pressure o idation of refractory gold minerals

PRESSURE OXIDATION OF REFRACTORY GOLD ORES:

2014-10-1  Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the autoclave, acid containing iron compounds can be formed.

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Pressure Oxidation Pretreatment of Refractory Gold ...

1984-2-1  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

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

Santa Fe Pacific Gold Corp. conducted pressure-oxidation pilot plant studies on refractory carbonaceous gold ores from the Twin Creeks Mine in Nevada. The

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4  PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE REFRACTORY GOLD CONCENTRATE Lauri RUSANEN, Jari AROMAA, Olof FORSEN Aalto University, Department of Materials Science. P.O. Box 16200, Aalto, Espoo, Finland, [email protected] Abstract: Refractory gold ores have poor gold recoveries with direct cyanide leaching. Typically the

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high pressure oxidation of refractory gold minerals

Pressure oxidation of these refractory gold mineral carriers is a very complex reaction system involving several oxidation and hydrolytic reactions which occur in series and/or parallel.high pressure oxidation of refractory gold minerals Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from ...

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PRESSURE OXIDATION OF REFRACTORY GOLD ORES

2019-12-20  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

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Application of eMAX analysis of pressure oxidation of ...

1994-2-1  Minerals Enineering, Vol. 7, Nos 2/3, pp. 239-249, 1994 0892--6875/94 $6.00+0.00 Printed in Great Britain 1993 Pergamon Press Ltd APPLICATION OF eMAX IMAGE ANALYSIS TO PRESSURE OXIDATION OF REFRACTORY GOLD ORES J.M. LAUKKANEN and J.O. LEPPINEN Technical Research Centre of Finland, Laboratory of Mineral Processing, FIN

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Method for pressure oxidizing gold-bearing refractory ...

1996-9-11  Provided is a method for treating refractory gold-bearing ores that have both sulfide material with which the gold is associated and from which the gold is difficult to separate and having organic carbonaceous material having an affinity for at least one of gold and a gold complex. The mineral material is pressure oxidized in the presence of a halogen-containing

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Pressure oxidation overview - ScienceDirect

2005-1-1  The utilization of a pressure-oxidation circuit to treat refractory gold ores or concentrates is a complex decision, taking into consideration capital costs, operating costs, gold recovery, and environmental impacts. The payback and internal rate of return (IRR) has to be evaluated in the decision for selecting the process.

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Basic Iron Sulphate in Pressure Oxidation Processing

SGS MINERALS SERVICES. TECHNICAL PAPER 2009-06 2009. BASIC IRON SULPHATE – A POTENTIAL KILLER FOR PRESSURE OXIDATION PROCESSING . OF REFRACTORY GOLD CONCENTRATES IF NOT HANDLED APPROPRIATELY. C.A. FLEMING –– SGS MINERALS. ABSTRACT. Refractory gold concentrates often contain sub-microscopic gold that is

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

Santa Fe Pacific Gold Corp. conducted pressure-oxidation pilot plant studies on refractory carbonaceous gold ores from the Twin Creeks Mine in Nevada. The tests were conducted at Hazen Research ...

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Oxidation of a refractory gold concentrate using pressure ...

The gold group at SGS Minerals Metallurgy (Malaga, Western Australia) has conducted a test programme in which a refractory gold ore sample was beneficiated by bench-scale floatation to generate a bulk sulphide concentrate grading 10.6 g/t Au, 13.1% S, 11.4% Fe, 0.18% C and 2.36% As. Mineralogical analyses determined that gold in the ore was ...

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PRESSURE OXIDATION OF REFRACTORY GOLD ORES

2019-12-20  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

More

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 and enables better handling

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high pressure oxidation of refractory gold minerals

Pressure oxidation of these refractory gold mineral carriers is a very complex reaction system involving several oxidation and hydrolytic reactions which occur in series and/or parallel.high pressure oxidation of refractory gold minerals Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from ...

More

Method for pressure oxidizing gold-bearing refractory ...

1996-9-11  Provided is a method for treating refractory gold-bearing ores that have both sulfide material with which the gold is associated and from which the gold is difficult to separate and having organic carbonaceous material having an affinity for at least one of gold and a gold complex. The mineral material is pressure oxidized in the presence of a halogen-containing

More

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

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OXIDATION OF REFRACTORY GOLD

The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures and pressures without the addition of cyanide has been studied. It involves the following aspects: the chemistry of the oxidation of pure arsenopyrite and pyrite minerals in aerated alkaline

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Developments in the pretreatment of refractory gold ...

2009-11-20  processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid. These processes include the high-pressure and the atmospheric-pressure oxidation methods. High-pressure oxidation processes are difficult to carry out, because they require high-capital cost autoclaves.

More

Pressure oxidation of pyrite-arsenopyrite refractory gold ...

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. Batch oxidation tests in an autoclave were done using a factorial design.

More

Oxidation of a refractory gold concentrate using pressure ...

The gold group at SGS Minerals Metallurgy (Malaga, Western Australia) has conducted a test programme in which a refractory gold ore sample was beneficiated by bench-scale floatation to generate a bulk sulphide concentrate grading 10.6 g/t Au, 13.1% S, 11.4% Fe, 0.18% C and 2.36% As. Mineralogical analyses determined that gold in the ore was ...

More

high pressure oxidation of refractory gold minerals

Pressure oxidation of these refractory gold mineral carriers is a very complex reaction system involving several oxidation and hydrolytic reactions which occur in series and/or parallel.high pressure oxidation of refractory gold minerals Pressure Oxidation (POX) is a process used to extract gold, copper, zinc, molybdenum, and uranium from ...

More

Pilot Plant Pressure Oxidation of a Refractory Gold-Silver ...

2013-1-1  The feed contained 39 g/t Au and 970 g/t Ag; the major gold-bearing minerals were pyrite and arsenopyrite. Because the feed contained a significant amount of silver, which can be refractory to cyanide leaching after pressure oxidation due to the formation of argentojarosite, the test program included investigation of methods to enhance silver ...

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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

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A fundamental study of the acidic pressure oxidation of ...

The acidic pressure oxidation of pyrite (FeS2) and orpiment (As2S3), as a pretreatment of refractory gold ores, has been studied by investigating the reaction chemistry and kinetics. The effects of retention time, temperature, particle size, oxygen partial pressure, pulp density, sulfuric acid concentration, and cupric ions were evaluated for ...

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OXIDATION OF REFRACTORY GOLD

The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures and pressures without the addition of cyanide has been studied. It involves the following aspects: the chemistry of the oxidation of pure arsenopyrite and pyrite minerals in aerated alkaline

More

Developments in the pretreatment of refractory gold ...

2009-11-20  processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid. These processes include the high-pressure and the atmospheric-pressure oxidation methods. High-pressure oxidation processes are difficult to carry out, because they require high-capital cost autoclaves.

More

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

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Pressure oxidation of pyrite-arsenopyrite refractory gold ...

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. Batch oxidation tests in an autoclave were done using a factorial design.

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A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

2020-8-11  2.3 Pretreatment of Refractory Sulfidic Gold Ores 15 2.3.1 Pressure Oxidation 18 2.4 Acidic Pressure Oxidation of Iron and Arsenic Sulfide Minerals 29 References 38 CHAPTER 3 FUNDAMENTALS OF OXIDATION 45 3.1 Thermodynamics 45 3.2 Kinetic Considerations 59 3.2.1 Kinetic Model 64 References 72 CHAPTER 4 EXPERIMENTAL PROGRAM 75 4.1

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