pressure oxidation gold concentrate

Oxidation of a refractory gold concentrate using pressure ...

Oxidation of a refractory gold concentrate using pressure, atmospheric and bacterial oxidation processes Hydrometallurgical processing of refactory gold ores as a rule generally entails production of a gold-rich bulk sulphide concentrate which then requires oxidation to enable recovery of the precious metals by

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Pressure Oxidation of a Refractory Sulfide Concentrate and ...

2018-8-11  Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation yields higher gold extractions from ores or concentrates

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Pressure oxidation overview - ScienceDirect

2005-1-1  Pressure oxidation refers to the oxidation of sulfides, such as pyrite [FeS2] and marcasite [FeS2], at elevated temperature and pressure. Oxidation releases encapsulated gold grains from the sulfides and makes the oxidation residue of the ore or concentrate more amenable for gold recovery by

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(PDF) Pressure oxidation of double refractory gold ...

The reasons for gold-bearing materials refractory nature and behaviour features of carbonaceous matter during pressure oxidation of concentrates were discussed. The

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(PDF) Alkaline Pressure Oxidation of a Gold-Bearing ...

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4  The oxidation of concentrate was followed during the test by measuring oxygen con-sumption. The experiment had a set value for oxygen partial pressure and that pressure was maintained by controlling oxygen feed. The oxygen was consumed in the oxida-tion reactions and therefore oxygen flow is a measure of reactions proceeding. The effect of temperature, oxygen pressure and slurry density were measured using a facto-rial

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Gold recovery from refractory gold concentrates by ...

2019-3-1  Pressure oxidation technology for the treatment of refractory gold concentrates has been deployed in some countries. Shuiyindong gold deposit is one of the Carlin-type deposits which is a typical difficult-to-treat gold deposit, located in Guizhou province in western China.

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Research on chlorination leaching of pressure-oxidized ...

2020-6-1  In this work, the hydro-leaching method consisting of the pressure oxidation pretreatment and chlorination leaching has conducted for the refractory gold concentrate with high sulfur content. XRD and SEM/EDC were used to characterize the refractory gold concentrate and the pretreated gold concentrate.

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Ammoniacal thiosulfate leaching of pressure oxidized ...

2015-1-1  Pressure oxidized gold concentrate was received from a gold mine. The gold mine processes the ore to concentrate by crushing, grinding and flotation. After

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Gold deportment and leaching study from a pressure ...

2021-5-1  Pressure oxidation (POX) is an effective method for base metal extraction and a pretreatment of refractory gold ores. A residue from pressure leaching of chalcopyrite concentrate was collected and investigated for gold recovery and deportment of metals.

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Oxidation of a refractory gold concentrate using pressure ...

CITATION:Casingena, C, Czerny, C, Paterson, L and Carter, P, 2019. Oxidation of a refractory gold concentrate using pressure, atmospheric and bacterial oxidation processes, in Proceedings World Gold 2019, p 681 (The Australasian Institute of Mining and Metallurgy: Melbourne).

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Gold recovery from refractory gold concentrates by ...

2019-3-1  flotation gold concentrate before and after pressure oxidation (POX) was analyzed. The analysis of the Eh-pH diagram revealed that pyrite/arsenopyrite would be dissolved in higher oxidation potential. Results of SEM-EDS showed that the surface of minerals became very rough and structure of some particles was destroyed after POX.

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Ammoniacal thiosulfate leaching of pressure oxidized ...

2015-1-1  The gold concentrate used in the experiments was taken from the process stream after pressure oxidation. The received gold concentrate was dried at 60 °C for 12–24 h. The dried concentrate was blended and divided into sub-samples, which were divided to representative samples for

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Experiment on Pressure Oxidation for Refractory Gold ...

Pressure oxidation process was used to treat domestic refractory gold concentrate.The effects of reaction temperature,concentrate particle,oxygen partial pressure,initial acid concentration and reaction time on desulfurization rate and leaching rate of gold were investigated.Raw ore and residue were characterized by XRD,XRF,SEM and EDX.The desulfurization rate is 93.85% when the temperature is ...

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Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite ...

2018-6-9  The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation. Alkaline pressure oxidation at 160°C, 2413 kPa O2, and 2 M ...

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Simultaneous sulfide oxidation and gold dissolution by ...

2021-8-15  Based on these results, gold extraction from pre-oxidized double refractory gold concentrate as high as 80% could be achieved by pressure oxidation combined with aggressive chloride-bromide leaching, to be used as a comparison value for direct chloride-bromide leaching, Fig. 5B.

