pressure oxidation refractory gold

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GOLD AUTOCLAVE FUNDAMENTALS - tahija13

2 Kenneth G Thomas, "Alkaline and Acidic Autoclaving of Refractory Gold Ores", Journal of Metals Fe 1991: 16-9 3 Roman MGS Berezowsky and D Robert Weir, "Factors affecting the selection of pressure oxidation for the pretreatment of refractory gold ores", Publication unknown 4...

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE ,

Pressure oxidation of pyrite-arsenopyrite refractory gold concentrate 103 Autoclave oxidation tests were conducted in Büchi ecoclave model 075 titanium autoclave The total volume of the autoclave vessel was about 11 dm3 and it was equipped with magnetic agitation unit, gas inlet and outlet, and sampling system with...

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Basic Iron Sulphate in Pressure Oxidation Processing

Refractory gold concentrates often contain sub-microscopic gold that is encapsulated within the crystal matrix of iron sulphide minerals such as pyrite, pyrrhotite and arsenopyrite To recover the gold, the host mineral must generally be broken down chemically, by oxidative processes such as roasting, pressure oxidation or bacterial...

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Valves for gold autoclave pressure oxidation (POX) -

Autoclave pressure oxidation (POX) is an effective pre-treatment option when extracting gold from refractory ore bodies, such as pyrite and arsenopyrite While gold processing plants are the most common utilizers of POX technology, the process can also be ,...

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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...

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Gold extraction - Wikipedia

Pressure oxidation; Albion process; The refractory ore treatment processes may be preceded by concentration (usually sulfide flotation) Roasting is used to oxidize both the sulfur and organic carbon at high temperatures using air and/or oxygen Bio-oxidation involves the use of bacteria that promote oxidation reactions in an aqueous environment...

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Developments in the pretreatment of refractory gold ,

processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric ac These processes include the high-pressure and the atmospheric-pressure oxidation methods High-pressure oxidation processes are difficult to ,...

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Ultra Fine Grinding - A Practical Alternative to Oxidative ,

The traditional approach for such refractory material has been to liberate the locked gold by chemically destroying the pyrite through oxidation Roasting, pressure oxidation, and bacterial oxidation all employ various degrees of temperature, pressure and catalysis to react the pyrite with oxygen to produce an iron oxide and sulphur by-products ....

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Acid leaching decarbonization and following pressure ,

Jul 16, 2016· Abstract Carbonate decomposition of carbonic refractory gold ore and the following pressure oxidation were studied In the carbonate decomposition procedure, the effects of liquid-to-solid ratio and reaction time on decomposition ratio of carbonate were investigated...

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Redox potential measurement during pressure oxidation (POX ,

Pressure oxidation (POX) leaching has been commercially applied to refractory gold ores since the 1980s In the process, sulphide material is oxidised and dissolved in order to release the gold encapsulated in the sulphide matrix, making the gold available for further recovery Redox potential is ,...

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Pressure Oxidation Overview - ScienceDirect

An overview of the pressure oxidation of refractory gold ores is provided in this chapter Often there are advantages to be gained by operating at temperatures above the normal boiling point of the solution and, therefore, at pressures above atmospheric In such cases, the term pressure ,...

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Sherritt International - Operations - Technologies ,

Pressure oxidation of refractory gold ores and concentrates Many gold ores and concentrates contain fine gold particles locked within sulphide minerals, such as pyrite and/or arsenopyrite, which make this gold unavailable for recovery by conventional cyanide leaching...

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A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE ,

ABSTRACT The acidic pressure oxidation of pyrite (FeS 2) and orpiment (As 2S 3), as a pretreatment of refractory gold ores, has been studied by investigating the reaction chemistry and kinetics...

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Pressure Oxidation of a Refractory Sulfide Concentrate and ,

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 and enables better handling of environmentally sensitive impuriti Normally, gold is extracted from neutralized autoclave leach residue by cyanidation...

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Refractory Gold Ore Treatment Methods

Pressure oxidation (POX) remains a further option for the oxidation of refractory sulfid Several projects have been recently constructed: the Killita Project in Finland, the Amursk Project in Russia, the Pueblo Viejo Project in the Dominican Republic, and the MOPU expansion at Lihir...

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Pressure Oxidation Overview - ScienceDirect

An overview of the pressure oxidation of refractory gold ores is provided in this chapter Often there are advantages to be gained by operating at temperatures above the normal boiling point of the solution and, therefore, at pressures above atmospheric In such cases, the term pressure ,...

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Titanium Internals in Refractory Lined Pressure Oxidation ,

Successful pressure oxidation requires mass transfer and dispersion of oxygen gas into the slurry, allowing chemical reactions which liberate precious metals In the case of Pueblo Viejo gold, gold was liberated from sulphide or Slurries must also be sufficiently agitated to prevent solids from settling out...

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Gold recovery from refractory gold concentrates by ,

Pressure oxidation technology for the treatment of refractory gold concentrates has been deployed in some countri 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 It was the first application of acid pressure oxidation in China...

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US5536297A - Gold recovery from refractory carbonaceous ,

A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 87 while the slurry is agitated in a ....

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Patents Assigned to Barrick Gold Corporation - Justia ,

Abstract: A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a ....

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Autoclave Technology - Hatch

With the right innovative and proprietary equipment designs, your pressure-oxidation needs can be effectively met Our services are unique to your needs We operate through the entire range of activities: feed-stock testing, construction material selection, advanced instrumentation, attention to safety, and operator-friendly plant layout...

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Pressure Oxidation Process - Outotec

Pressure Oxidation Process; Outotec® Pressure Oxidation Process Get a comprehensive solution for refractory gold sulfide oxidation from one reliable supplier The Outotec pressure oxidation process solution offers a sustainable and economical process in a complete pressure oxidation plant with a high level of automation and process control...

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Sherritt International - Operations - Technologies ,

Pressure oxidation of refractory gold ores and concentrates Many gold ores and concentrates contain fine gold particles locked within sulphide minerals, such as pyrite and/or arsenopyrite, which make this gold unavailable for recovery by conventional cyanide leaching...

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Pressure oxidation - Wikipedia

Pressure Oxidation is a process for extracting gold from refractory ore The most common refractory ores are pyrite and arsenopyrite, which are sulfide ores that trap the gold within them Refractory ores require pre-treatment before the gold can be adequately extracted...

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US Patent for Gold recovery from refractory carbonaceous ,

Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and resin-in-pulp adsorption Jul 16, 1996 - Barrick Gold Corporation A process for treatment of precious metal ores in which gold is leached from an oxidized ore ,...

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In-situ Adsorption of Gold(III) Chloride on Activated ,

In-situ Adsorption of Gold(III) Chloride on Activated Carbon Under Pressure Oxidation-Leaching Conditions Jean-Christophe Parisien-La Salle Department of Mining and Materials Engineering...

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US4552589A - Process for the recovery of gold from ,

A process for recovering precious metals from a refractory ore by forming a slurry which is heated to a temperature in excess of about 150° C at an oxygen partial pressure in excess of about 10 psia for an effective amount of time to form a partially oxidized slurry which is then subjected to carbon-in-leach treatment to separate the precious metals...

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High Pressure Acid Leach & Pressure Oxidation

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 or...

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Autoclave and Pressure Oxidation | Mining and Minerals ,

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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Pressure Oxidation | Mining | SGS South Africa

The process is particularly well suited for treating refractory gold ores, which give low recovery when directly leached with cyanide SGS is a world leader in batch and pilot plant testing and flowsheet development for pressure oxidation processing...

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