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Double-Refractory Carbonaceous Sulfidic Gold Ores ...

2016-1-1  The main gold carrier in the ore shown in Figure 50.1 (a) is pyrite; the ore has a total sulfide content of 1.43% and a TCM content of 0.94%. In the ore shown in Figure 50.1 (b), gold is present as native gold, associated with pyrite and arsenopyrite and

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Bioleaching of Gold from Sulfidic Gold Ore

This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457 T and R. mucosus DSM 17069 T, to bioleach gold from electronic waste (e-waste) (1030 ppm gold) and sulfidic gold ore concentrate (45 ppm gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 days.

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Comparative investigations on sulfidic gold ore

2019-8-15  A large portion of gold reserve is sulfidic refractory ores with low gold content which is not suitable for milling and concentrating to be processed in roaster, autoclave, or tank biooxidation. More studies and research efforts should be given to advance the processing methods of

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Bioleaching of Gold from Sulfidic Gold Ore Concentrate

2020-11-14  Sulfidic gold ore concentrate was sourced from a gold mine in Western Australia and had a particle size with a P80 (i.e., 80% of mass passing) of 120 m. The gold ore concentrate was sterilized by autoclaving before leaching experiments (121C for 20 min).

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Bioleaching of Gold from Sulfidic Gold Ore

This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457T and R. mucosus DSM 17069T, to bioleach gold from electronic waste (e-waste) (1030 ppm gold) and sulfidic gold ore concentrate (45 ppm gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 days.

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Process for recovering gold from refractory sulfidic

A process for recovering gold from a refractory sulfidic ore which has been suspended in an aqueous slurry and oxidized using nitric acid so that substantially all of the gold in the ore is made available for recovery and at least a portion of the sulfidic components present during the oxidation are oxidized to elemental sulfur, comprises bubbling air as a discontinuous phase upwardly through the oxidized

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Establishing thE ProcEss MinEralogy of gold orEs

ore and double-refractory sulfidic/ carbonaceous ore. These ores are pretreated by autoclave and roaster prior to cyanide leaching (Thomas et al., 2000; Wickens et al., 2003). In the Jinya Carlin-type gold deposit in China, gold occurs mainly as submicroscopic gold in arsenopyrite and pyrite and is recovered by roasting a flotation concentrate

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A fundamental study of the alkaline sulfide leaching of gold

2015-12-27  Many gold ores are problematic as they contain metal sulfides, such as pyrite, arsenopyrite andchalcopyrite. These ores are often refractory, as the gold is encapsulated within the sulfide matrix. In orderto recover the gold, the host matrix must be destroyed. Over the past 100 years, roasting or smelting hasbeen the dominant method for oxidising sulfide bearing gold ores and concentrates. However, with the costassociated with treating SO2 gas and the increasing concerns over emissions, many gold mines haveconsidered other technologies such as bacterial leaching and pressure oxidation for treating sulfidecontaining ores. During the pressure oxidation of metal sulfides, the sulfide component can be eitherpartially oxidised, forming sulfur as a product, or completely oxidised, forming sulfate as a product. Partialoxidation of metal sulfides has the benefit that low temperatures and pressures are required, leading tolower capital costs (Anderson and Nordwick, 1996; Anderson, 2001). The biggest problem with partialoxidation of metal sulfides

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Bio-Oxidation of a Double Refractory Gold Ore and ...

2020-9-10  Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a ...

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The salsigne gold mine: A world-class ore body in the ...

2017-8-28  leach ofthe flotating waste, a remarkable gold recovery of over 80% is achieved, despite the fact that the refractory sulfidic ore is neither roasted nor subjected to a bacterial treatment. As the gold particles adhere to the sulfide crystals, very fine ball milling is required in order to expose them to the cyanide solution. This

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(PDF) Biooxidation of sulfidic refractory gold ores ...

As the scarcity of oxide gold ore deposits increases, the demand for more efficient ways to process refractory sulfidic gold ores increases as well. Most deposits in the USA are considered to be refractory sulfides. While, without the oxidation of the sulfidic coating, the gold recovery would be

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Bioleaching of Gold from Sulfidic Gold Ore

This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457T and R. mucosus DSM 17069T, to bioleach gold from electronic waste (e-waste) (1030 ppm gold) and sulfidic gold ore concentrate (45 ppm gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 days.