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Amursk Pressure Oxidation (POX) Hub Expansion Project

2020-7-31  Challenges. Polymetal International Inc. is undertaking the Amursk POX Hub Expansion to recover gold from double-refractory (high carbon) sulphide concentrate from five of their mines in Siberia, Eastern Russia, and East Kazakhstan. The project will double Polymetal’s concentrate treatment capacity to 250,000-300,000 t/a of refractory gold concentrate.

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Biological Leaching-Pressure Oxidation for Auriferous ...

Previous studies indicated that pressure . oxidation of the Olympias pyrite concentrate, as compared to bacterial oxidation, resulted in similar or slightly higher gold recovery at significantly lower cyanide consumption. Capex estimate of the pressure oxidation process was higher than bacterial oxidation, but a significant portion of the

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Refractory Gold Technology

2020-1-20  Ore/Concentrate Slurry OXIDATION Gold Bullion Tailings Pond Cooling Tower Lime Cyanide Carbon Barren CIP Slurry WASTE CONTROL Pressure Oxidation of Refractory Gold Feeds TECHNOLOGY Au V1.FEB25.2019. The Technologies Division of Sherritt is a recognized leader and pioneer in

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High Pressure Acid Leach Pressure Oxidation

2016-12-20  Uranium Nickel Gold Copper Cobalt Rare earths Zinc High Pressure Acid Leach (HPAL) and Pressure Oxidation (POX) testing services provide a unique opportunity to evaluate and optimise the most economically viable process routes for the recovery of most metals such as nickel from lateritic ores and gold from refractory ores.

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Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite ...

T1 - Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite Concentrate. AU - Hiskey, J. B. PY - 1995/12/1. Y1 - 1995/12/1. N2 - The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2 pressure and NaOH concentration.

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Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite ...

2018-6-9  The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation. Alkaline pressure oxidation at 160°C, 2413 kPa O2, and 2 M ...

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pressure oxidation Archives - International Mining

2021-8-23  “Pressure oxidation was selected as the most feasible processing technology for double refractory ores. It is able to achieve gold recoveries of 96% by utilising high temperatures, elevated pressure and oxygen to recover encapsulated gold, while conventional cyanidation methods would result in

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AN INVESTIGATION OF PRESSURE, ATMOSPHERIC AND

2020-10-30  AN INVESTIGATION OF PRESSURE, ATMOSPHERIC AND BACTERIAL OXIDATION PROCESSES FOR THE TREATMENT OF A REFRACTORY GOLD CONCENTRATE By . Chris Casingena, Chad Czerny and Paul Carter (Formerly) SGS Mineral Metallurgy, Australia . Corresponding Authors . Chad Czerny. Chris Casingena . Presenter . Chad Czerny. ABSTRACT

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Gold concentrate marketing 101 - ausimm

2021-7-18  Gold ore may be transformed to concentrates for one of several reasons. If the ore is refractory (not free-milling) and the capex of a pressure oxidation (POX) or (bio-oxidation) BIOX plant cannot be justified, a mine’s only recourse may be the production of a concentrate.

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Pre concentration and pressure oxidation of Porgera ...

The complex mineralogy of the Porgera resource has a pronounced effect on process selection for the recovery of refractory gold and silver. Intimate association of gold with pyrite necessitates a high degree of sulphur preoxidation to achieve acceptable levels of gold recovery. Acid pressure oxidation has been demonstrated to be the only commercially proven process capable of achieving the ...

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Amursk Pressure Oxidation (POX) Hub Expansion Project

2020-7-31  Challenges. Polymetal International Inc. is undertaking the Amursk POX Hub Expansion to recover gold from double-refractory (high carbon) sulphide concentrate from five of their mines in Siberia, Eastern Russia, and East Kazakhstan. The project will double Polymetal’s concentrate treatment capacity to 250,000-300,000 t/a of refractory gold concentrate.

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Oxidation Behavior of Copper Concentrate, Gold Concentrate ...

2019-6-15  Oxidation Behavior of Copper Concentrate, Gold Concentrate, and Their Mixtures Between 1173 K (900 °C) and 1373 K (1100 °C)

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Biological Leaching-Pressure Oxidation for Auriferous ...

Previous studies indicated that pressure . oxidation of the Olympias pyrite concentrate, as compared to bacterial oxidation, resulted in similar or slightly higher gold recovery at significantly lower cyanide consumption. Capex estimate of the pressure oxidation process was higher than bacterial oxidation, but a significant portion of the

More

Refractory Gold Technology

2020-1-20  Ore/Concentrate Slurry OXIDATION Gold Bullion Tailings Pond Cooling Tower Lime Cyanide Carbon Barren CIP Slurry WASTE CONTROL Pressure Oxidation of Refractory Gold Feeds TECHNOLOGY Au V1.FEB25.2019. The Technologies Division of Sherritt is a recognized leader and pioneer in

More

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