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APPLICATION OF THE BIOX PROCESS TO THE PRETREATMENT

Refractory Gold Ore Processing at the Ashanti Goldfields Company Ltd Sansu Treatment Plant Using Biox Technology 1993 3 Georgescu P.D Groza N Diaconu C Aurelian F Application of the BIOX process to the pretreatment of refractory sulphide gold ores and concentrates in order to increase Au and Ag recovery rate in hydrometallurgical

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refractory gold ore crushing process

Microbial Pretreatment of Refractory Gold OreXinhai For coarse grain size of gold after crushing and grinding by flotation gravity concentration cyanide leaching process or several process combined treatment will be able to complete the separation of gold and gangue minerals but there are some curing refractory gold ores due to coarse size or thin and gangue minerals symbiosis

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gold production from refractory ores

Refractory gold ores Challenges and opportunities for a Mar 23 2021 Gold miners are facing a reserves crisis and what is left in the ground is becoming more and more challenging to process.Refractory gold reserves which require more sophisticated treatment methods in order to achieve oxide ore recovery rates correspond to 24 percent of current gold reserves and 22 percent of gold

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Aqua Regia Refractory Gold Ore Extraction Process

Aqua Regia Refractory Gold Ore Extraction Process aqua regia refractory gold ore extraction process A process for the recovery of precious metal values from ores whereby the ore in particulate form is heated with a mixture of solid dry chloride and nitrate salts in the absence of oxygen The precious metal values are recovered in the form of the corresponding chlorides which are removed from

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Complete process and equipment solutions for refractory

17 09 2021  The current high gold price is increasing the focus on the development of refractory gold ores and concentrates Outotec can deliver the three main oxidative processes for the treatment of refractory gold concentrates BIOX pressure oxidation and roasting and also supply equipment for ultra fine grinding as a fourth non oxidative treatment option.

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10.1016/j.mineng.2009.09.018

11 06 2020  1 Introduction Primary gold ores are often refractory because the gold is locked small disseminated particles or solid solution gold within the sulfide matrix Pretreatment of the primary ores or their flotation concentrates is usually necessary to oxidize the sulfide matrix and allow leaching reagents such as cyanide access to the liberated gold particles.

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Ore Treatment Refractory

The Treatment Of Refractory Ores Review pretreatment process on refractory gold ores the treatment Of refractory ores mr jas shedlock with the assistance of mr denny of australia has constructed on behalf of the metallurgical syndicate of 105 gresham house london an apparatus on a commercial scale which it is said effects at the smallest expense and with the best economical

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gold refractory ore classification preprocessing methods

Classification of refractory ores 1 Carbonaceous gold ore There is organic carbon which can do Rob gold in gold and silver ore and it causes that gold is adsorbed in the cyanide solution make ore difficult to cyanide and leach Generally we use roasting and chlorination pretreatment to

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MODELING OF HIGH PRESSURE PRETREATMENT PROCESS FOR GOLD

Keywords pretreatment process pressure oxidation refractory gold ore and concentrate leaching modeling Investigation of high pressure pretreatment process for gold leaching is the objective of the present master s thesis The gold ores and concentrates which cannot be easily treated by leaching process are called refractory .

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Pressure Oxidation Refractory Gold

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 brief review of the literature on pressure oxidation of refractory gold

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Pretreatment Of Refractory Ores In Gold Leaching Process Congo

Pretreatment Of Refractory Ores Prior To Gold Leaching Pretreatment Of Refractory Ores Prior To Gold Leaching The most common leaching process for gold dissolution involves cyanidation a process that has

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Pretreatment of copper bearing refractory gold ores by bio

The refractory gold ores associated with rich copper and trapped in pyrite and quartz were studied With conventional technique all sliming cyanidation the gold recovery rate is only 51.78 To eliminate the negative effects of copper and pyrite on cyanidation and increase the gold recovery rate the investigation on bio heap leaching pretreatment was made by which Cu would be dissolved

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refractory gold processes

Pretreatment Process on Refractory Gold Ores with As Xin yuan NAN Xin CAI and Jun KONG School of Electrical Engineering Xinjiang University 1230 Yan an Road ECONOMICS OF REFRACTORY GOLD ORE PROCESSES ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E Litz and R Wayne Carter 119th TMS Annual Meeting February 18 22 1990 Hazen

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NIOSHTIC 2 Publications Search

The U.S Bureau of Mines is investigating the treatment of refractory gold ores Chlorination in the treatment of refractory gold ores is applicable in many low grade gold operations When usable this treatment provides an economic means of consuming sulfides and deactivating disseminated organic carbon Chlorination however is a pretreatment technique that requires the neutralization of the

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The Oxidation Pretreatment of a Sulfidic Refractory Gold

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite The influences of various parameters were studied to optimize the conditions The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0 H2SO4 concentration of 3.0 M temperature of 100°C particle size of 45μm stirring speed of 200 rpm.

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Refractory gold ores in Archaean greenstones Western

Pyritic ores are free milling to mildly refractory or rarely moderately refractory Pyrite in pyritic ores contains negligible to low levels of submicroscopic gold <5 ppm Other reasons for refractory behaviour in pyritic ores include very fine grained native gold inclusions in pyrite or the presence of gold bearing tellurides.

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oxidation of gold ores in uganda

A refractory gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes These refractory ores require pre treatment in order for cyanidation to be effective in recovery of the gold A

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Atmospheric alkaline pre oxidation of refractory sulphide

Abstract Refractory gold ores and concentrates are characterised by low gold recoveries and high cyanide consumptions when subjected to direct cyanide leaching Therefore an oxidation pretreatment Expand 42 Highly Influential View 18 excerpts references background and methods Save Alert.