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Bioleaching of gold from sulfidic gold ore concentrate

This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457 T and R. mucosus DSM 17069 T, to bioleach gold from electronic waste (e-waste) (1030 ppm gold) and sulfidic gold ore concentrate (45 ppm gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 ...

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Gold Sulphide Ore Oxidation by Alkaline Pressure

2017-10-20  The alkaline pressure oxidation of sulfidic gold ores is advantageous due to its relatively mild operating conditions of 100° C and 40 psig oxygen pressure. This translates to simpler and possibly cheaper materials of construction for the autoclave

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The Oxidation Pretreatment of a Sulfidic Refractory

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H2SO4 concentration of 3.0 M, temperature of 100°C, particle size of 45μm, stirring speed of 200 rpm.

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Treating refractory gold ores via oxygen-enriched

A method for recovering gold from a gold-containing ore containing refractory sulfidic matter or a combination of sulfidic and carbonaceous matter, comprising the steps of: (a) introducing said gold-containing ore, at least one fuel, and substantially pure oxygen into a fluidized bed reactor;

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GOLD RECOVERY OF REFRACTORY SULFIDE

The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore.

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Leaching of an oxide gold ore with chloride/hypochlorite ...

ent in the ore. Gold–chloride complex is rather unstable and may re-precipitate upon contact with a reductant, such as sulfidic materials of ore. Puvvada and Murthy (2000) used chloride/hypochlorite solution to leach gold and silver from a chalcopyrite concentrate. Direct hypo-chloriteleachingof the sulfidic concentrate yielded gold

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Major Gold Deposit Types and Exploration process

2020-5-29  Gold deposits worldwide display diverse ore-genetic associations and their petrogenesis is widely debated, especially in the context of the nature and source(s) of the ore-forming fluids. Significant progress has been made in the fields of exploration geochemistry, geophysics, and data integration, providing better tools to assist

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heaps of是什么意思_heaps of怎么读_heaps of翻译_用法 ...

Biooxidation process for recovery of gold from heaps of low-grade sulfidic and carbonaceous sulfidic ore materials The uncanny valley of similarities concerning abortion , baldness , heaps of

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Comparative investigations on sulfidic gold ore

Ore samples were collected from a gold mine in Mexico and two metallurgical composites were prepared for the study. Comp #1 contains 2.7 g/t of gold and 15.4 g/t of silver with 0.33% copper and 0.11% arsenic. The total sulfur was 5.7% and the sulfide sulfur was 5.6%. Gold and silver grade of Comp #2 was 1.2 g/t and 8.8 g/t, respectively.

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(PDF) Biooxidation of sulfidic refractory gold ores ...

As the scarcity of oxide gold ore deposits increases, the demand for more efficient ways to process refractory sulfidic gold ores increases as well. Most deposits in the USA are considered to be refractory sulfides. While, without the oxidation of the sulfidic coating, the gold recovery would be

Click

Gold Sulphide Ore Oxidation by Alkaline Pressure

2017-10-20  The alkaline pressure oxidation of sulfidic gold ores is advantageous due to its relatively mild operating conditions of 100° C and 40 psig oxygen pressure. This translates to simpler and possibly cheaper materials of construction for the autoclave

Click

Bioleaching of gold from sulfidic gold ore concentrate

This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457 T and R. mucosus DSM 17069 T, to bioleach gold from electronic waste (e-waste) (1030 ppm gold) and sulfidic gold ore concentrate (45 ppm gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 ...

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The Oxidation Pretreatment of a Sulfidic Refractory

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H2SO4 concentration of 3.0 M, temperature of 100°C, particle size of 45μm, stirring speed of 200 rpm.

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The bioleaching and processing of refractory gold ore ...

Brierley, J.A. “Bio-Oxidation-Heap Technology for Pretreatment of Refractory Sulfidic Gold Ore.”BIOMINE, ’94. Chapter 10. Adelaide, Australia: Australian Mineral Foundation, 1994.

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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.

