IN SITU RECOVERY SMI SEMINARfinal1
1 INSITU RECOVERY OF METALS Nenad Djordjevic UQ . 1 INSITU RECOVERY OF METALS Nenad Djordjevic UQ
Chalcopyrite Leaching Metallurgist & Mineral Processing
Leaching Chalcopyrite is the holy grail for hydrometallurgists (Leachers), difficult to leach as the sulfur forms a layer over the mineral and makes the leaching slow. Having said that, it is not not leachable, not unusual for ore dumps (low grade) containing chalcopyrite to be placed under leach but report low recovery +/30% TCu over several years and the rate is around 0.51% per month
Copper Ore Types: Sulfides vs. Oxides An Investor''s
Copper Ore Types: Sulfides vs. Oxides. be leached using a bacterial oxidation heap leach process to oxidize the sulfides to sulfuric acid. of zinc instead of iron ore. Chalcopyrite is also
Minerals Free FullText Assessment of Bioleaching
It is widely known that bioleaching microorganisms have to cope with the complex extreme environment in which microbial ecology relating to community structure and function varies across environmental types. However, analyses of microbial ecology of bioleaching bacteria is still a challenge. To address this challenge, numerous technologies have been developed. In recent years, highthroughput
Rcovery of gold in pyritic ores Mine Engineer.Com
information on pyrtiric gold, leach . Recovery of Gold in Pyritic Sulfide Ores The now extinct Us Bureau of Mines conducted numerous studies of gold in pyrite, and sulfide ores over the years, until their untimely demise in the 1990''s.
Integrated piloting of a thermophilic bioleaching process
Bioleaching of the primary copper sulphide, chalcopyrite, has presented more of a challenge, since the surface of the chalcopyrite tends to passivate at the temperatures and redox potentials found in typical mesophilic bioleach processes, effectively stopping the leaching of the mineral. This behaviour can be overcome by a variety of approaches
Leaching of a lowgrade, coppernickel sulfide ore. 1. Key
Leaching of a lowgrade, coppernickel sulfide ore. 1. Key chalcopyrite and pentlandite ore were acid preconditioning, inoculation and aeration. The results indied solution by substituting 20 L of acidified water with 20 L of bacterial culture. Thus, ore
Pleasecitethisarticleas: Liu,Wenying,Moran,C.J.,Vink, Sue
suggested that the disrupted bacteria cells negatively affected flotation kinetics of chalcopyrite in the simulated ore. dividing chalcopyrite recovery by pyrite recovery) 3.3. Flotation of the real ore In almost all cases, ore deposit that a mine site deals with is more complex that the simulated ore. Real
Bacterial Leaching of Chalcopyrite Ore CORE
The biological leach achieved 65% copper extraction in 160 days. This level of copper extraction is significantly higher than any previously reported results (typically /10% copper extraction) and represents a significant advance in the bacterial leaching of chalcopyrite ore.
Pressure Leaching Of Chalcopyrite Concentrates By Dynatec
Pressure Leaching Of Chalcopyrite Concentrates By Dynatec. Countercurrent twostage pressure leachinghe first twostage zinc pressure leach plant was commissioned in flin flon in the summer of 1993 this plant, employing dynatec zinc pressure leach technology, is operated by hudson bay mining and smelting company, ltd.
Chalcopyrite Mining Overview jonkersland.nl
Leaching Chalcopyrite is the holy grail for hydrometallurgists (Leachers), difficult to leach as the sulfur forms a layer over the mineral and makes the leaching slow. Having said that, it is not not leachable, not unusual for ore dumps (low grade) containing chalcopyrite to be placed under leach but report low recovery +/30% TCu over several
Chalcopyrite Mining Overview jonkersland.nl
Leaching Chalcopyrite is the holy grail for hydrometallurgists (Leachers), difficult to leach as the sulfur forms a layer over the mineral and makes the leaching slow. Having said that, it is not not leachable, not unusual for ore dumps (low grade) containing chalcopyrite to be placed under leach but report low recovery +/30% TCu over several
Biohydrometallurgy and Biomineral Processing Technology: A
Biohydrometallurgy and Biomineral Processing Technology: A Review on its Past, Present and Future. which inhibits the copper recovery in a heap leaching of chalcopyrite by biological methods. Use of extreme thermophiles in chalcopyrite bioleaching is making a revolutionary movement to solve the mystery behind the scaling up the process
Biological Processing: Biological Processing of Sulfidic
Abstract. Biological processing of sulfidic ores and concentrates is a chemical system alyzed by microorganisms. The technology is commercially applied in runofmine stockpiles, crushed ore heap leaching plants, and continuous stirred tank reactors (CSTRs).
