In this research work, the leaching behavior of a copper oxide ore sample prepared from the Qaleh-Zari copper mine with a very high grade of 5.4% Cu (malachite and azurite) was investigated to ...Web
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Therefore, a pre-treatment of leaching manganese to destroy the crystal lattices of the manganese oxide ore and liberate this portion of silver prior to cyanidation is necessary. The results of this pre-treatment reveal a positive relationship between the leaching percentages of silver and manganese.Web
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PDF | Leaching of copper from a Jordanian copper ore has been studied using a stirred batch reactor with hydrochloric acid as the main lixiviant, under... | Find, read and cite all the research ...Web
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Pretreatment of Copper Sulphide Ores Prior to Heap The process of heap leaching was used on a large scale in Chile, where copper oxide ores were treated with sulphuric acid, and copper sulphides were solubilized with the help of ferric ions, which acted as an oxidizing agent Diana Pizarro, Víctor Quezada, and Lilian VelásquezYévenes 2021 …Web
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Agitation leaching is a promising technology in hydrometallurgy for treating copper–cobalt oxide ores. In this work, the behavior of oxide ores containing around 2.3% Cu and 0.3% Co received from Congo was investigated for varying particle size, acidity, pulp density, temperature, leaching time, and reduction potential. XRD, optical microscopy …Web
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The oxide copper minerals have thick hydration film surfaces, which are hard to contact with air bubbles, implying that the flotation response of oxide is inferior to sulphide copper ores, …Web
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is a necessary step to improve the leaching of copper oxide and secondary sulfide ores. Acid pre-treatment of ores using H 2SO 4 produces dehydration a nd inhibits gangue dissolution, making an increase of the copper leaching rate by the formation of soluble sulfur-copper complexes. Also, it passivates the well-known acid-consuming gangue [22].Web
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Modified thionocarbamates are used in copper-gold ores, which allow some selectively against iron sulfides even at a pH value less than 10. Many gold plants use a blended collector or separate collectors as needed based on mineralogy and ore chemistry. Copper sulfate is commonly used as an activator of gold-bearing iron sulfides in flotation ...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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So far, sulphidizing flotation has become the most widely-used industrial approach for the utilization of copper oxide ores. If xanthate collector is used solely in complex copper oxide ores, its collection capability is limited. However, excessive amount of sulfurizing agents have great adverse effects on the flotation of copper oxide [3].Web
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Solvent Extraction and Electrowinning (SX-EW) production, virtually non-existent before the 1960s, reached nearly 3.8 million tonnes of copper in 2013. (Courtesy of ICSG.) One of the biggest advantages of using leaching is that low grade ores that would be uneconomic to smelt become economic to leach.Web
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ores via leaching tests in shaking flasks, to later carry out a conventional leaching process, obtaining a copper extraction of 6.05% for sulphide copper ores without pretreatment and 8.17% with pretreatment, while for copper oxide minerals, a copper extraction of 84.81% was obtained without pretreatment, and 93.74% with pretreatment, …Web
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The best copper extraction of 80.2% was found considering a pretreatment of 30 days, 25 kg/t of H 2 SO 4, 50 kg/t of NaCl, and a leaching solution concentration described previously with 2 g/L of Fe +2. The results showed the leaching of all copper oxide species and 20% of the copper sulfide species.Web
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Heap leaching is a well-established extractive metallurgical technology enabling the economical processing of various kinds of low-grade ores, which could not otherwise be exploited. However ...Web
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In this investigation, a laboratory-scale study to extract copper (Cu) from its oxide ore (0.425–11.2 mm particle size) was conducted using varied sulfuric acid (H2SO4) concentrations (0.05–0.5 M) as a lixiviant. Through a physicochemical and mineralogical analysis of real field ore samples from the Almalyk mine heap site (Tashkent, …Web
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The dissolution of carbonate gangue minerals, which are often ubiquitous in copper deposits, leads to the consumption of large amounts of acid during the leaching …Web
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Effect of nitric acid pre-treatment on the extraction of silver from the ground ore (d 80 : 50 µm) in cyanide leaching (Cyanidation conditions: 1.5 g/L NaCN, pH 10.5, 25 3 C, flow rate of air: 1. ...Web
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The experiments showed that the untreated raw oxidized copper ore show significant leaching which is 9.5% for saline and 35.5% for fertile soils respectively. This is an important finding which showed that oxidized …Web
