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Topic: Copper extraction

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  Copper - LoveToKnow 1911
The principal ores of copper are the oxides cuprite and melaconite, the carbonates malachite and chessylite, the basic chloride atacamite, the silicate chrysocolla, the sulphides chalcocite, chalcopyrite, erubescite and tetrahedrite.
Henry Wilde, in 1875, in depositing copper on iron printing-rollers, recognized this principle and rotated the rollers during electrolysis, thereby renewing the surfaces of metal and liquid in mutual contact, and imparting sufficient motion to the solution to prevent stratification; as an alternative he imparted motion to the electrolyte by means of propeller blades.
Copper arsenate is similar to cupric phosphate, and the resemblance is to be observed in the naturally occurring copper arsenates, which are generally isomorphous with the corresponding phosphates.
www.1911encyclopedia.org /Copper   (11128 words)

 Copper - Encyclopedia, History, Geography and Biography
Copper doorknobs are used by hospitals to reduce the transfer of disease, and Legionnaire's Disease is suppressed by copper tubing in air-conditioning systems.
Copper was associated with the goddess Aphrodite/Venus in mythology and alchemy, owing to its lustrous beauty, its ancient use in producing mirrors, and its association with Cyprus, which was sacred to the goddess.
Copper is found in a variety of enzymes, including the copper centers of cytochrome c oxidase and the enzyme superoxide dismutase (containing copper and zinc).
www.arikah.com /encyclopedia/Copper   (2351 words)

 Hydrometallurgical copper extraction process - Patent 5316567
In a preferred embodiment, the bed of low-grade copper ore or granular rock is in the form of a heap and the percolation leaching comprises heap leaching.
This invention relates to a process for the extraction of copper from copper ore or concentrates, in particular sulphide ores, in which the concentrate is subjected to acid leaching to extract the copper therefrom.
Most copper ores or concentrates from which copper is extracted on a commercial scale contain copper in sulphide form, such as CuFeS.sub.2 (chalcopyrite), Cu.sub.5 FeS.sub.4 (bornite) and Cu.sub.2 S (chalcocite) (hereinafter referred to as "sulphide ores"), as opposed to copper in oxide form (hereinafter referred to as "oxide ores").
www.freepatentsonline.com /5316567.html   (7297 words)

 Copper extraction - Wikipedia, the free encyclopedia
Copper orebodies are formed when hydrothermal solutions bring copper dissolved from deep underground to cool near surface environments where the copper and associated metals precipitate as minerals in veins and disseminations within the rock.
Copper concentrate may be treated by either hydrometallurgical methods or sintered before pyrometallurgical methods are used to produce copper metal.
In the roaster, the copper concentrate is partially oxidised to produce calcine and sulfur dioxide gas.
en.wikipedia.org /wiki/Copper_extraction   (1668 words)

 Section 6
Copper is found in the earth’s crust and the oceans although the amount in the latter is thought to be negligible, amounting to no more than about 8 months mine production at present day rates.
Modern methods of extraction allow economic leaching and electrowinning of copper from low grade ores and extraction techniques are continuously being refined and developed to achieve the most efficient removal of copper from a wide variety of ores from sources around the globe.
The copper loaded solvent is then stripped of its copper by contacting with a strong sulphuric acid, producing a concentrated copper sulphate solution which is used as an electrolyte for electrowinning by the deposition of metallic copper on copper cathodes.
cda.org.uk /Megab2/general/pub121/section6.htm   (1344 words)

 Copper Chemistry
Solvent Extraction- the process by which copper ions are leached or otherwise extracted from the raw ore using chemical agents.
Copper ions are transferred from the leaching solution to the organic extractant upon mixing of the two reagents.
The copper ions that were present in the organic extractant thus dissolve in the electrolyte solution to give a copper containing "rich electrolyte." Here again there is a phase separation.
wwwchem.uwimona.edu.jm:1104 /courses/copper.html   (2541 words)

Furthermore, copper and many of its compounds show catalytic activity [e.g., copper(II) oxide is used as a catalyst in the manufacture of methanol, and several copper-containing enzymes are involved in photosynthesis and in respiration].
When this solution is electrolyzed, the cathodic reaction always results in copper being deposited, but the anodic reaction is dependent on the conductor acting as the anode: aqueous copper(II) ions are formed using a copper anode (Cell 1), whereas oxygen gas is evolved using either a platinum or carbon-graphite anode (Cell 2).
Copper is used extensively in water piping, alloys, electroplating, and in electrical wiring.
www.wissensdrang.com /auf1cu1.htm   (595 words)