Leaching, Washing, Or Dissolving Patents and Patent
Also disclosed is a method of leaching copper from a copper sulfide ore, including leaching copper from an ore including a copper sulfide ore by heap or dump leaching with the use of a sulfuric acid solution containing ferric (III) ions and iodide ions at a total iodine concentration of 8 to 100 mg/L as a leaching
The role of ironoxidizing bacteria in stimulation or
Oct 01, 2000 · A series of bacterial and chemical leaching experiments were conducted to clarify contradictory reports in the literature regarding the role of bacteria in the bioleaching of chalcopyrite. Tests containing a high bacterial concentration showed inhibited leaching, even lower than noninoculated controls.
Copper extraction Wikipedia
Copper extraction refers to the methods used to obtain copper from its ores. The conversion of copper consists of a series of physical and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local environmental regulations, and other factors.
Dr Hong Peng UQ Researchers
Dr Hong Peng is an Amplify Research Fellow after being an Advance Queensland Research Fellow (Earlycareer, 20162019) and Postdoc(20142015) at Rio Tinto Bauxite and Alumina Technology Centre at the University of Queensland (UQ) within the School of Chemical Engineering .
Please cite this article as: Palaniandy, Samayamutthirian
Stirred milling is an enabling technology to process low grade finely disseminated ore bodies. Besides size reduction, stirred mill has the ability to deliver high energy to particles which facilitate crystal structure distortion. High energy stirred milling experiments (up to 300 kWh/t) was carried out on chalcopyrite
Microbial miners Feature Chemistry World
Chalcopyrite ores are too lowgrade for traditional heatbased extraction techniques such as smelting, but they also present a challenge for biomining, because chalcopyrite is fairly resistant to oxidation by ferric iron. It''s very rare for a new ore body to be found that contains a lot of metal. Barrie Johnson
How to Separate Gold from Pyrite
In panning large samples, only one or two specks of gold could be seen, although the ore contained from 1 to 2 ounces per ton. This ore yielded only about 40 per cent, on being amalgamated, but over 90 per cent, was dissolved out by leaching the raw ore with cyanide of potassium, and similar results were obtained by chlorination.
Rcovery of gold in pyritic ores Mine Engineer.Com
information on pyrtiric gold, leach . Recovery of Gold in Pyritic Sulfide Ores The now extinct Us Bureau of Mines conducted numerous studies of gold in pyrite, and sulfide ores over the years, until their untimely demise in the 1990''s.
Mechanism and kinetics of chalcopyrite passivation and
Chalcopyrite was leached almost to completion (95%) within 30 days in the presence of thermophilic bacteria at low potentials and high temperatures. The bioleaching rate of chalcopyrite was further increased with the addition of pyrite. Finally, atmospheric leaching of chalcopyrite was carried out at 80°C under a range of conditions.
Review on Cyanogenic Bacteria for Gold Recovery from EWaste
Electronic waste (Ewaste) is recognized as a new emerging and fastgrowing waste stream, and may be considered as a secondary ore for the recovery of some precious metals (such as gold). A number of control technologies have been conducted for gold recovery, and in which, cyanidation is widely used. In recent years, an alternate approach to the gold cyanidation process is being considered, in
Please cite this article as: Palaniandy, Samayamutthirian
Stirred milling is an enabling technology to process low grade finely disseminated ore bodies. Besides size reduction, stirred mill has the ability to deliver high energy to particles which facilitate crystal structure distortion. High energy stirred milling experiments (up to 300 kWh/t) was carried out on chalcopyrite
Bacterial leaching of chalcopyrite ore / by Home Trove
Bacterial leaching utilises bacteria, ubiquitous to sulphide mining environments to oxidise sulphide ores. The sulphide mineral chalcopyrite is the most common copper mineral in the world, comprising the bulk of the known copper reserves. Chalcopyrite is resistant to bacterial leaching and despite research over the last 2030 years, has not yet been economically bioleached. Attempts have been
Leaching of chalcopyrite concentrate using extreme
LEACHING OF CHALCOPYRITE CONCENTRATE USING EXTREME THERMOPHILIC BACTERIA by MICHAEL GLENN TIMMINS B.Sc.(Hons.), Bishop''s University, 1997 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE STUDIES Department of Metals and Materials Engineering We
Bacterial leaching of chalcopyrite ore (Book, 1998
COVID19 Resources. Reliable information about the coronavirus (COVID19) is available from the World Health Organization (current situation, international travel).Numerous and frequentlyupdated resource results are available from this WorldCat.org search.OCLC''s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus
Isolation and characterization of bacterium for
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Mechanism and kinetics of chalcopyrite passivation and
Chalcopyrite was leached almost to completion (95%) within 30 days in the presence of thermophilic bacteria at low potentials and high temperatures. The bioleaching rate of chalcopyrite was further increased with the addition of pyrite. Finally, atmospheric leaching of chalcopyrite was carried out at 80°C under a range of conditions.
