copper leaching chemistry

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Copper extraction - Wikipedia

Some supergene sulfide deposits can be leached using a bacterial oxidation heap leach process to oxidize the sulfides to sulfuric acid, which also allows for simultaneous leaching with sulfuric acid to produce a copper sulfate solution. As with oxide ores, solvent extraction and electrowinning technologies are used to...

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Heap leaching - Wikipedia

The acid is recycled from the solvent extraction circuit (see solvent extraction-electrowinning, SX/EW) and reused on the leach pad. A byproduct is iron(II) sulfate, jarosite, which is produced as a byproduct of leaching pyrite, and sometimes even the same sulfuric acid that is needed for the process.

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Agitated Copper Leaching & Cementation Process - 911 Metallurgist

May 25, 2017 ... Copper Leaching and cementation process of copper problem: The treatment of copper ores, both oxides and sulfides by means of flotation, hydrometallurgy or other processes has been well established for many years. Flotation has been applied generally to the treatment of sulfide ores, both in small and...

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Copper leaching from primary sulfides: Options for biological and ...

The primary sulfide minerals of copper have been difficult to leach for the purpose of direct copper extraction. In particular, chalcopyrite has been observed to undergo a type of “passivation” under a variety of oxidative leaching conditions. Over the last 10–15 years, a variety of biological and chemical leaching processes...

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Leaching copper from its ores - Journal of Chemical Education (ACS ...

Leaching copper from its ores. John D. Sullivan. J. Chem. Educ. , 1931, 8 (5), p 829. DOI: 10.1021/ed008p829. Publication Date: May 1931. Note: In lieu of an abstract, this is the article's first page. Click to increase image size Free first page. View: PDF | PDF w/ Links. Citing Articles; Related Content. Citation data is made...

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The Chemistry of Copper Heap Leaching | Dissolution (Chemistry ...

The Chemistry of Copper Heap LeachingJohn Dreier November, 1999 Introduction Between 1980 and 2000, primary copper produced b...

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STUDIES ON THE CURING AND LEACHING ... - Open Collections

existing mathematical models of heap leaching. Sulfuric acid curing is a pretreatment to accelerate the extraction kinetics of copper ores and is widely used in copper operations. The curing process involves the addition of a highly concentrated sulfuric acid to the copper ore during agglomeration. Then, chemical reactions...

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Cu Leaching Using Regenerated Ferric Sulphate - SGS

high-grade copper feeds are prohibitive, unless the resulting ferrous sulphate is reoxidized and reused. A plant recently commissioned in Australia employs an autoclave for that purpose. This paper describes a novel approach, called the “Regenerated Ferric Sulphate Leaching (RFSL) process, in which the reoxidation of...

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Cyanide Leaching Of Gold - Mine Engineer

These "extra" elements in the mineral compounds will often play havoc with a chemical reaction, as illustrated above. Copper is definitely worth mentioning, since copper minerals will dissolve in cyanide solutions, and cause a increased use of cyanide, the copper-cyanide complexes formed by the dissolution will tend to...

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In-situ leaching recovery of copper: what's next? | SpringerLink

Abstract. The recovery of mineral and metal values by solution mining has been practiced for centuries. What appears at first glance to be a simple, empirical technique, is in actuality a very complicated process involving a large number of critical parameters that encompass several scientific and engineering disciplines.

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Applying Softcomputing for Copper Recovery in Leaching Process

Oct 30, 2017 ... The mining industry of the last few decades recognizes that it is more profitable to simulate model using historical data and available mining process knowledge rather than draw conclusions regarding future mine exploitation based on certain conditions. The variability of the composition of copper leach...

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LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY FOR ...

Dec 14, 2016 ... The basic copper carbonate minerals, which are easily leached with the solution of sulphuric acid are: azurite, malachite and chrysocolla. Cuprite, tenorite and elemental copper, which are also found in ore deposits of copper, can be converted into a soluble form by leaching, where the chemistry of the.

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Copper leaching from primary sulfides: Options for biological and ...

Dec 19, 2017 ... The primary sulfide minerals of copper have been difficult to leach for the purpose of direct copper extraction. In particular, chalcopyrite has been observed to undergo a type of “passivation” under a variety of oxidative leaching conditions.Over the last 10–15 years, a variety of biological and chemical...

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LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE ...

KINETICS AND CATALYSIS; REACTION ENGINEERING; AND MATERIALS SCIENCE. LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE SOLUTIONS AND PRODUCTION OF COPPER OXIDE. A. Ekmekyapar. N. Demirkıran. A. Künkül. E. Aktaş. 1Department of Chemical Engineering, Faculty of Engineering,...

