached about 98 at the end of the test period of 28 days.

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  • Bioleaching Refractory Gold

    Bioleaching Refractory Gold

    The strain was previously adapted to grow in the iron free basal medium containing 1 wt of the concentrate, at 30°C. Bioleaching Gold in Stirred Reactor. A blank experiment to characterize bioleaching of the pyrite concentrate at 50 wt. pulp density in a conventional stirred reactor, was conducted. The bench scale stirred reactor was made of

    learn more

  • Fe Extraction from Cayeli Copper Ores by Bioleaching with

    Fe Extraction from Cayeli Copper Ores by Bioleaching with

    Introduction Bioleaching is a new technique used by the mining industry to extract minerals such as gold and copper from their ores while traditional extractions involve many expensive steps such as roasting and smelting, which requires sufficient concentrations of elements in ores .

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  • Bioleaching Preg Robbing Gold Ore

    Bioleaching Preg Robbing Gold Ore

    Refractory precious metal ores in which gold is encapsulated within iron sulfide minerals can be effectively treated by other leaching bacteria in addition to T. ferrooxidans. These include both facultative and obligate thermophiles. Use of thermophilic bacteria for microbial pretreatment of precious metal ores can offer economic advantagesmon bioleaching processes in terms of both

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  • Bioleaching of gold pyrite tailings with adapted bacteria

    Bioleaching of gold pyrite tailings with adapted bacteria

    Leadville gold ore tailings containing auriferous pyrite were first concentrated by froth flotation. The pyrite concentrate was treated for different periods of time with 12 weeks adapted Thiobacillus ferrooxidans before cyanide leaching. The bioleaching of the concentrate before cyanide leaching increased the gold extraction from 32 to 95 and

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  • Bioleaching: Introduction, Methods, Application, Copper

    Bioleaching: Introduction, Methods, Application, Copper

    Bioleaching: Introduction, Methods, Application, Copper,anisms, and Processes! Introduction to Bioleaching: Leaching process was first observed in pumps and pipelines installed in mine pits containing acid water. This process was later on employed for recovering metals from ores containing low quantity of the metal. Presently certain metals from sulfide ores and other ores are

    learn more

  • AUTOCLAVE TECHNOLOGY OF REFRACTORY GOLD BEARING

    AUTOCLAVE TECHNOLOGY OF REFRACTORY GOLD BEARING

    Bioleaching of gold pyrite tailings with adapted bacteria. August 1989 · Hydrometallurgy. Yosry Attia M. El Zeky Auriferous sulfide ores often contain very finely disseminated gold and other

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  • Gold  Copper Bioleaching

    Gold Copper Bioleaching

    Bacterial Leaching of Copper Ores Several types of bacteria capable of living in an acid environment have been isolated from copper mine waters. The foremost of these are of the genus Thiobacillus T.. Thiobacillus bacteria are acidophilic aerobic chemolithotrophs which grow most rapidly at a pH in the range of 2 3. T. ferrooxidans derive their energy by oxidizing ferrous iron, elemental

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  • Bioleaching of Gold Ore Essay Example  Graduateway

    Bioleaching of Gold Ore Essay Example Graduateway

    Major advances in bioleaching of gold ore were made when Newmont Mining Corporation began laboratory investigations of biooxidation in the late 1980s. By 1990 mass field pilots had begun on sulfur containing ore, investigating the effectiveness, as well as the economics involved in bioleaching of gold

    learn more

  • Bioleaching

    Bioleaching

    Bioleaching is the extraction of metals from their ores through the use ofanisms.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

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  • Bioleaching of Gold Ore Essay   3062 Words

    Bioleaching of Gold Ore Essay 3062 Words

    02/11/2009· Bioleaching of gold can be performed using a number of different techniques and various microbes depending on the factors of the operation in question. These bacteria need to be cultivated and adapted to achieve maximal results. The liberation of the metal by use of bacteria involvesplex chemistry. Optimization of these reactions involves a number of factors. Bioleaching technology is

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  • Bioleaching of Arsenic Rich Gold Concentrates by Bacterial

    Bioleaching of Arsenic Rich Gold Concentrates by Bacterial

    Many studies on mutation breeding of bioleaching bacteria have been done all over the world, but few focused on the bacteria for arsenic rich gold concentrates bioleaching . In this paper, the bacterial flora enriched in acid mine drainage of Dexing copper mine, Jiangxi Province, China, was used to be mutated and for arsenic rich gold

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  • Continuous bioleaching of arsenopyrite from mine tailings

    Continuous bioleaching of arsenopyrite from mine tailings

    Powder X ray diffraction spectra were measured from the tailings before bioleaching, using the method described by Lee et al., 2015. Quartz SiO 2, pyrite FeS 2, and arsenopyrite AsFeS were found to be the major minerals assuming these minerals make up 100 of the tailings, SiO 2 was 64 , FeS 2 20 , and AsFeS 16 .

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  • Fe Extraction from Cayeli Copper Ores by Bioleaching with

    Fe Extraction from Cayeli Copper Ores by Bioleaching with

    Introduction Bioleaching is a new technique used by the mining industry to extract minerals such as gold and copper from their ores while traditional extractions involve many expensive steps such as roasting and smelting, which requires sufficient concentrations of elements in ores .

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  • Bioleaching genomics   PubMed Central PMC

    Bioleaching genomics PubMed Central PMC

    Acid mine drainage liquors were found to contain bacteria responsible for producing ironrich acidic waters from coal and metal mines. Bioleaching is used todaymercial operations to process ores of copper, nickel, cobalt, zinc and uranium, whereas biooxidation is used in gold

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