TENORM: Copper Mining and Production Wastes Radiation
Leaching. There are two main leaching methods: heap leaching and insitu leaching. Heap leaching is the most common method used in the U.S. When processing copper through heap leaching, vast quantities of ore and overburden overburdenSoil and rocks that have been moved out of the way to get to ore are called "overburden." In areas where there
Microbial population dynamics of espace.curtin.edu.au
chalcopyrite ore. A mixed culture containing ten known bioleaching microorganisms was used to inoculate four bioleaching columns operated at 60, 50, 40 or 30ºC. Subsequently, Terminal Restriction Fragment Length Polymorphism (TRFLP) was used to examine the diversity of bacterial and
Hydrometallurgy Journal Elsevier
Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties.. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures separation
Bacterial consortium for copper extraction from sulphide
The mining industry is looking forward for bacterial consortia for economic extraction of copper from lowgrade ores. The main objective was to determine an optimal bacterial consortium from several bacterial strains to obtain copper from the leach of chalcopyrite.
Bacterial Leaching Core Group
> Bacterial Leaching Core has extensive experience in testwork relating to bacterially assisted leaching of base metal sulphide and refractory gold ores. Test programmes carried out have included use of a range of bioreactors for oxidation of concentrates and aerated columns for heap leach simulation studies.
Copper extraction Wikipedia
Copper extraction refers to the methods used to obtain copper from its ores. The conversion of copper consists of a series of physical and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local environmental regulations, and other factors.
Recent Developments in Geology, Exploration and Production
Recent developments in geology, exploration and production, which have transformed the economics of the deposit, are the subject of this presentation. Loion and Ownership The Mt Gordon Cu Mine is loed 130 road km north of Mount Isa, Queensland at latitude 19°o 20'' S, longitude 139° 22'' E on the Camooweal (SE 5413) 1:250,000 scale
Bioleaching of copper in tropical systems UQ Researchers
The proposal is focussed on bioleaching of chalcopyrite, to recover copper from currently subeconomic lowgrade ore. Conventional mining processes are too energy intensive to economically extract copper from lowgrade ores. However, these waste ores are still subject to natural, bacterial leaching causing environmental harm.
Randol Paper 3 Albion Process
the North Queensland project to conduct prefeasibility metallurgical testwork on ore samples from the project. The upgraded flotation concentrate samples were tested using pressure oxidation, bacterial oxidation and the Albion Process. Parameters from this testwork provided the basis of the design criteria for the study into a
Bacteria: The mining powerhouse of the future Stories of
A relatively inexpensive method – bioassisted leaching – relies on using adapted microbial cultures that alyse mineral leaching. These diverse bacterial cultures treat lowgrade ores, which is important in the face of highgrade ore depletion.
Percolation Leaching of a ChalcopyriteBearing Ore at
PERCOLATION LEACHING OF A CHALCOPYRITE .BEARING ORE AT AMBIENT AND ELEVATED TEMPERATURES WITH BACTERIA By B. W. Madsen, 1 and R. D. Groves 2 ABSTRACT The Bureau of Mines conducted a largescale (6.4 t), longterm (2,165 days) test to gain a better understanding of the leaching characteris
Leaching of chalcopyrite concentrate using extreme
LEACHING OF CHALCOPYRITE CONCENTRATE USING EXTREME THERMOPHILIC BACTERIA by MICHAEL GLENN TIMMINS B.Sc.(Hons.), Bishop''s University, 1997 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE STUDIES Department of Metals and Materials Engineering We
Pressure Leaching Of Chalcopyrite Concentrates By Dynatec
Pressure Leaching Of Chalcopyrite Concentrates By Dynatec. Countercurrent twostage pressure leachinghe first twostage zinc pressure leach plant was commissioned in flin flon in the summer of 1993 this plant, employing dynatec zinc pressure leach technology, is operated by hudson bay mining and smelting company, ltd.
IN SITU RECOVERY SMI SEMINARfinal1 SlideShare
Feb 09, 2016 · IN SITU RECOVERY SMI SEMINARfinal1 1. 1 INSITU RECOVERY OF METALS Nenad Djordjevic UQ 2. 2 In many Cu mines only 12% of ore are minerals of value 2 Gangue Minerals Cu Concentrate Minerals 22 • Thermophilic bacterial leaching is fast copper can be leached from chalcopyrite before creation of byproducts on the fragments surface
Metal extraction by bacterial oxidation. Free Online Library
A 500,000 t/y twostage heap leach process has been used at Mt Leyshon Gold Mine, 24 km south of Charters Towers, northern Queensland, since August 1992, treating copper/gold ore. The process employs a first stage bacterial heap leach to remove the copper prior to ore neutralisation and a second stage heap leach gold extraction using cyanide.
Sequencing of the rus gene before and after the mutation
Then, the bacteria was transferred into a medium which contained 50% uranium ore to carry out the bioleaching process. After measuring the amount of the extracted uranium, iron, Eh and pH, genomic DNA was extracted to investigate the rusticyanin gene (rus) sequence sent for sequencing after performing PCR.
bacterial leaching of chalcopyrite ore uq espace