high pressure o idation of refractory gold minerals

high pressure o idation of refractory gold minerals

Pressure Oxidation of a Refractory Sulfide Concentrate and . Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade In sulfide ores, pyrite is the most common host mineral for gold Studies by Gasparrini (1983) showed that gold occurs in pyrite as native gold or electrum in all sizes and forms Arsenopyrite is probably the second ...

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PRESSURE OXIDATION OF REFRACTORY GOLD ORES

Pressure Oxidation Process Outotec. Outotec can provide a complete pressure oxidation plant including all auxiliary processes for refractory gold sulfide oxidation Gold is efficiently released from the sulfide matrix for the subsequent leaching process whether cyanidation or chloride leaching The Outotec pressure oxidation main process steps Carbonate and chloride removal

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Sun High Pressure Oxidation Of Refractory Gold Minerals

Ore Gold Oxidation Lijmbeekstraat. 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. Learn More.

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Pressure Oxidation Pretreatment of Refractory Gold ...

Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented. The chemistry of the aqueous ...

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Pressure Oxidation of a Refractory Sulfide Concentrate and ...

Aug 11, 2018  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 impurities. Normally, gold is extracted from neutralized autoclave leach residue by cyanidation.

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

refractoriness is due to encapsulation of the gold particles inside the host mineral. To liberate gold for leaching the host mineral must be broken by mechanical or chemical means. The aim of this study was to study the effect of temperature, oxygen partial pressure and slurry density on pressure oxidation of pyrite-arsenopyrite gold concentrate.

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Developments in the pretreatment of refractory gold ...

The high-pressure nitric acid oxidation process is shown in Figure 1. LI, D.-X. Developments on the pretreatment of refractory gold minerals by nitric acid. World Gold Conference 2009,The Southern African Institute of Mining and Metallurgy, 2009. Developments in the pretreatment of refractory gold minerals by nitric acid D.-X. LI

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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 ores.

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A systematic review of sustainable gold extraction from ...

1 天前  High-Pressure oxidation. High-pressure oxidation comprises the oxidisation of sulphide/carbonaceous gold ore at high pressure and temperature. Temperatures exceeding 200 °C and oxygen pressures above 2200 kPa are used to attain complete oxidation of the gold-bearing ore. Reaction rates can be very fast, and the technology is widely-accepted.

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lime process for gold concentrate

Pressure Oxidation of a Refractory Sulfide A 98% gold extraction and 957% silver extraction was realized as compared to 925% and 71% gold and silver extraction, respectively, under the best pressure DEVELOPMENT OF A GLYCINECYANIDE LEACH , DEVELOPMENT OF A GLYCINECYANIDE LEACH PROCESS FOR GOLDCOPPER CONCENTRATE By 1Brigitte Seaman, 2Tim Newton, 3Elsayed

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Pressure Oxidation - Caldera Engineering

Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from refractory ore bodies. The POX process utilizes elevated temperatures (roughly 230 degrees Celsius), elevated pressures (roughly 35 bar or 510 psi), and oxygen to

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The Leachox™ Refractory Gold Process – The Testing, Design ...

Oxidation . ABSTRACT . The Leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale. In this paper the successful implementation of the process, from initial testing through to commissioning at one of the world’s largest refractory gold mines is described.

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PRESSURE OXIDATION OF REFRACTORY GOLD ORES

Pressure Oxidation Process Outotec. Outotec can provide a complete pressure oxidation plant including all auxiliary processes for refractory gold sulfide oxidation Gold is efficiently released from the sulfide matrix for the subsequent leaching process whether cyanidation or chloride leaching The Outotec pressure oxidation main process steps Carbonate and chloride removal

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

The pressure oxidation approach that allows obtaining high gold recovery from double refractory materials was proposed. $/7$ : The chemical compositions of the concentrates

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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 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. It was the first application of acid pressure oxidation in China.

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Pressure oxidation of pyrite-arsenopyrite refractory gold ...

Characterization of the ores showed that pyrite and arseno-pyrite were the main minerals present on the concentrate. The best results for gold extraction were obtained with oxygen pressure of 80 ...

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pressure oxidation plants for gold mining

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 pretreatment before the gold can be adequately extracted

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High-Pressure Leaching Hazen Research

Examples of this include pressure oxidation (POX) of sulfide ores and concentrates, high-pressure acid leaching (HPAL) of nickel laterites, and wet-air oxidation of organics. Both batch and continuous reactors are available at Hazen for developing high-temperature processes. Hazen's engineers have assisted clients in developing POX processes for refractory gold ores, metals

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A systematic review of sustainable gold extraction from ...

1 天前  High-Pressure oxidation. High-pressure oxidation comprises the oxidisation of sulphide/carbonaceous gold ore at high pressure and temperature. Temperatures exceeding 200 °C and oxygen pressures above 2200 kPa are used to attain complete oxidation of the gold-bearing ore. Reaction rates can be very fast, and the technology is widely-accepted.

