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processes of biooxidation of gold

The BIOX® Process for Biooxidation of Gold-Bearing Ores

GENCOR S.A. Ltd. has pioneered the commercialization of biooxidation of refractory gold ores. Development of the BIOX ® process started in the late 197os at GENCOR Process Research, in Johannesburg, South Africa. The early work was championed by Eric Livesey-Goldblatt, the manager of GENCOR Process Research who directed pioneering and innovative research into bacterial oxidation

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Bio-oxidation of Arsenopyritic and Pyritic Containing Gold

The bio-oxidation of arsenic-bearing gold ore from tianli gold mine was investigated by comparing the dissolution of the sample ore in four different media, in a mix bacterial medium, mix bacterial medium after centrifugation, acidic medium and in a pure sterile medium. The experimental results showed typical oxidation characteristics for the four different media. After the first day, the

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Modeling and Analysis of Biooxidation of Gold Bearing

This model was tested in both laboratory scale batch and continuous biooxidation processes. The model predictions agreed with the experimental data reasonably well. A further analysis of the model was carried out to predict the conditions for efficient biooxidation. Studies on the effect of residence time and pulp density on steady‐state behavior showed that there is a critical residence

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Biooxidation of Refractory Gold Ores (The Geobiotics

Improved sulfide gold ore biooxidation. In: McClelland GE, Scheiner BJ, Muhtadi O. Practical aspects of international management and processing. 1996: 48–54 Google Scholar. 9. Kohr WJ. Method for rendering refractory sulfide oresmore susceptible to biooxidation. U.S. Patent No. 5, 431717. 1995. Google Scholar. 10. Kohr WJ. Method for rendering refractory sulfide ores more susceptible to

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Biooxidation process for recovery of gold from heaps of

Samples of sulfidic-carbonaceous gold ore (ore B) were used for forming particulates while inoculated (EXAMPLE 2) for column-test evaluation of biooxidation for enhanced gold recovery. One series of columns were used with formed particulates employing sulfuric acid and the microbes added after the ore was loaded in the column. A second series of columns were concurrently inoculated with T

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A new concept of the biohydrometallurgical technology for

01/09/2016· Biooxidation of gold-bearing concentrate in one-step and two-step processes The effect of leaching of gold-bearing concentrate with biogenic ferric at 80 °C on the efficiency of its subsequent biooxidation was determined in a continuous mode using the initial and the chemically oxidized concentrate samples.

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Biooxidation‒thiosulfate leaching of refractory gold

After biooxidation pretreatment, the sulfide minerals were almost completely decomposed, 92wt% of the mineral particles of the biooxidation residue were decreased to <38 μm, and the proportion of monomer gold in the biooxidation residue was over 86%. Meanwhile, the gold content in the biooxidation residue was enriched to 55.60 g/t, and the S, Fe, and As contents were reduced to approximately

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Biorecovery of gold NISCAIR

accumulate gold from solution, and some of the processes involved including biooxidation, dissolution, bioreduction, bacterial leaching, and biosorption. Gold uptake by microorganisms, fungi, and higher plants Biomining processes are llsed successfully on a

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(PDF) Gold Extraction and Recovery Processes For Internal

Gold Recovery from Solution The common processes for recovery of the solubilized gold from solution are (certain processes may be precluded from use by technical factors) [5,6]: Carbon Adsorption Merrill-Crowe process Electrowinning Ion-exchange/Solvent Extraction (i) Carbon Adsorption The process known as carbon in pulp, or charcoal in pulp or CIP controls the gold precipitation from the

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The role of microorganisms in gold processing and

01/02/2014· In general biooxidation of the gold-containing sulphide ores is a pre-treatment which can decrease the consumption of lixiviant for gold solubilisation in subsequent parts of the operation and ultimately increase gold yields. However, since it does not actually solubilise gold biooxidation needs to be used in conjunction with other methods.

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Bio-oxidation of Arsenopyritic and Pyritic Containing Gold

The bio-oxidation of arsenic-bearing gold ore from tianli gold mine was investigated by comparing the dissolution of the sample ore in four different media, in a mix bacterial medium, mix bacterial medium after centrifugation, acidic medium and in a pure sterile medium. The experimental results showed typical oxidation characteristics for the four different media. After the first day, the redox potential of the

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Modeling and Analysis of Biooxidation of Gold Bearing

This model was tested in both laboratory scale batch and continuous biooxidation processes. The model predictions agreed with the experimental data reasonably well. A further analysis of the model was carried out to predict the conditions for efficient biooxidation. Studies on the effect of residence time and pulp density on steady‐state behavior showed that there is a critical residence

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Biooxidation process for recovery of gold from heaps of

Refractory sulfidic-carbonaceous ores, typical of the Gold Quarry deposit, are amenable to biooxidation to expose the sulfide occluded gold. However, the presence of the acid-insoluble ("organic") carbon, prevents economic recovery of the gold by cyanide leaching because of the affinity of the carbon for the gold-cyanide complex. Following biooxidation, the carbon must be deactivated to facilitate the cyanide

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Modeling and analysis of biooxidation of gold bearing

Modeling and analysis of biooxidation of gold bearing pyrite-arsenopyrite concentrates by Thiobacillus ferrooxidans. Chandraprabha MN(1), Modak JM, Natarajan KA, Raichur AM. Author information: (1)Departments of Metallurgy and Chemical Engineering, Indian Institute of Bangalore, Bangalore 560012, India. The results of modeling the biooxidation of a mixed sulfidic concentrate by

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Economic evaluation of biooxidation of gold ores

Biooxidation of gold ores or concentrates could be a very attractive alternative to pressure oxidation (POX) or roasting to liberate the gold grains from various sulfides. Crushed heap bioleaching was successful in US and many operations using tank bioleaching of gold concentrate are currently running around the world. Many parameters need to be considered during the project of sulfidic

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Biooxidation-Thiosulfate Leaching of Refractory Gold

A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (10 μm) were encapsulated in pyrite and arsenopyrite, while the amount of monomer gold was only 21%.The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold

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Biooxidation‒thiosulfate leaching of refractory gold

After biooxidation pretreatment, the sulfide minerals were almost completely decomposed, 92wt% of the mineral particles of the biooxidation residue were decreased to <38 μm, and the proportion of monomer gold in the biooxidation residue was over 86%. Meanwhile, the gold content in the biooxidation residue was enriched to 55.60 g/t, and the S, Fe, and As contents were reduced to approximately

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Comparative investigations on sulfidic gold ore processing

The gold recovery from the Sand Farming was comparable to POX and roasting. Roasting calcine yielded the gold extraction of 70% while gold extraction from POX residue showed about 90%. After 44 days of Sand Farming biooxidation, 80% and 90% gold extractions were observed from Comp #1 and Comp #2, respectively. The gold extractions were further

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(PDF) Gold Extraction and Recovery Processes For

Gold Recovery from Solution The common processes for recovery of the solubilized gold from solution are (certain processes may be precluded from use by technical factors) [5,6]: Carbon Adsorption Merrill-Crowe process Electrowinning Ion-exchange/Solvent Extraction (i) Carbon Adsorption The process known as carbon in pulp, or charcoal in pulp or CIP controls the gold precipitation from the

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BIOX Technology

Biooxidation was a quick and low cost option to increase the capacity of the existing pressure oxidation plant. The BIOX ® process can also be combined with other unit processes. The BIOX ® process can be used to remove arsenic or base metal contaminants from the concentrate feed to smelter operations.

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