A widely used method for exploiting secondary sulphide copper deposits involve leaching the ore in heaps or dumps. In both instances, ore piles are irrigated …Web
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In Chile, to obtain copper from leaching solutions, electrowinning (EW) was used (which is still in use today), as opposed to precipitation through the use of scraping iron [30]. A challenge faced by hydrometallurgical activity in Chile is the closure of its plants (heap leaching), such as the case of El Salvador (Codelco), announced in 2013.Web
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Existing research has demonstrated the feasibility of recovering target metals—i.e., copper, iron, manganese, cobalt, zinc, and others—through the application …Web
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In the present paper, the leaching of copper from printed circuit boards (PCBs) using sulfuric acid with Cu2+ and O2 is proposed. The effects of various process parameters such as agitation speed ...Web
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At a solid content of 10%, oxygen is essential for leaching; a copper extraction of 95.4% was achieved with oxygen injection, while only 33.4% copper extraction was obtained without introducing oxygen. ... Hydrometallurgy 2013, 140, 163–180. [Google Scholar] Beckstead, L.W.; Miller, J.D. Ammonia, oxidation leaching of chalcopyrite …Web
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PDF | On Aug 29, 2013, Ozge GOK and others published Leaching Kinetics Of Copper From Chalcopyrite Concentrate In Nitrous-Sulfuric Acid | Find, read and cite all the research you need on ResearchGateWeb
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A direct catalysed ferric leaching was performed, where the studied variable was the catalyst/bulk concentrate ratio. Conclusions. In order to recover copper and zinc, a leaching process consisting of a ferric leaching followed by a catalysed ferric leaching is proposed. High recoveries of both metals are not feasible in a single catalysed step.Web
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This article presents a copper leaching process from chalcopyrite concentrates using a low-pressure reactor. The experiments were carried out in a 30 L batch reactor at an oxygen pressure of 1 kg/cm2 and solid …Web
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The copper leaching increased from 27.6 to 63.2% within 120 min, when the concentration of NH 3-(NH 4) 2 SO 4 was increased from 0.05 to 0.4 mol/L. ... Watling H (2013) Chalcopyrite hydrometallurgy at atmospheric pressure: 1. Review of acid sulfate, sulfate-chloride and sulfate-nitrate process options. Hydrometallurgy 140:163–180Web
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: : Process for copper and/or precious metal recovery NZ717607A NZ717607A (en) : : A process for copper and/or precious metal recovery ... Method for leaching copper in waste printed circuit board by using glycine solution EP4100554A1 (en) * : : University Of Kentucky Research ...Web
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This paper provides an introduction to the theoretical background regarding the mathematical modelling of the leaching process of copper minerals, establishing an …Web
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In this paper, the effect of the cupric and chloride ions concentrations on copper dissolution from chalcopyrite concentrate was studied in acidified media. Variables included three different …Web
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The main objective of the present work is to study the use of two carbon-based materials in the leaching of zinc and copper from low-grade tailing waste. Furthermore, the effect of different H 2 SO 4 concentrations was studied in order to optimize the leaching conditions. Zinc and copper extracted from mine tailings was determined at 2, 4, and 6 h.Web
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Chalcopyrite (CuFeS2) is commonly used ore in production of copper, but leaching of this ore is very slow and inefficient due to "passivation" during leaching at atmospheric conditions. In this study, in order to overcome drawbacks of the passivation layers, the concentrate supplied from Eti Bakır A.Ş. Küre Plant in Turkey was roasted at …Web
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The contribution to hydrometallurgical copper production by heap leaching is expected to continue, because this technology is relatively simple, robust, flexible, and low cost. ... 2016, 2017; Watling, 2013). Heap leaching of primary sulfides is becoming a reality. El Abra (Chile) has implemented the Sulfolix process to treat high-bornite ...Web
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Nitric acid leaching followed by solvent extraction has been reported to selectively recover copper, gold and nickel (Rao et al., 2021). The Cu-rich leach liquor of WPCB obtained after ...Web
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A copper extraction of 91.5% was achieved after 72 h of leaching by using 0.71 M ammonia, at a Gly:Cu molar ratio of 4:1, by using a solid content of 1%, with a ceramic media: solid ratio of 3:5 ...Web
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Problems with copper heap leaching may arise from the ore mineralogy, more specifically, the presence of reagent consuming gangues and clays minerals. ... A.N.; Franzidis, J.-P. Investigation of the Effect of mineralogy as rate-limiting factors in large particle leaching. Miner. Eng. 2013, 52, 38–51. Bouffard, S.C. Review of Agglomeration ...Web
