pressure oxidation of refractory ore

ALTA MetBytes
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implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada USA The CSIRO reagent system is an alternative to cyanide and has particular application where cyanide cannot be used and to unlock stranded high-grade deposits...

Pressure Oxidation Overview
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Jan 01 2016 0183 32 The first refractory gold pressure-oxidation plant commissioned was at the Homestake McLaughlin operation CA USA in 1985 and served as the pioneering installation for whole-ore acidic treatment Following this American Barrick Resources developed the Barrick Goldstrike mine from 1986 to 1993 which is described next Thomas and Williams...

recovery of gold from refractory ores zimbabwe
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An acidic pressure oxidation pre Know More Bacterial Oxidation of Refractory Sulfide Ores for Gold trate In a refractory ore mineral gold does pertinent for gold recovery are also relevant Establishing thE ProcEss MinEralogy of gold orEs Know More...

Pressure Oxidation Pretreatment Technology on Refractory
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The principle technological features and typical commercial applications of pressure oxidation technology on refractory gold ore were introducedThe behavior and control of arsenic during the pressure oxidation pretreatment was studiedThe crystal structure and stability of arsenate taking into form under different conditions were discussed...

Pressure oxidation of pyrite
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The refractory ore must be destroyed or attacked by chemical means with the use of oxidative processes such as oxidation by roasting 2 pressure oxidation 3 bio-oxidation 4 and ultrafine...

high pressure oxidation of refractory gold minerals in japan
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high pressure oxidation of refractory gold minerals 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 liberate the minerals from refractory...

Gold recovery from refractory gold concentrates by
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concentrate was treated by pressure oxidation in acid Dong et al 2015 Luo et al 2015 Now the flotation-pressure oxidation-cyaniding technology was taken to deal with the refractory gold ore in shuiyindong despite the recovery of gold was obtained about 82 85 Furthermore increasing...

How to Improve the Refractory Gold Leaching Process
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The gold leaching rate of most refractory gold ores is about 10 20 when they are directly stirred by sodium cyanide Generally the gold leaching rate of refractory gold ore can be greatly improved by pretreating the raw materials including oxidative roasting hot-pressure oxidation biological oxidation...

Pressure oxidation
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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 themRefractory 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...

Oxidation of a refractory gold concentrate using pressure
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Casingena C Czerny C Paterson L and Carter P 2019 Oxidation of a refractory gold concentrate using pressure atmospheric and bacterial oxidation processes in Proceedings World Gold 2019 p 681 The Australasian Institute of Mining and Metallurgy Melbourne...

A FUNDAMENTAL STUDY OF THE ACIDIC PRESSURE
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23 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 75...

Method for pressure oxidizing gold
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1 Ounces of gold per standard short ton of ore 2 Total of Cl- Br- I- titratable with silver nitrate EXAMPLE 1 This example demonstrates the effect of pressure oxidation temperature and residence time on gold recovery of refractory sulfide ores having organic carbonaceous material and that are pressure oxidized in the presence of a halogen-containing material...

An acidic pressure oxidation pre
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Roasting is the only commercialised process in Zimbabwe for the pre-treatment of refractory gold feedstocks for the subsequent cyanidation leaching This process results in only about 75 gold recovery and is characterised by high gold values in the residue A pressure oxidation process in an autoclave has been evaluated as an alternative The process resulted in substantially higher gold...

the gold strike pressure oxidation plant process
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pressure oxidation of refractory gold ores the Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and or The main pressure oxidation products from iron sulfide minerals are sulfuric acid and metal sulfates and hematite...

PRESSURE OXIDATION OF PYRITE
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of the ore indicates a refractory ore Iglesias and Carranza 1994 Fleming 1992 Cor-rans and Angove 1991 Pangum and Browner 1996 The refractory ore must be bro-ken down by chemical means with utilization of oxidative processes such as roasting pressure oxidation or bacterial leaching These expose the valuable metals to subse-...

Process Development for Refractory Gold Concentrates
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Keywords gold ores separation of the pressure oxidation pressure oxidation technology Introduction Malomir and Pioneer mine sites are located in the Russian Far East in Amur region Petropavlovsk refractory ores a strategic priority for Petropavlovsk...

Research on chlorination leaching of pressure
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Jun 01 2020 0183 32 Biological oxidation chemical oxidation pressure oxidation and roasting oxidation are now using for the pretreatment of refractory gold concentrates Li et al 2009 Su et al 2010 Wang et al 2019 among which the pressure oxidation is the most promising Zhang et al 2016b The other alternative is to search for non-cyanide lixiviants...

PRESSURE LEACHING
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A major revolution in gold processing was the pressure oxidation of refractory pyritic or In these ores gold is chemically entrained in sulfides which require oxidation prior to standard cyanidation techniqu Many of these plants were built in the western United States in...

Treatment of refractory gold more sustainable gold ounces
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Aug 19 2020 0183 32 For the processing of free-milling ores to refractory gold ores Outotec offers end-to-end process solutions including comminution flotation pressure oxidation bio-oxidation BIOX...

Alkaline Oxidative Leaching of Gold
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their possible applications to treat refractory gold ores 5 These processes can be classified as pressure oxidation 6 biological oxidation 7 and chemical oxidation 8 Emerging pressure oxidation processes that can be used to treat gold-bearing arsenopyrite include a calcium...

Application of eMAX analysis of pressure oxidation of
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A SEM-EDS based image analysis method eMAX was applied for quantitative determination of the solid composition in pressure oxidation tests of a complex refratory gold ore The decomposition of sulphides and the formation of secondary phases were calculated on the basis of the image analysis data...

Pressure Oxidation of a Refractory Sulfide Concentrate and
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Aug 11 2018 0183 32 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 most common host for gold and forms similar associations...

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES
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Refractory gold ore pretreatment processes continue to receive much attention This paper compares the relative economics of treating ores by oxygen pressure oxidation roasting and bacterial oxidation with or without preconcentration by froth flotation Capital and operating cost estimates for each method of pretreatment were prepared and...

US5536297A
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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...

Source Refractory Ores Pressure Oxidation Experts for
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Recent Refractory Ores Pressure Oxidation Inquiri Refractori I am seeking an expert in refractories used in steel mills Must have knowledge of different applications which refractory uses can be addressed via commoditized refractories and which require specialized refractories and refractory suppliers serving the north american market...

Sun High Pressure Oxidation Of Refractory Gold Minerals
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Sun High Pressure Oxidation Of Refractory Gold Minerals Biooxidation Biooxidation uses sulfur consuming bacteria in a water solution to remove sulfur Pressure oxidation Utilizes oxygen and heat under pressure in a liquid medium to effect oxidation of sulfur by way of a controlled chemical reaction High pressure autoclaves...

Pressure Oxidation Mining SGS
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Pressure oxidation POX high pressure oxidation HiPOX and ACTIVOX autoclave leaching are viable industry-standard technologies used to recover gold and other accessory metals Read more The process is particularly well suited for treating refractory gold ores which give low recovery when directly leached with cyanide...

pressure oxidation refractory gold
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pressure oxidation refractory gold 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...

Redox potential measurement during pressure oxidation POX
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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...

Recovery Refractory Resources
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options for refractory gold ores roasting pressure oxidation bio-oxidation and ultra-fine grinding In roasting pressure oxidation and bio-oxidation the iron sulphide minerals are oxidised to create sulphur dioxide SO 2 gas in the case of roasting or sulphate ions in pressure oxidation and bio-oxidation The iron component is...

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