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A statistical approach to the experimental design of the sulfuric acid ...

The high grade of copper in the Igarapé Bahia (Brazil) gold-copper ore prevents the direct application of the classic cyanidation process. Copper oxides and sulfides react with cyanides in solution, causing a high consumption of leach reagent and thereby raising processing costs and decreasing recovery of gold. Studies...

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Copper Mining Using Acidothiobacillus - microbewiki

The isolation of copper metal from leach liquor is a two-step process (Wikipedia: Copper Extraction Techniques [3]). The leach liquor obtained after heap irrigation has a very low concentration of copper dissolved into it, around 0.5 - 2.0 g/L. Through solvent extraction...

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Copper Removal from Sulphuric Leaching ... - Técnico Lisboa

Centre of Chemical Processes, Technical University of Lisbon, Instituto Superior Técnico,. Av. Rovisco Pais, 1049-001 Lisbon, Portugal. ABSTRACT. The purpose of this work was to study the cementation of copper with zinc from a sulphate leaching solution produced from a zinc sulphide concentrate. Initially, cementation...

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Influence of Ferric and Ferrous Iron on Chemical and Bacterial ...

ABSTRACT. The effects of ferrous and ferric iron as well as redox potential on copper and iron extraction from the copper flotation concentrate of Sarcheshmeh, Kerman, Iran, were evaluated using shake flask leaching examinations. Experiments were carried out in the presence and absence of a mixed culture of moderately...

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COPPER ORE HEAP LEACHING NG Barton! - Mathematics in Industry

Heap leaching of ore is becoming more important as a cost effec- tive means of metal extraction. Important metals like copper and gold are produced by this process. In this report, we study chemi- cal and physical processes in heap leaching in order to gain a better understanding of leach heaps. These processes are...

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Recycling gold and copper from waste printed circuit boards using ...

Chlorination is a feasible alternative for the recovery of metallic elements due to the higher dissolution rate, non-polluting character and selective leaching of different metals by controlling the redox potential. In the present study, an efficient and less-polluted chlorination process to recycle gold and copper from waste PCBs...

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LEACHING OF LOW-GRADE COPPER ORES: A CASE STUDY FOR ...

Dec 14, 2016 ... The basic copper carbonate minerals, which are easily leached with the solution of sulphuric acid are: azurite, malachite and chrysocolla. Cuprite, tenorite and elemental copper, which are also found in ore deposits of copper, can be converted into a soluble form by leaching, where the chemistry of the.

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Copper Mining and Extraction: Oxide Ores - Copper Development ...

The flowchart above shows how the smelting process of sulfide ores produces sulphur dioxide, which is converted to sulfuric acid. The chart below shows how acid is used to leach out copper ions creating lakes of blue copper sulfate solution from which copper is...

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Pyrite Leaching Behaviour under CESL Process Conditions H ... - Teck

Pyrite Leaching Behaviour under CESL Process Conditions. H. Salomon-De-Friedberg. Teck Resources Limited. 12380 Horseshoe Way. Richmond, B.C., Canada V7A 4Z1. (henry.salomon-de-friedberg@teck.com). ABSTRACT. The amount of pyrite in copper concentrates fed to the CESL Process can vary appreciably.

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Outotec® Copper Pressure Leaching Process

Get sustainable and economical copper recovery from copper sulfides with very high copper leach extractions. The Outotec copper pressure leaching process combines our highly effective pressure oxidation and leaching technology with world-renowned VSF solvent extraction and electrowinning technology. The process...

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Microbial Leaching (Bioleaching, Biomining) - Environmental ...

Microbial leaching is the process by which metals are dissolved from ore bearing rocks using microorganisms. For the last 10 centuries, microorganisms have assisted in the recovery of copper dissolved in drainage from water. Thus biomining has emerge as an important branch of biotechnology in recent years. Microbial...

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Agglomeration Drums in the Heap Leaching Process

Heap leaching, a process by which metals such as gold and copper are recovered from ore, has long been a method of choice in ore beneficiation, with applications growing all the time. While this process has proven to be efficient, often chosen for its cost-effectiveness, the efficiency of the heap leaching process can be...

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A mathematical model of the chemistry of the dump leaching of ...

Ideally, accurate predictions of leaching performance would be made for the multi-year lifespan of a dump leaching operation. In the work presented here, the effects of various chemical factors on the dump leaching of chalcopyrite are considered. This is the rnost abundant copper sulfide mineral undergoing leaching (43)...

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Statistical Evaluation of Factors Affecting the Leaching Process of ...

