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high pressure oxidation of refractory gold minerals

high pressure oxidation of refractory gold minerals

  • PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE

    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 formedPressure 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 themRefractory ores require pretreatment before the gold can be adequately extracted The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidationPressure oxidation WikipediaThe pressure oxidation approach that allows obtaining high gold recovery from double refractory materials was proposed $/7$ : The chemical compositions of the concentrates(PDF) Pressure oxidation of double refractory gold

  • PRESSURE OXIDATION OF PYRITEARSENOPYRITE

    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 pyritearsenopyrite gold concentrateNov 11, 2020· Characteristics and risks of refractory gold mines 111120; 71 Views; icon 0 The main methods used in industrial production for the treatment of refractory gold ore or gold concentrate are roasting, pressure oxidation and bacterial oxidation All these methods have many years ofProcess of refractory gold mines,gold mines containingHigh pyrite oxidation yields are expected to occur in autoclaves at much higher temperatures (eg,190to 230°C), as routinely observed in the pretreatment of refractory gold ores (RusanenPressure oxidation of pyritearsenopyrite refractory gold

  • Developments in the pretreatment of refractory gold

    The highpressure nitric acid oxidation process is shown in Figure 1 LI, DX 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 DX LISulfide Iron Leaching For Gold Recovery Flowsheet Pressure Oxidation Of Refractory Gold Ores The 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 containingSun High Pressure Oxidation Of Refractory Gold Minerals23 Pretreatment of Refractory Sulfidic Gold Ores 15 231 Pressure Oxidation 18 24 Acidic Pressure Oxidation of Iron and Arsenic Sulfide Minerals 29 References 38 CHAPTER 3 FUNDAMENTALS OF OXIDATION 45 31 Thermodynamics 45 32 Kinetic Considerations 59 321 Kinetic Model 64 References 72 CHAPTER 4 EXPERIMENTAL PROGRAM 75 41 Materials 75A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE

  • 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 describedThe pressure oxidation approach that allows obtaining high gold recovery from double refractory materials was proposed $/7$ : The chemical compositions of the concentrates(PDF) Pressure oxidation of double refractory goldCharacteristics and risks of refractory gold mines 111120; 71 Views; icon 0 The main methods used in industrial production for the treatment of refractory gold ore or gold concentrate are roasting, pressure oxidation and bacterial oxidation All these methods haveProcess of refractory gold mines,gold mines containing

  • Pressure oxidation of pyritearsenopyrite refractory gold

    High pyrite oxidation yields are expected to occur in autoclaves at much higher temperatures (eg,190to 230°C), as routinely observed in the pretreatment of refractory gold ores (Rusanenrefractoriness 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 pyritearsenopyrite gold concentratePRESSURE OXIDATION OF PYRITEARSENOPYRITEJan 01, 2004· The alkaline oxidation of refractory gold concentrates containing arsenopyrite and pyrite at ambient temperatures and pressures has been found to be accompanied by the simultaneous dissolution of gold without the addition of cyanide A detailed study has been made of the kinetics of the oxidation of the pure minerals and of several concentrates[PDF] OXIDATION OF REFRACTORY GOLD CONCENTRATES

  • How to Improve the Refractory Gold Leaching Process?xinhai

    The alkaline hotpressure oxidation is only suitable for refractory gold deposits with high carbonate content and low sulfide content (20%) The acidic hotpressure oxidation means that the pyrite, arsenopyrite and other sulfides react with the oxygen in an acidic medium under the high temperature and high pressure After the mineral structure23 Pretreatment of Refractory Sulfidic Gold Ores 15 231 Pressure Oxidation 18 24 Acidic Pressure Oxidation of Iron and Arsenic Sulfide Minerals 29 References 38 CHAPTER 3 FUNDAMENTALS OF OXIDATION 45 31 Thermodynamics 45 32 Kinetic Considerations 59 321 Kinetic Model 64 References 72 CHAPTER 4 EXPERIMENTAL PROGRAM 75 41 Materials 75A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURETo compare process routes and recoveries, pressure oxidation can completely breakdown the sulphides and then achieve high gold recoveries, maybe greater than 95% Where as with the Leachox process and the partial oxidation, depending on the nature of the mineralogy, recoveries in the range 80% to 90% can be expected:: Maelgwyn Minerals’ Leachox Refractory Gold Process hits

  • 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 suboptimal recovery rates of 2040%Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS)6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and certain other mineralsRefractory Gold Ore Treatment MethodsTable 4 Summary of selected US patents related to gold extraction/recovery 25/3/86 Treatment of refractory ores US Patent No Title Date Summary of Process Pressure oxidation, cyanidation and CIP recovery 4,578,163 Gold recovery process Flowsheet provided in Appendix A 4,597,791 Gold recovery processes 1/7/86 Introduction of hydrophobic liquids(PDF) Gold Extraction and Recovery Processes For Internal