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Mineralogical characteristics and treatment of refractory ...

Jan 01, 1989  Minerals Engineering, VoI. 2, No. 4, pp. 449-457, 1989 0892-6875/89 $3.00 + 00 Printed in Great Britain 1989 Pergamon Press pie MINERALOGICAL CHARACTERISTICS AND TREATMENT OF REFRACTORY GOLD ORES C. KOMNITSAS and F.D. POOLEY University of Wales College of Cardiff, School of Engineering, Division of Mining and Minerals Engineering, Newport Road, Cardiff

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lime process for gold concentrate

Pressure Oxidation of a Refractory Sulfide A 98% gold extraction and 957% silver extraction was realized as compared to 925% and 71% gold and silver extraction, respectively, under the best pressure DEVELOPMENT OF A GLYCINECYANIDE LEACH , DEVELOPMENT OF A GLYCINECYANIDE LEACH PROCESS FOR GOLDCOPPER CONCENTRATE By 1Brigitte Seaman, 2Tim Newton, 3Elsayed

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Acid leaching decarbonization and following pressure ...

Jul 16, 2016  Kinetics of high-sulphur and high-arsenic refractory gold concentrate oxidation by dilute nitric acid under mild conditions [J]. Minerals Engineering, 2009, 22: 111–115. Article Google Scholar [16] LONG H, DIXON D G. Pressure oxidation of pyrite in sulfuric acid media: a kinetic study [J]. Hydrometallurgy, 2004, 73: 335–349.

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Amursk Pressure Oxidation (POX) Hub Expansion Project

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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Development of key technologies in terms of process and ...

The adaptability of pressure oxidation and its corresponding chemical mechanism on refractory gold ores, such as carbon- and arsenic-bearing gold ore (Carlin type), high-copper and high-arsenic gold ore and antimony-bearing and high-arsenic gold ore, have been developed. The international technical barriers have been successfully broken through.

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Pressure oxidation - findatwiki

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. The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation.

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Amursk Pressure Oxidation (POX) Hub Expansion Project

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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pressure oxidation Archives - International Mining

“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 sub-optimal recovery rates of 20-40%.

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refractory gold Archives - International Mining

“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 sub-optimal recovery rates of 20-40%.

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High-Pressure Leaching Hazen Research

Examples of this include pressure oxidation (POX) of sulfide ores and concentrates, high-pressure acid leaching (HPAL) of nickel laterites, and wet-air oxidation of organics. Both batch and continuous reactors are available at Hazen for developing high-temperature processes. Hazen's engineers have assisted clients in developing POX processes for refractory gold ores, metals

More

lime process for gold concentrate

Pressure Oxidation of a Refractory Sulfide A 98% gold extraction and 957% silver extraction was realized as compared to 925% and 71% gold and silver extraction, respectively, under the best pressure DEVELOPMENT OF A GLYCINECYANIDE LEACH , DEVELOPMENT OF A GLYCINECYANIDE LEACH PROCESS FOR GOLDCOPPER CONCENTRATE By 1Brigitte Seaman, 2Tim Newton, 3Elsayed

More

A systematic review of sustainable gold extraction from ...

1 天前  High-Pressure oxidation. High-pressure oxidation comprises the oxidisation of sulphide/carbonaceous gold ore at high pressure and temperature. Temperatures exceeding 200 °C and oxygen pressures above 2200 kPa are used to attain complete oxidation of the gold-bearing ore. Reaction rates can be very fast, and the technology is widely-accepted.

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Minerals Metallurgical Processing

Iron sulfide minerals break down completely during pressure oxidation, and dissolve in the sulfuric acid solution that is generated from oxidation of the sulfides. This dissolution liberates the tiny gold particles that were originally trapped in the sulfide crystals, and gold recovery during subsequent cyanidation is usually very high (>95%).

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Potential pre-treatment and processing routes for recovery ...

2.1 Microwave pre- treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to recovery by subsequent treatment techniques (Haque, 1987).

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autoclave gold recovery plant - BINQ Mining

Apr 19, 2013  The Goldstrike Autoclave Plant Design, Commissioning And Operation plant is designed for the pressure oxidation of 1363 t/d (1500 stpd) of refractory gold ore. design of the splash/flash system of heat recovery and the control systems.

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Leaching Kinetics of Sulfides from Refractory Gold ...

The processing of refractory gold-containing concentrates by hydrometallurgical methods is becoming increasingly important due to the depletion of rich and easily extracted mineral resources, as well as due to the need to reduce harmful emissions from metallurgy, especially given the high content of arsenic in the ores. This paper describes the investigation of the kinetics of HNO3 leaching of ...

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

of mineral indicates a refractory mineral [1]. The refrac- tory ore must be destroyed or attacked by chemical means with the use of oxidative processes, such as oxida- tion by roasting [2], pressure oxidation [3], bio-oxidation [4], and ultrafine grinding [5]. Then, a suitable pretreat- ment process is often required to overcome the refracto-

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