Mar 2, 2015 ... This study aims to provide an alternative process for the dissolution of metals from WEEE which contains Cu and Zn based on our previous research. The effects of leaching parameters, such as temperature, Na2S2O8 concentration, and leaching time, were separately investigated on leaching of copper,...

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An Investigation into the Effect of Temperature on the Leaching of ...

Leaching tests indicated that Cu recovery increased in the temperature range 50˚C - 60˚C, however at a temperature of 70˚C Cu recovery decreases because of cementation process as nickel displace copper. The shrinking core model was used to determine if the leaching process was diffusion controlled, or chemical...

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Leaching and electrochemical recovery of copper, lead and tin from ...

Department of Chemical and Process Engineering, University of Newcastle, Merz Court, Newcastle upon Tyne NE1 7RU, UK. Abstract: The recovery of copper, lead and tin from scrap printed circuit boards (PCBs) has been achieved using a combination of leaching, electrochemical ion exchange and electrodeposition. A.

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Maximizing copper recovery with innovative ROL technology ...

Feb 17, 2016 ... FLSmidth recently signed a joint agreement with BASF to expedite the commercialization of the new FLSmidth® Rapid Oxidative Leach process. Originally announced to the mining industry back in May, our combined teams continue to develop this exciting breakthrough technology.

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is there a green chemistry approach for leaching gold?

May 26, 2005 ... Breurer, P. L. and Jeffrey, M. I., 2003. Copper Catalysed Oxidation of Thiosulfate by Oxygen in. Gold Leach Solutions. Minerals Engineering 16(1): 2 1-30. Bucknam, C. H., 2004. A Green Chemistry Approach to Mercury Control during Cyanide. Leaching of Gold. Preprint 04-101, SME Annual Meeting, Feb.

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Applying Softcomputing for Copper Recovery in Leaching Process

Oct 30, 2017 ... 1Department of Chemical Engineering, Universidad Xinhaiólica del Norte, Angamos Av. 0610, Antofagasta, Chile 2Department of Computing & Systems Engineering, Universidad Xinhaiólica del Norte, Angamos Av. 0610, Antofagasta, Chile 3Department of Chemical and Environmental Engineering, Universidad...

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Copper Chemistry

Hydrometallurgical Method -SX/EW Solvent Extraction / Electrowinning is the most dominant leaching process used today in the recovery of copper from chemical solutions. As the name suggests the method involves two major stages: Solvent Extraction- the process by which copper ions are leached or otherwise extracted...

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COPPER(II) EXTRACTION FROM AMMONIA LEACH SOLUTION

Received July 3, 2013; reviewed, accepted July 26, 2013. COPPER(II) EXTRACTION. FROM AMMONIA LEACH SOLUTION. Katarzyna OCHROMOWICZ, Magdalena JEZIOREK, Katarzyna WEJMAN. Wroclaw University of Technology, Faculty of Chemistry, Division of Chemical Metallurgy, Wybrzeże. Wyspiańskiego 23...

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Acid Pressure Leach Process for Copper Removal - J-Stage

Acid Pressure Leach Process for Copper Removal*. ' Autoclave processing of low-grade molybdenite concentrates (1st Report) ' by Rinat MIRVALIEV. 1 and Katsutoshi INOUE. 2. The conditions for the selective oxidation of copper and iron sulfide minerals contained in a low-grade molybdenite concentrate during autoclave...

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SART for copper control in cyanide heap leaching

SART involves acidification with addition of soluble sulphide, separation of the resulting copper sulphide precipitate, and addition of lime to re-establish alkalinity prior to returning the solution to the leaching process, recovering both copper and cyanide as valuable products. In principle SART is very simple. Yet some SART...

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Application of SART to Heap Leaching of Gold-Copper

Kinross Gold Corporation's Maricunga mine in Chile presents an ideal opportunity to apply the SART process to a heap leach operation. Given increasing levels of cyanide complexed copper in current pregnant solutions from. Maricunga heaps (over 300 ppm Cu), there is a need to reduce these levels and decrease...

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Optimization of Acid Leaching of Copper from Contaminated Soil

Feb 18, 2013 ... Leaching of Copper from Contaminated. Soil. Master of Science Thesis in the Master Degree Programme, Chemistry and Bioscience. ANNA ERIKSSON. PER JOHANSSON. Department of Civil and Environmental Engineering. Water Environment Technology. CHALMERS UNIVERSITY OF TECHNOLOGY.

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Hydro-mechanical-chemical coupled modeling of copper heap ...

Apr 24, 2014 ... Heap leach pads constitute a common practice in the mining industry. In their design and management it is not common to take into account criteria based on coupled hydro-mechanical-chemical (HMC) processes, and these are of paramount importance for two reasons: (i) they could play an important role...

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