  • Ural Federal University: Researchers Explored Alternative

    Jan 11, 2021· For example, persistent ore and manmade materials containing sulfide minerals and serving as gold carriers – pyrite and arsenopyrite – are promising Classical approaches involve the use of high pressure or pyrometallurgical processes, but there is also an alternative – exposure to nitric acid, which ensures high environmental safety andOnce the deportment or textural associations of the gold is determined and the mass balance known, flowsheet options are developed Gold in sulfide minerals could be liberated by oxidization using techniques such as roasting, high temperature pressure leaching or bacterial leachingRefractory Gold | SGSThe main sulphide minerals that serve as gold carriers in lowgrade raw materials are pyrite and arsenopyrite Traditional methods of processing such refractory raw materials rely on highpressure or pyrometallurgical oxidisation, which destroys the crystal lattice of sulphides and releases gold particlesKinetics and mechanism of arsenopyrite leaching in nitric

  • [PDF] OXIDATION OF REFRACTORY GOLD CONCENTRATES

    Jan 01, 2004· The alkaline oxidation of refractory gold concentrates containing arsenopyrite and pyrite at ambient temperatures and pressures has been found to be accompanied by the simultaneous dissolution of gold without the addition of cyanide A detailed study has been made of the kinetics of the oxidation of the pure minerals and of several concentratesTo compare process routes and recoveries, pressure oxidation can completely breakdown the sulphides and then achieve high gold recoveries, maybe greater than 95% Where as with the Leachox process and the partial oxidation, depending on the nature of the mineralogy, recoveries in the range 80% to 90% can be expected:: Maelgwyn Minerals’ Leachox Refractory Gold Process hitsThe oxidation of refractory gold concentrates containing arsenopyrite and pyrite aerated alkaline solutions have been studied using high pressure ion chromatography an anodic oxidation of the mineral involving hydroxyl ions coupled to a cathodic processOXIDATION OF REFRACTORY GOLD CONCENTRATES AND

  • New Technology for Recovery of Gold and Silver by Pressure

    of pressure aqueous preoxidation of the sulphi de minerals Pressure oxidation has been the most popular method for the treatment of refractory gold concentrates (see Table 1); This process utilizes oxygen or air at high pressures and temperatures to oxidize an aqueoususing activated carbon Recently, high gold losses were observed Furthermore, the ore mineralogy of the feed samples is refractory The pressure oxidation leads to complete alteration of the mineralogy, rendering the feed sample unsuitable for examination For this reason, the present study mainlyCIL Gold Loss Characterization within Oxidized Leach TailsPressure Oxidation Which leads us nicely to the gold standard for refractory processing: POX Although POX does carry significant CAPEX and OPEX costs, it can be harnessed to create significant value One such example is Russian gold producer, PetropavlovskRefining Gold Processing | E & MJ

  • The BIOX™ Process for the Treatment of Refractory Gold

    Adams D, Preston M, Post T (1998) Mixing optimisation of high pressure oxidation of gold ore slurries In: Proceedings Randol 1998, pp 217–22123 Pretreatment of Refractory Sulfidic Gold Ores 15 231 Pressure Oxidation 18 24 Acidic Pressure Oxidation of Iron and Arsenic Sulfide Minerals 29 References 38 CHAPTER 3 FUNDAMENTALS OF OXIDATION 45 31 Thermodynamics 45 32 Kinetic Considerations 59 321 Kinetic Model 64 References 72 CHAPTER 4 EXPERIMENTAL PROGRAM 75 41 Materials 75A FUNDAMENTAL STUDY OF THE ACIDIC PRESSUREFour ironsulphidecontaining gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold This pretreatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test ThreeAtmospheric alkaline preoxidation of refractory sulphide

  • Refractory Gold Ore Treatment Methods

    Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS)6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and certain other mineralsIron 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%)Minerals & Metallurgical Processing“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 suboptimal recovery rates of 2040%pressure oxidation Archives International Mining

  • Recovery Refractory Resources SGS

    than pressure oxidation While there isn’t one set procedure for refractory gold ore processing, SGS looks at every situation separately, to evaluate which option is the best fit” ROASTING Roasting is generally applied to sulphide minerals and refractory ores ItOct 02, 2020· The formation of monoclinic FeOHSO 4 was also observed as a byproduct at elevated temperatures in the industrial pressure oxidation (POX) hydrothermal treatment of refractory gold(PDF) Basic iron sulfate A potential killer in the

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