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Reactor and column leaching studies for extraction of copper from two low grade resources: A comparative study Sandeep Panda a, Geetanjali Mishra a, …Web
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In the present study, chalcopyrite concentrate was leached using different chloride and cupric concentrations, and two solution pH setpoints, in order to study a process for leaching copper concentrate in …Web
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Watling, 2013 [10] 3.5. Electrochemical study on chalcocite oxidation ... relevant researchers first determined the correlation between the factors affecting copper leaching efficiency and ore types (Table 7). In brief, low pyrite content and poor permeability are characteristics of copper ores with a high proportion of clay (high-clay) and ...Web
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Sokić et al. reported that the kinetic data for the copper leaching process show a good fit for the model controlled by diffusion, and the calculated activation energy value was 80 kJ/mol. Hu et al. examined the kinetics of the copper extraction process in an [HMIm]HSO4 ... Hydrometallurgy 2013, 131–132, 120–126. [Google Scholar]Web
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Leaching behavior of copper from reduction roasting pyrite cinder was investigated. • The copper leaching mechanism were analyzed by chemical phase …Web
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When the amount of the PCBs was increased, more ferric ions were required to be produced by bacteria to leaching copper from PCBs. Therefore, more acid was consumed. ... (2013) Bioleaching of copper from low grade scrap TV circuit boards using mesophilic bacteria. Hydrometallurgy 138:65–70. Article CAS Google Scholar Bryan CG, …Web
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In its studies on pressure leaching of copper concentrates, Sherritt has shown that arsenical feed materials can be converted into environmentally stable residues, with excellent copper extractions. ... Yan L (2013) Pilot plant pressure oxidation of a refractory gold-silver concentrate. CIM J 4(3):160–166. CAS Google ScholarWeb
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The authors found that a H 2 SO 4 concentration of 0.5 M, a pressure of 2 MPa, a temperature of 180 °C, a leaching time of 60 min, and a solid phase content of …Web
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The copper heap leaching, solvent extraction, and electrowinning process has revolutionized the copper industry and significantly reduced the capital and operating costs for the production of copper from low-grade ores.A schematic of a typical heap leach/SX/EW operation is shown in Fig. 4.29.The SX part of the flowsheet recovers …Web
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In a recent study by Osorio et al. (2013); gene transcription (microarrays) and protein level ... Copper leaching operations (involving both chemical and biological operations) from 1900s till the 21st century has contributed to the total copper production by 10–20%. Copper production in 1981 was 0.6 million tons (MT) which has risen to 3.3MT ...Web
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In-place leaching of rubblized and terraced walls of the Oxide pit at the Silver Bell mine, Pima County, Arizona (Satellite Photo from Google Earth - 12/20/2014) ... Information Agency, 2013). How Solution Mining of Copper Works Solution mining of copper replicates a natural processWeb
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Leaching of chalcopyrite Leaching of copper from chalcopyrite was first studied with different solvents and oxidizing agents at 60 °C. The following organic solvents were used for chalcopyrite leaching: ethanol (EtOH), propylene glycol (PG) and ethylene glycol (EG) ().The solvent has a significant effect on the leaching efficiency of iron and copper, …Web
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This study presents the novel idea of a cyanide-free leaching method, i.e., glycine-ammonia leaching in the presence of permanganate, to treat a low-grade and copper-bearing gold tailing. Ammonia played a key role as a pH modifier, lixiviant and potential catalyst (as cupric ammine) in this study. Replacing ammonia with other pH …Web
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In this study, a hydrometallurgical method for the recovery of copper, cobalt, and zinc from copper slag flotation tailings (SFT) was investigated. SFT contains large amounts of valuable metallic compounds, such as copper, cobalt, and zinc. A representative SFT sample containing 0.50% Cu, 0.148% Co, 3.93% Zn, and 39.50% Fe …Web
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An option to improve the leaching efficiency of chalcopyrite is pretreatment prior to leaching. Pretreatment variables, such as the curing time and the addition of chloride, can increase the kinetics of copper …Web
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The study by Hedjazi and Monhemius indicated that the addition of ammonia during cyanide leaching of gold-copper ore at Gedabek mine in Azerbaijan helped to reduce copper dissolution by half (i.e., from 41.9 to 21.1% Cu) and ultimately reduced cyanide consumption when the copper ore mineralogy was changed from low to high …Web
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