the bioleaching and processing of refractory gold ore



Refractory Gold Technology

Refractory Gold Technology Sherritt s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks Many gold ores and concentrates contain fine grained gold locked within sulphide minerals such as pyrite and/or arsenopyrite unavailable for recovery by conventional leaching In Sherritt s gold process the

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Potential pre treatment and processing routes for recovery

2.1 Microwave pre treatment of refractory gold ores Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting pressure leaching or bacterial leaching to render the gold amenable to recovery by subsequent treatment techniques Haque 1987 .

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Options to Treat Refractory Ores

A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves.

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Extraction of gold from an Indian low grade refractory

The work carried out on the processing of a low grade and refractory gold ore using thiourea is presented Direct leaching of the as received ore with thiourea has yielded only 16 gold extraction Starting with ore containing 1.4 g/t of gold it has been possible to generate a sulphide concentrate with 6.1 g/t of gold by physical beneficiation of the ore through froth flotation.

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Microbial Leaching Bioleaching Biomining

Gold and Silver Leaching Today s microbial leaching of refractory precious metal ores to enhancegold and silver recovery is one of the most promising applications Gold is obtained through bioleaching of arsenopyrite/pyrite ore and its cyanidation process Silver is more readily solubilized than gold during microbial leaching of iron sulfide.

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refractory gold ore heap leaching

The bioleaching and processing of refractory gold ore 2017 8 26The Bioleaching and Processing of Refractory Gold Ore Nicholas S Lynn The refractory ore is crushed agglomerated and stacked Microor biooxidize The heap or vat is then processed ei ther by cyanide heap leaching or milling.

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Methods of Processing of the Gold Containing Refractory

Key words thiocarbamide method electrochemical processing gold containing ores flotation tails barite polymetallic ore thiourea Analysis of literary data shows that in gold min ing the main method of gold extraction from ores and concentrates is cyanidation which is not cost effec tive in case of the refractory sulfide ores Neutraliza

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Gold Mining Process Development Denver Mineral Engineers

REFRACTORY ORE PROCESSING The common definition of refractory gold ores are those ores that do not allow the recovery of gold by standard gravity concentration or direct cyanide leaching One major category of refractory ores are gold values contained within the crystalline structure of sulfide minerals such as pyrite and arsenopyrite.

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Bioleaching and Biomining

Gold and Silver Leaching Microbial leaching of refractory process metal ores to enhance gold and silver recovery is one of the promising applications Gold is obtained through bioleaching of arsenopyrite/ pyrite Silver is also obtained by bioleaching of arsenopyrite but it is more readily

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The Bioleaching And Processing Of Refractory Gold Ore

Bioleaching is used today in commercial operations to process ores of copper nickel cobalt zinc and uranium whereas biooxidation is used in gold processing and coal desulfurization It was demonstrated that biooxidation pretreatment of refractory whole ores could be conducted in heaps.

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Assessment of the Possibility of Hydrometallurgical

Gold leaching of oxidized copper refractory ore Tarror mineral deposit demonstrated low gold recovery by direct cyanidation The reason was the high copper content present because it forms stable copper cyanic complexes Application of ammonium compounds to oxidized ores provides high rates of gold recovery and prevents the formation of copper

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Refractory and Non Refractory Ore

Non refractory ore is where cyanide can be used to extract the gold This is desirable as it means the process will be cheaper 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 .

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Bacterial Oxidation of Refractory Sulfide Ores for Gold

27 09 2008  Gold is finely disseminated in refractory sulfide ores thereby decreasing Au recoveries upon conventional cyanidation for gold dissolution In the bioleaching process bacteria remove the sulfide minerals by oxidative dissolution and thus expose Au to extraction with cyanide solution.

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Bioleaching of Gold Ore Essay

02 11 2009  Bioleaching of Gold Ore Table of Contents Title Page i Table of Contents ii ABSTRACT iii 1 INTRODUCTION 4 2.1 HISTORICAL OVERVIEW OF BIOLEACHING 4 5 2.2 TYPES OF BIOLEACHING 5 7 2.3 GOLD ORES APPLICABLE TO BIOLEACHING 7 2.4 PRINCIPLES OF BIOLOGICAL GOLD ORE TREATMENT 7 9 2.5 OPTOMIZING THE BIOLEACHING PROCESS 9 11 2.6 ADVANTAGES OF BIOLEACHING OF GOLD ORE

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Optimization of bioleaching and oxidation of gold bearing

Optimization of bioleaching and oxidation of gold bearing pyrite arsnopyrite ore concentrate in batch mode Article Biooxidation of refractory gold bearing pyrite arsenopyrite flotation concentrate was optimized and aburidance of predominant groups in the community ofthermophilic acidophilic chemolithotrophic microorganisms at various

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PDF Biooxidation of sulfidic refractory gold ores

The typical gold recovery of the process is 90 95 whereas it works at a variety scales from 30 1000t concentrate/day The process is modular making a later expansion of the plant possible It is also considered able to treat a variety of ore types through the lifetime of a project from transition ores to fully refractory ores.