 Copper Mine
The relative value of copper and byproducts vs. material[1], energy[2], and environmental [3] costs is a difficult issue to address within the time constraints of a 3 or 4 week module.
Copper ore characteristics: predominant mineral forms (oxidic vs. sulfidic), their relative value (quality) and geological location (depth and associated minerals), the relative solubility (magnitude of Ksp) and acid-base characteristics of these minerals.
378 in Extractive Metallurgy of Copper (Biswas and Davenport).
mc2.cchem.berkeley.edu /modules/copper   (3619 words)

 Extraction and Manufacture of Copper   (Site not responding. Last check: 2007-11-01)
Copper is mined by either underground or open pit mining.
The extraction of copper for sulphide ores is different to the removal of it from its oxidised ores.
Sulphide ores are crushed allowing the copper mineral particles to be released from the rock and then concentrated by froth flotation which is a method of separating ores from the unwanted gangue.
www.chem.shef.ac.uk /chm131-1999/cha99lcb/extraction.html   (267 words)

 GCSE notes on Extracting Metals at Doc Brown's Chemistry Clinic. advantages and disadvantages environmental impact of ...
The mass of copper dissolving at the anode exactly equals the mass of copper deposited on the cathode.
Copper sulphide ores can be rapidly roasted in heated air enriched with oxygen to form impure copper and this extraction process is called 'flash smelting'.
The Extraction of Chromium and Titanium by Displacement
www.wpbschoolhouse.btinternet.co.uk /page04/Mextract.htm   (3004 words)

Copper metal is extracted from molten matte through bessemerization.
Blocks of blister copper are used as anodes and thin sheets of pure copper act as cathodes.
During electrolysis, pure copper is deposited on the cathode plates and impurities which are soluble and fall to the bottom of the cell as anode mud or sludge.
www.citycollegiate.com /dblock4.htm   (393 words)

 Metal Stocks and Sustainability -- R.B. Gordon et al / PNAS v.103, n.5, 31jan2006
We choose copper for this purpose because it is geochemically scarce (1), because its use has been studied extensively by many workers, and because the pictures it presents are representative of such metal-related resource issues as the potential for recovery from landfills and the coupling between economic growth and in-creased demand.
The copper stock providing services in the U.S. throughout the 20th century is computed from the difference of the flow of copper into use and out of use as determined by product lifetimes and recycling rates defined elsewhere (9, 10).
Copper stock in use in domestic equipment reached a plateau by 1975; its subsequent small decline may reflect increased efficiency in metal use.
www.mindfully.org /Sustainability/2006/Metal-Stocks-Gordon31jan06.htm   (5936 words)

 Mining Technology - Rio Tinto Copper Mine - Palabora - South Africa
The copper orebody is hosted in a carbonatite pipe within which grades are typically concentric with the highest values (1.0% copper) at the core.
Although the tonnage produced was lower than that in 2003, reflecting continuing problems with fragmentation in the block cave and secondary breaking systems, the higher ore grade meant that the contained copper content was somewhat higher.
Copper smelting to produce anodes for subsequent refining to high-purity copper metal.
www.mining-technology.com /projects/palabora/index.html   (994 words)

 27943. Copper extraction from copper sulfate [Iran]
When I immerse a piece of zinc in copper sulfate solution copper should deposit but actually it is not copper powder, it's copper oxide; so please help me to prevent oxidizing the copper.
I am looking if there is some factor which causes the oxidation of copper through the reaction for example the oxygen or some other factor which I don't know.
I don't agree that it's copper oxide because that contradicts experience and because copper oxide is not an ion that you can immersion plate with.
www.finishing.com /279/43.shtml   (287 words)

This experiment involves the extraction of copper from an aqueous copper sulfate solution using a solution of LIX (a copper complexing agent) in kerosine.
The purpose of this experiment is to investigate the effect of major process variables on a process in which copper is extracted from a weakly acidic aqueous solution into a solution of LIX in kerosine.
If, in addition, the reaction between LIX and copper proceeds to completion, then the behavior would be as follows: When LIX is fed in excess, all copper is extracted from the water phase.
www.columbia.edu /itc/seas/E3810-lab/ext.html   (1001 words)

 Copper In-Situ Leach Project - SX/EW Plant - Arizona   (Site not responding. Last check: 2007-11-01)
KDE was the prime contractor for the engineering, procurement and construction management for a copper solvent extraction and electrowinning facility designed to process solutions from an in-situ leaching well field located near Casa Grande, Arizona.
The design criteria for this project required that the plant be designed to accommodate flows from the design of 50 gallons per minute to less than 20 percent of the design flow.
In addition, the copper tenor of the solution was expected to vary from the design of 2 grams per liter copper to in excess of 10 grams per liter copper.
www.kdengco.com /files/cu_in-situ.html   (280 words)