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The global market has announced copper as a modern energy metal and finds its extensive utilization in the construction industry, electrical wiring, power transmission lines, alloying, anticorrosive coating, heat exchangers, refrigeration tubing, etc. Copper ore is primarily beneficiated from sulphide mineral deposits. Due to high-grade …Web
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the economics of beneficiating copper oxide ores prior to leaching other title rentabilite de l'enrichissement des minerais oxydes de cuivre avant lixiviation (fr) author meech ja; paterson jg queen's univ., dep. mining eng./kingston on/can sourceWeb
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Results of dissolution studies showed that the copper oxide ore leaching in H 2 SO 4 solution increase with increasing time, pH, stirring speed and temperature at fixed H 2 SO 4 concentration of 0 ...Web
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Even though the dosage of H 2 SO 4 is frequently the key economic component in the process of leaching copper in its oxide form from this ore, copper oxide ore dissolves in H 2 SO 4 solution at room temperature. ... Before the feed hopper is empty, the turntable speed was adjusted so that each sample collector would pass several times …Web
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The effect of stirring speed on the leaching of copper, cobalt and iron from the copper oxide ore (0.77 M H 2 SO 4, 5 g of ore, particle size: 80%À62.23 mm, S/L: 13%, 60 min, pH: 1.0, ambient ...Web
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The most successful copper heap leaching operations have been those processing copper oxides and secondary copper sulphides (Table 1).Chalcocite (Cu 2 S) is the main copper sulphide mineral mined at bioleaching operations. Some of the chalcocite heap operations began as oxide (chemical) leach operations and were converted to …Web
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the part of cooper oxide either by leaching of grinded ore prior the flotation or by leaching the flotation tailing coming out from the concentrator. Direct leaching process of copper oxides or complex ores attracts considerable scientific and engineering attention, which plays an important role in the sus-tainable development of copper industry.Web
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Jun Wang, Biwen Yang, Guanzhou Qiu, Senlin Cui & Hao Ma JOM 75, 5785–5795 ( 2023) Cite this article 45 Accesses Metrics Abstract The copper-cobalt ore …Web
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Reduction of "oxide copper", by acid leaching prior the flotation concentration, can increase the overall copper efficiency up to more than 70% in the single-stage leaching, achieving...Web
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The reductive leaching of nickel laterite has attracted the interest of many researchers due to the enhanced kinetics of nickel and cobalt dissolution in the presence of acids and reducing agents during atmospheric, pressure, heap or bio leaching processes. Systematic studies on synthetic oxides and natural ores can shed light on the reaction …Web
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The best result was 65% of water replacement, with 62% of copper dissolution. The leaching test showed a positive effect of weak acid on water replacement. The result was slight in terms of copper recovery, …Web
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The copper-cobalt ore received from Congo contains around 2.0% copper and 0.356% cobalt, with oxidation rates of 92.09% and 88.57% for Cu and Co, respectively. Malachite and cornetite are the main copper minerals, while heterogenite and carrollite are the main Co-bearing minerals. To optimize the leaching efficiency of Cu and Co for this …Web
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The proportion of bioleached copper in the total production of leached copper in Peru to date is about one third. It can be expected that the share of leached copper will further rise in Peru because of the reinforced leaching of oxide copper ores, as well as the bioleaching of sulfide ores. 2.1.2 New DevelopmentsWeb
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The composition of copper ore samples was analyzed with the use of fluorescence and chemical methods. Table 1 shows the content of the main valuable component—copper—as well as metals with the highest content that affect the leaching process. Table 1. Amount of copper and other metals in copper ore samples (%).Web
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Although the main cause of hydrometallurgical plant closures is the depletion of oxidized copper minerals reserves, the lack of new hydrometallurgy projects also …Web
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The economic assessment of this approach suggests that it can be implemented with positive net present values to copper oxide ores located at depths in the 100–300 m range, with copper grades ...Web
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1. Introduction. Heap leaching forms part of the group of technologies known as percolation leaching, which includes in situ leaching, dump leaching, heap leaching and vat leaching (Bartlett, 1998, John, 2011)mon to all these technologies is migration of leach solution through a fixed bed of ore particles, on its path interacting with the …Web
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The acid flow rate was constant during leaching tests. In the following column leaching tests, two types of particles were used, namely, the crushed copper oxide ore particles and the drainage gravel. The crushed copper ore samples were extracted from Meydouk copper ores (0.39% oxide copper).Web
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