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A Review of Pretreatment Methods to Separate the Different

26 09 2013  This review is an evaluation of the separation processes of different sulfides available in the recent literature for refractory gold ores All major pretreatment processes have been analysed and recommendations have been put forward for further research and development.CITATION John J Johnson N W Stewart K Turner D and Bradshaw D 2013.

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Gold extraction

The challenge of attaining economic extraction of gold from refractory ores is one of the main challenges in the mining industry today as less refractory ores become more depleted It is thus important to properly select an extraction method for refractory ores based on mineralogy precious metal grades gold to sulphur ratios and hazardous impurities Mark Aylemore 2008 .

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pressure oxidation refractory gold

PRESSURE OXIDATION OF REFRACTORY GOLD ORES THE 2014 10 1 Pressure Oxidation Pressure oxidation is employed to liberate gold and silver in refractory sulfi

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Carbon in Chlorine Treatment of Refractory Gold Ores

The U.S Department of Interior Bureau of Mines is investigating the treatment of refractory gold ores Chlorination in the treatment of refractory gold ores is applicable in many low grade gold operations When usable this treatment provides an economic means of consuming sulfides and deactivating disseminated organic carbon Chlorination however is a pretreatment technique that requires

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Ore Treatment Refractory

The Treatment Of Refractory Ores Review pretreatment process on refractory gold ores the treatment Of refractory ores mr jas shedlock with the assistance of mr denny of australia has constructed on behalf of the metallurgical syndicate of 105 gresham house london an apparatus on a commercial scale which it is said effects at the smallest expense and with the best economical

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280 RECENT ADVANCES IN THE TREATMENT OF REFRACTORY

oxidation as a pretreatment method for refractory gold ores has been published by Berezowsky and Weir 6 According to them the first patent on the use of pressure leaching for preoxidation of arsenical gold ores was granted to the Chemical Construction Company Chemico in 1955 7 Two

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gold treatment refractory

17 01 2010  gold treatment refractory Refractory Gold Ore Treatment MethodsMetallurgical ContentGold Leaching Processing of Arsenic OreMispickel Arsenopyrite FeAsS.6Leaching and Recovering Gold from Antimony MineralsStibnite

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Gold Leaching from Refractory Ores Literature Survey

27 04 2007  This review is essentially an overview of the pretreatment processes for the refractory gold ores available in the recent literature When gold is finely disseminated in sulphides arsenosulphides tellurides carbonaceous and clayey materials direct alkaline cyanidation is not effective for gold extraction.

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Alkaline sulfide pretreatment of an antimonial refractory

This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore In the ore gold occurs mainly as gold silver alloys and as associated with quartz and framboidal pyrite grains and to a small extent as the inclusions within antimonial sulfides Silver is present extensively as antimonial sulfides such as andorite.

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Biooxidation of Gold Silver and Antimony Bearing Highly

04 11 2014  Finally this study provides one of the very few available comparisons of the effectiveness of different pretreatment techniques for refractory gold ore concentrates Compared with other abiotic pretreatment approaches roasting pressure oxidation and alkali dissolution biooxidation was shown to be one of the most effective options in terms of the recovery of Au and Ag.

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FLOWSHEET DEVELOPMENT FOR GOLD OREBODIES

refractory ores The mining industry uses a rule of thumb of 80 gold recovery to define the transition from a refractory to a non refractory gold ore Ones under 80 are considered refractory In assessing the economic benefit of the extra processing that must be done to improve recovery from refractory or partially refractory ores one

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Leaching Guide of Refractory Gold Ore

28 02 2020  1.What Is Refractory Gold Ore With the development of beneficiation technology the definition of refractory gold ore is changing Generally speaking refractory gold ore in leaching field is a kind of ore whose leaching rate of gold is less than 80 when directly processed by

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refractory gold processes

Pretreatment Process on Refractory Gold Ores with As Xin yuan NAN Xin CAI and Jun KONG School of Electrical Engineering Xinjiang University 1230 Yan an Road ECONOMICS OF REFRACTORY GOLD ORE PROCESSES ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E Litz and R Wayne Carter 119th TMS Annual Meeting February 18 22 1990 Hazen

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Microbial Pre treatment of Double Refractory Gold Ores

In this study microbial pre treatment of double refractory gold ore sample A and concentrate sample B was investigated using a white rot fungus Tramestes versicolor ATTC 20869 Pulp density temperature pH and retention times were the process variables considered.

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refractory ore gold and pretreatment

Refractory Gold Ore Treatment Methods The later development of flotation for gold ores has in most cases provided a satisfactory pretreatment and has been applied in several ways Flotation removes most of the freed carbon with the concentrate which is then roasted prior to cyanidation or shipped to a smelter McIntyre using flotation

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Efficiency of using sulpuric acid when pretreating

Efficiency of using sulpuric acid when pretreating refractory ores to increase gold recovery Products As a leading global manufacturer of crushing grinding and mining equipments we offer advanced reasonable solutions for any size reduction requirements including Efficiency of using sulpuric acid when pretreating refractory ores to increase gold recovery quarry aggregate and different

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Refractory Gold Pressure Oxidation Technology at Campbell

of ore at the Lihir gold mine in Papua New Guinea commissioned in 1997 In addition Sherritt had conducted process development studies for Homestake s McLaughlin Mine operation in California which had come on stream in 1985 for the treatment of refactory gold ore Refractory Gold Pressure Oxidation Technology at Campbell Mine

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Application Note Refractory Gold Pretreatment

Refractory Gold PretreatmentpH Mining Gold Processing Refractory gold ores are defi ned as containing minerals or carbon compounds that trap encapsulated gold and make leaching extraction diffi cult These types of ores require pretreatment prior to cyanidation Options for pretreatment include the following processes Roasting

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