On industrial scale copper is extracted from its sulphide ore known as copper pyrite (CuFeS
Matte is converted into copper in a special furnace which is known as "Bessemer converter".
Copper obtained by this process is called blister copper.
www.citycollegiate.com /IX_copper.htm   (165 words)

 Oxygen Pyrometallurgy at Copper Cliff
This was demonstrated in Copper Cliff smelter full-scale tests on one of the seven 9.1 m X 33.5 m nickel reverberatory furnaces.
The additional useful reaction heat was employed to melt large quantities of scrap and concentrates (e.g., the 73% copper filter cake produced by the matte flotation copper-nickel separation plant).
In 1971, two 50 tonne TBRCs were commissioned at Copper Cliff (Figure 3) as the first stage in the transformation of complex metal sulfide intermediates to 99.98% pure nickel by the Inco Pressure Carbonyl Process.
www.tms.org /pubs/journals/JOM/9601/Queneau-9601.html   (6130 words)

 Copper Extraction
As with most copper ores, the malachite does not contain pure copper (native copper), and will contain other minerals besides the malachite.
Malachite, one of several minerals mined to obtain copper, is mined primarily in Arizona, the leading copper-producing state.
The copper ions will be reduced, forming copper metal, and the aluminum ions will go into the solution in their place.
www.darylscience.com /Demos/CopperOre.html   (722 words)

 The requirements for information extraction from text are getting increasingly sophisticated and challenging as we ...
The requirements for information extraction from text are getting increasingly sophisticated and challenging as we consider newer domains for using automatically extracted information
The focus of this workshop is on the extraction and synthesis  of events from raw information in text or other modalities.
We are particularly interested in position, vision, or research papers, and system demonstrations outlining or addressing challenges in the extraction of event oriented information.
www.ics.uci.edu /~ashish/ee.htm   (463 words)

 Copper Solvent Extraction/Electrowinning Facility - Myanmar (Burma)
It was turned over to the operator on 24 July 1995, commissioned and has produced 99.999 percent copper cathodes continuously since the start-up.
In addition to the process facility, a 50,000 ton copper heap leach pad, PLS ponds, intermediate PLS ponds, raffinate ponds and emergency storage ponds were also designed and constructed.
KDE subcontracted these services to Golder Associates who was responsible for the geotechnical aspects of the pad and pond design as well as supervision of the construction and installation of the HDPE lining systems.
www.kdengco.com /files/cu_solvent.html   (228 words)

 Harrison Western   (Site not responding. Last check: 2007-11-01)
Concentration of the copper is accomplished by the extraction of the purified water stream.
Most copper electro winning plants operate a bleed of electrolyte to control the concentration of ions such as iron, manganese, chloride or nitrate.
Applications have been developed and installed in the copper industry where a concentrate has been produced at a tenor suitable for recovery of copper, while the permeate is substituted for process water reuse elsewhere in the plant.
www.harwest.com /page149.htm   (538 words)

 Mining Technology - Cognis Corporation - Solvent Extraction Reagents and Services
COGNIS, supplier of LIX®Reagents and inventor of copper solvent extraction (SX), has been the recognized market and technology leader for more than 45 years.
AuRIX®: Solid and liquid reagents for the extraction of Au and Ag from cyanide solutions.
This software allows Cognis engineers to analyze each and every solvent extraction circuit (PLS, pH, sulfate content, stripping conditions, staging requirements, etc.) and formulate the optimal blend of oximes and modifiers.
www.mining-technology.com /contractors/chemicals/cognis/index.html   (723 words)

 Copper | Mining | Wastes | US EPA
It briefly characterizes the geology of copper ores and the economics of the industry.
The document describes copper ore extraction and beneficiation operations with specific reference to the waste and materials associated with these operations and the potential environmental effects that may result from lead-zinc mining.
It includes EPA site visit summaries and concludes with a description of current regulatory programs that apply to the copper mining industry as implemented by EPA, the Federal land management agencies, and the State of Arizona.
www.epa.gov /epaoswer/other/mining/techdocs/copper.htm   (210 words)

Exploration 3B: How is Copper Extracted from Oxidic Ores?
Exploration 4A: How is Aqueous Copper Separated From the Other Metals in Solution?
Appendix F: Solvent Extraction: A Viable Method for Selectively Extracting Metals from Solutions
chemistry.beloit.edu /CopperMine/index.html   (245 words)

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