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Leaching of an oxide gold ore with chloride/hypochlorite ...

ent in the ore. Gold–chloride complex is rather unstable and may re-precipitate upon contact with a reductant, such as sulfidic materials of ore. Puvvada and Murthy (2000) used chloride/hypochlorite solution to leach gold and silver from a chalcopyrite concentrate. Direct hypo-chloriteleachingof the sulfidic concentrate yielded gold

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Major Gold Deposit Types and Exploration process

2020-5-29  Gold deposits worldwide display diverse ore-genetic associations and their petrogenesis is widely debated, especially in the context of the nature and source(s) of the ore-forming fluids. Significant progress has been made in the fields of exploration geochemistry, geophysics, and data integration, providing better tools to assist

Click

heaps of是什么意思_heaps of怎么读_heaps of翻译_用法 ...

Biooxidation process for recovery of gold from heaps of low-grade sulfidic and carbonaceous sulfidic ore materials The uncanny valley of similarities concerning abortion , baldness , heaps of

Click

Comparative investigations on sulfidic gold ore

Ore samples were collected from a gold mine in Mexico and two metallurgical composites were prepared for the study. Comp #1 contains 2.7 g/t of gold and 15.4 g/t of silver with 0.33% copper and 0.11% arsenic. The total sulfur was 5.7% and the sulfide sulfur was 5.6%. Gold and silver grade of Comp #2 was 1.2 g/t and 8.8 g/t, respectively.

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(PDF) Biooxidation of sulfidic refractory gold ores ...

As the scarcity of oxide gold ore deposits increases, the demand for more efficient ways to process refractory sulfidic gold ores increases as well. Most deposits in the USA are considered to be refractory sulfides. While, without the oxidation of the sulfidic coating, the gold recovery would be

Click

Bioleaching of gold from sulfidic gold ore concentrate

This study evaluated the ability of two IOB sourced from a commercial culture collection, Roseovarius (R.) tolerans DSM 11457 T and R. mucosus DSM 17069 T, to bioleach gold from electronic waste (e-waste) (1030 ppm gold) and sulfidic gold ore concentrate (45 ppm gold) using one-step, two-step and spent medium leaching at 1% pulp density over 10 ...

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The Oxidation Pretreatment of a Sulfidic Refractory

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H2SO4 concentration of 3.0 M, temperature of 100°C, particle size of 45μm, stirring speed of 200 rpm.

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Refractory Gold Ore Scientific.Net

Abstract: An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H 2 SO 4 concentration of 3.0 M, temperature of 100°C, particle size of 45μm ...

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Numerical modeling microwave roasting of

The recovery of gold with sulfidic ore was higher because it got roasted at the limited power levels that was applied. Scanning electron microscope studies showed size reduction of the ore particles which suggested capabilities of improved mass transfer of the lixiviant and promise of enhanced recoveries.

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Sandra K gold ore

2020-5-12  Gran Colombia Gold Corp. Sandra K deposit. Colombia. Mesothermal quartz‐sulfidic veins hosted in granodiorite rocks. Presence of Galena Related to Elevated Gold Grades at Sandra K, in Drillhole DS0130 Showing 30 cm at 311.34 g/t gold (Free Gold

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YES TECHNOLOGIES: Cyanide-free biocatalyzed

2007-6-12  How it works: Step 1: Aerobic bacteria catalyze bio-oxidation of low-grade, hard to treat (refractory), sulfidic gold ore. This step is currently being adopted by gold producers for freeing gold from base-metal sulfides (e.g., pyrite). A waste stream from the bio-oxidation step is used in a second step.

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Ultra-Trace Analysis of Metals in Mineral Reference

2021-4-25  per-gold-magnetite ore Cu, Fe, W Phosphoric acid CCU-1d Sulfidic copper concen-trate Cu, Fe, Pb, Zn Reverse aqua regia NIST 333a Molybdenum sulphide concentrate Mo Sulfuric/nitric acid Results and discussion All calibration curves were linear with a correlation coefficient

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Major Gold Deposit Types and Exploration process

2020-5-29  Gold deposits worldwide display diverse ore-genetic associations and their petrogenesis is widely debated, especially in the context of the nature and source(s) of the ore-forming fluids. Significant progress has been made in the fields of exploration geochemistry, geophysics, and data integration, providing better tools to assist

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