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MICROBIAL PRE TREATMENT OF DOUBLE REFRACTORY GOLD ORES

of double refractory gold ores and concentrates Currently numerous studies are in progress to further improve upon the efficiency of the bacterial process and to investigate the potential of other microorganisms In this study microbial pre treatment of double refractory gold ore sample A and

Refractory ore

Other articles where Refractory ore is discussed gold processing Extraction from refractory ores Many gold bearing ores and concentrates are not readily amenable to cyanidation owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold preferentially adsorb the gold as it dissolves a phenomenon called preg robbing or completely surround the

Review of gold extraction from ores

In Australia the two pre eminent options for refractory gold ore pretreatment are roasting and biooxidation and this development is reported The trial of pressure cyanidation of stibnite concentrates at the Golden Spec mine in Australia is described Pyrolysis

Pretreatment Of Refractory Ores In Gold Leaching Process Congo

refractory ore gold and pretreatment pretreatment of refractory ores prior to gold leaching new crushing refractory ore gold and pretreatment Read more gold processing flow diagram refractory ore pretreatment processes in gold recovery by thiosulphate leaching.

USA1

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media USA1Microbial pre treatment of double refractory gold oresGoogle Patents Microbial pre treatment of double refractory gold ores Download PDF Info Publication number

GLOBAL EXPLOITATION OF HEAP LEACHABLE GOLD DEPOSITS II

Bioheap pretreatment of sulfidic refractory gold ore prior to cyanide leaching is a promising new technology especially for low grade ores that cannot be oxidized by pressure leaching or roasting Ores containing both refractory and amenable gold require economic decisions whether or not to pretreat before cyanide leaching.

The reasons of gold refractory Gold ore classification

28 11 2016  III 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

Barben Analytical

Gold Processing Refractory Sulfide Ores pH/ORP Refractory gold ores are defined 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 The pH measurements in the scrubber are typically used to control the process.

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.

Refractory and Non Refractory Ore

Refractory and Non refractory are relative terms and the degree to which any ore is amenable to cyanide extraction will range from near 0 through to near 100 Whether gold is refractory or non refractory has a huge bearing on a potential mine s viability.

ACID OXIDATION PRETREATMENT OF REFRACTORY GOLD ORE

A process for recovering gold from refractory auri ferous iron containing suiphidic ore comprising feeding ground ore as an aqueous slurry to an acidic pretreatment step treating the ground ore in the acidic pretreatment step with aqueous sulphuric acid solution to decompose car bonate and acid consuming gangue compounds which might other wise inhibit a subsequent pressure oxidation step

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

Method for Pre Treatment of Gold Bearing Oxide Ores

27 05 2014  Fine carbon can be added separately or inter ground with the ore TABLE 4 Gold Test # Test Description Extraction 1 CIL cyanide leaching 90.1 2 Thiosulfate leaching 57.4 3 Pretreatment of 150 g ore with 75 g 82.9 coarse activated carbon followed by thiosulfate leaching 4 Pretreatment of 150 g ore with 1.5 g 75.6 ground activated carbon

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 .

Refractory Ore Gold And Pretreatment 2012 Zimbabwe

Refractory Ore Gold And Pretreatment 2012 Zimbabwe Gold cyanidation Wikipedia Gold Ore Processing Project Development and Operations Second Edition brings together all the technical aspects relevant to modern gold ore processing offering a practical perspective that is vital to the successful and responsible development operation and closure of any gold ore processing

Process for Recovering Gold

Refractory gold ore pretreatment operations continue to attract attention as surface oxide ores are near depletion and deep seated sulphide deposits are increasingly encountered Refractory ores are difficult to process as are copper gold feedstocks hence recovery from these types of gold bearing raw materials can be low.

Refractory Ore Gold And Pretreatment

Gold Extraction Queensminedesignwiki Figure 5refractory ore pretreatment options order to choose a pretreatment option for a refractory ore the main concern is attaining a solution which succeeds in preparing the ore for cyanidation whilst remaining economically feasible.Mill sizing.The ore throughput rate of a mill is largely dependent on the mining production rate.

Refractory and Non Refractory Ore

Refractory and Non refractory are relative terms and the degree to which any ore is amenable to cyanide extraction will range from near 0 through to near 100 Whether gold is refractory or non refractory has a huge bearing on a potential mine s viability.

Leaching of a Refractory Gold Ore Sample from the Central

A cyanidation study was conducted on a mild refractory gold ore sample from the Central zone of Clarence Stream Property owned by Freewest Resources Canada to develop a leaching strategy to extract gold Gold at a grade of 8.00 g/t is present as native gold electrum and aurostibite The ore also contains 2.8 per cent pyrrhotite together with several antimony minerals 0.8 per cent

Effect of Pretreatment of Sulfide Refractory Concentrate

For extraction of gold from refractory ores or concentrate in which gold is surrounded or covered by iron sulfide minerals mainly arsenopyrite and pyrite mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold to the leaching solution.

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

Mineralogical factors affecting the extraction of gold in

For refractory gold ore processing pretreatment technologies such as fine grinding autoclaving roasting and biooxidation will also be required The reason for using different process flowsheet is mainly because gold often occurs in different forms and minerals and each ore has to be treated differently Mineralogically gold is classified

treatment of refractory ores

Microwave pretreatment of a double refractory gold ore Abstract Double refractory gold ores such as Barrick s Goldstrike ore contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic

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refractory gold ore for increasing the leaching rate 5 7 In the existing technical conditions pretreatment of refractory gold ore is usually carried out by calcination wet chemical pressurized oxidation and biological

Comparison of different extraction methods to determine

In nature gold occurs as native or refractory type Refractory gold ores are not free milling and cannot be leached without some form of physical chemical or pyro metallurgical pretreatment Refractory gold is found in association with sulphides pyrite arsenopyrite and chalcopyrite whereas native gold is

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

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.

How to Improve the Refractory Gold Leaching Process

18 08 2020  Pretreat the refractory gold 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 1

Mineralogical analysis of the refractory arsenical gold

refractory arsenical gold ore by using scanning electron microscopy SEM X ray diffraction XRD and diagnostic leaching is presented The mineralogical analysis of the ore indicates mainly the presence of arsenopyrite pyrite and quartz The conventional cyanidation tests showed that the gold extractions with grain size of P 90

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

Method for Pre Treatment of Gold Bearing Oxide Ores

27 05 2014  Fine carbon can be added separately or inter ground with the ore TABLE 4 Gold Test # Test Description Extraction 1 CIL cyanide leaching 90.1 2 Thiosulfate leaching 57.4 3 Pretreatment of 150 g ore with 75 g 82.9 coarse activated carbon followed by thiosulfate leaching 4 Pretreatment of 150 g ore with 1.5 g 75.6 ground activated carbon

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.

Atmospheric alkaline pre oxidation of refractory sulphide

Atmospheric alkaline pre oxidation of refractory sulphide gold ores Creator Rego Alan Joseph Publisher University of British Columbia Date Issued 2018 Description Four iron sulphide containing gold ores from the White Mountain mine in the Jilin Province China were studied to examine the benefits of using oxidative treatment prior to