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Gold Process Mineralogy

refractory gold minerals locking of submicroscopic gold in sulfide and sulfarsenide mineral structures Gold process mineralogy address all issues related to gold ore processing by the detailed study of an ore or a mill product The methodology is widely used as a predictive tool in feasibility studies and during the process

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Assessment of the Possibility of Hydrometallurgical

Gold leaching of oxidized copper refractory ore Tarror mineral deposit demonstrated low gold recovery by direct cyanidation The reason was the high copper content present because it forms stable copper cyanic complexes Application of ammonium compounds to oxidized ores provides high rates of gold recovery and prevents the formation of copper

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Bioleaching technology in minerals processing

today processing refractory gold concentrates from several mines in the area Tank bioleaching of refractory gold concentrates has since found widespread application in South America Asia Africa and Australia An industrial bioleaching plant for the treatment of a refractory gold concentrate At the Beaconsfield Gold

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processing refractory gold ores

process for treating refractory gold ores by roasting under roasting temperature of 500° to 525°c and a residence time of30 min key words gold roasting oxidation

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Refractory Gold Ore Treatment Methods

14 07 2016  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

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Biomining metal recovery from ores with microorganisms

Bioleaching is a conversion of an insoluble valuable metal into a soluble form by means of microorganisms In biooxidation on the other hand gold is predominantly unlocked from refractory ores in large scale stirred tank biooxidation arrangements for further processing steps In addition to copper and gold production biomining is also used

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Acid leaching decarbonization and following pressure

16 07 2016  Carbonate decomposition of carbonic refractory gold ore and the following pressure oxidation were studied In the carbonate decomposition procedure the effects of liquid to solid ratio and reaction time on decomposition ratio of carbonate were investigated The experimental result shows that the decomposition ratio of carbonate is 98.24 under the conditions of liquid to solid ratio of 5 1

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Microbes and mineral recovery Bioleaching of copper gold

The leaching of sulfide minerals distinguishes bioleaching from conventional acid leaching Bioleaching involves the use of microorganisms to catalyze the oxidation of iron sulfides to create ferric sulfate and sulfuric acid Bioleaching is used today in commercial operations to process ores of copper nickel cobalt zinc and uranium.

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PDF Bioleaching of Metals from Sulphidic Minerals

The only demonstration bio oxidation plant for the refractory gold ore was commissioned in 2001 in Karnataka Natarajan et al 2001 A pilot scale bioleaching process is reported to treat polymetallic bulk concentrate Tipre 1999 Tipre and Dave 2004 .

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The Bioleaching And Processing Of Refractory Gold Ore

The Bioleaching And Processing Of Refractory Gold Ore Mineral Processing Equipment the bioleaching and processing of refractory gold oreA type of mining equipment that can trigger the development and change of the beneficiation technology industry.The main core machines are ball mills rod mills flotation machines magnetic separators etc.

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Gold extraction

Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution mineral processing hydrometallurgical and pyrometallurgical processes to be performed on the ore. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing resulting in direct recovery of

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Minerals

These include i extracting and recovering metals principally copper from low grade/run of mine ores ii bioleaching primary and secondary copper sulfide ores in sites where solvent extraction electrowinning SX EW plants have previously been installed for processing pregnant leach solutions PLS from acid leaching of copper oxide ores iii for bio oxidising refractory gold ores.

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TECHNOLOGY FOR PROCESSING OF REFRACTORY GOLD

disseminated gold from the flotation concentrate resulted from processing of a refractory ore of one of Russian gold deposits Concentrate description Gold grade of the head flotation concentrate was 29.6 g/t The concentrate size was 80 80 um Mineral composition of the concentrate comprises 17 of rock forming minerals 59 of pyrite and 24

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Study on the Gold Recovery of Double Refractory Gold Ore

The main carbonaceous substances were elemental carbon which the morphology was dense and similar to graphite The removal rates of iron arsenic and sulfur were achieved to 93.78 97.02 and 95.54 respectively by bioleaching and the gold recovery of oxidation residue reached 92.34 by carbon inhibited cyanide leaching process.

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Review Pretreatment Process on Refractory Gold Ores with As

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 Tianshan District Urumqi 830047 P R China Received on August 30 2013 accepted on October 17 2013

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Studies on the bioleaching of refractory concentrates

Bioleaching is now an established technology for the pre treatment of refractory gold ores and concentrates and the leaching of whole ore copper heaps In many cases it offers economic environmental and technical advantages over pressure oxidation and roasting1 2 However in order for bioleaching to compete successfully with other pre

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PDF Application of Diagnostic Leaching Technique for

Application of Diagnostic Leaching Technique for Refractory Gold Ores Ibrahim Alp Related Papers Evaluation of Refractory Behaviour of Kaletaş Turkey Gold Ore By ibrahim alp Characterization of refractory behaviour of complex gold/silver ore by diagnostic leaching.

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