high pressure oxidation of refractory gold minerals

Effect of Chloride Concentration on Gold Recovery in ...

Pressure Oxidation Process • Oxidation of sulfides, such as pyrite (FeS 2) and marcasite (FeS 2) at high T and P in autoclaves • Release of encapsulated gold grains Yes Pressure Oxidation Refractory? No Gold Ores Cyanidation Carbon Adsorption Reduction • Pretreatment of "refractory" gold ores for cyanidation to be effective

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$Method for pressure oxidizing goldbearing refractory ...$ $Method for pressure oxidizing goldbearing refractory ...$

Method for pressure oxidizing goldbearing refractory ...

Dec 22, 1998· FIELD OF THE INVENTION. The present invention involves a method for pressure oxidizing goldbearing refractory sulfide mineral materials having organic carbonaceous material, and particularly relates to pressure oxidation of such mineral materials in the presence of a halogencontaining material.

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autoclave mineral processing

Oct 20, 2018· Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from refractory ore bodies. . Upon leaving the high pressure and temperature atmosphere of the autoclave the slurry must be returned to.

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alkaline pressure oand idation of gold concentrates

OXIDATION OF REFRACTORY GOLD CONCENTRATES. OXIDATION OF REFRACTORY GOLD been studied using high pressure ion dissolution rates for the oxidation of sulfide minerals and gold . high pressure o idation of refractory gold minerals. High Pressure Oxidation Of Refractory Gold Minerals kenya Many researches consider this process .

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Valves for autoclaves – high pressure acid leaching (HPAL)

is in pressure oxidation (POx). POx is usually used in the recovery of gold from refractory ores. Figure 2 shows the typical temperature and pressure ranges for HPAL and POx. High pressure acid leaching (HPAL) 35 65 Min Pressure (Bar) Max Pressure (Bar) 200 275 Min temperature (°C) Max temperature (°C) Pressure oxidation (POx) 10 35

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Alkaline Oxidative Leaching of GoldBearing Arsenopyrite .

Alkaline pressure oxidation is not new; it was first proposed by Sill (13) in the late 1950's for treating arsenic sulfide ores and was used commercially for treating a cobaltnickel arsenic ore (14). Alkaline pressure oxidation was also used to treat highacidconsuming mercury gold ore (15).

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$pressure oxidation refractory gold$ $pressure oxidation refractory gold$

pressure oxidation refractory gold

Pressure oxidation (POX), high pressure oxidation (HiPOX) and ACTIVOX autoclave leaching are viable industrystandard technologies used to recover gold and other accessory metals. The process is particularly well suited for treating refractory gold ores, which .

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$Treatment of Refractory Gold Ores XPS$ $Treatment of Refractory Gold Ores XPS$

Treatment of Refractory Gold Ores XPS

Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified, there are a number of alternatives for treating the ore. Firstly, the gold can be made more amenable to cyanidation by ultrafine milling, followed by a hot atmospheric leach –the Albion Process.

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$Atmospheric alkaline preoxidation of refractory sulphide ...$ $Atmospheric alkaline preoxidation of refractory sulphide ...$

Atmospheric alkaline preoxidation of refractory sulphide ...

Residual cyanide levels in the leach remained positive and did not affect gold extractions. Iron oxides such as hematite, and magnetite, and iron oxyhydroxides such as goethite and ferrihydrite were observed in oxidized ore residues, indicating a high level of iron and sulphur oxidation.

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GOLD RECOVERY The golden age

"POX is a high capital cost option that usually requires its own oxygen plant and has a very high capital cost. Gold recovery is usually very high and a low cost neutralising calcrete is required. Macraes, Lihir and Porgera are examples of such projects.

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Gold Recovery And How To Choose The Right Process ...

Refractory Gold. The last type of gold deposit is called refractory gold, and it is the most difficult type to extract. It can be defined as any ore that responds poorly to a conventional gravitycyanidation process with examples including copper porphyry, complex sulfides, arsenopyrite and leadzinc associations.

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Pre concentration and pressure oxidation of Porgera ...

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 required level of pyrite oxidation.

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$Reduction of lime consumption when treating refractory ...$ $Reduction of lime consumption when treating refractory ...$

Reduction of lime consumption when treating refractory ...

Oct 11, 2005· Pressure oxidation reactions for gold bearing sulphide minerals (pyrite FeS 2 and arsenopyrite FeAsS) can be written ideally as: 4FeS 2 +15O 2 +8H 2 O→2Fe 2 O 3 +8H 2 SO 4 and 2FeAsS+7O 2 +6H 2 O→2FeAsO 2 O+2H 2 SO 4 Small amounts of iron and arsenic in the sulphide materials are also converted to the dissolved ferrous iron, ferric iron, arsenite and arsenate.

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$high pressure oxidation of refractory gold minerals$ $high pressure oxidation of refractory gold minerals$

high pressure oxidation of refractory gold minerals

high pressure oxidation of refractory gold minerals. High Pressure Oxidation of Refractory Gold Minerals | Mining, A lot of researches deem this process as the best option to the treatment of refractory material that .

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pressure oxidation gold

Pressure oxidation was developed for processing refractory ores where gold is occluded in the sulfide minerals, typically pyrite or arsenopyrite. Oxidation of the sulfides at elevated temperatures and pressures liberates the gold, allowing it to be economically recovered by conventional circuits.

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Design, Construction, and Commissioning of Air Separation ...

The ASU produces high pressure gaseous oxygen, which is used for the oxidation of refractory sulphide ore within the pressure oxidation (POX) circuit. As a result of the project's remote location and tropical climate, many challenges were faced over the course of construction, commissioning and startup of .

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Gold extraction QueensMineDesignWiki

The main pretreatment options for "unlocking" the gold from refractory ores are chemical, biological, pressure oxidation, thermal and physical treatment. The figure below indicates the various pretreatment options before cyanidation can occur for refractory ores.

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$pretreatment of refractory ores prior to gold leaching$ $pretreatment of refractory ores prior to gold leaching$

pretreatment of refractory ores prior to gold leaching

Oct 12, 2001 In the case of refractory ores containing complex minerals, gold complex refractory gold ores is a preoxidation treatment prior the gold leaching step .. to extract gold from refractory ores by the pretreatment of sulfuric acid

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$oxidation of refractory minerals$ $oxidation of refractory minerals$

oxidation of refractory minerals

high pressure oxidation of refractory gold minerals A fundamental study of the alkaline sulfide leaching of gold 337 Jeffrey and Anderson / The European Journal of Mineral Processing and Environmental Protection Vol3, No3, 1303, 0868, 2003, pp 336, 343 produce high grade pretre

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high pressure oxidation of refractory gold minerals

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