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Later, Stanković introduced a copper extraction process involving two metallurgical stages: an initial acidic agitated leaching followed by flotation of the insoluble solids from the leaching step. In the first phase, he applied parameters of 0.2 M H 2 SO 4, an S:L ratio of 1:2, agitation at 300 RPM, a temperature of 20 °C, and a 1-h ...
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The study of copper (Cu) recovery is crucial for the entire recovery process of waste printed circuit boards (WPCBs), and Cu can be leached efficiently via a sulfuric …
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The influence of glycine which is the main leaching agent for this system was investigated by varying the Gly:Cu ratio in the aqueous phase from 2:1 to 16:1 while the aqueous copper content was kept at 2 g/L and pH 11.The organic phases from either extractant (10%v/v extractant) were then contacted with the aqueous phases at an A:O …
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Recent focus on hydrometallurgical methods for non-sulfide copper ores prompted a study on leaching a copper oxide ore containing 2.22% Cu, 44.9% SiO2, 6.94% Al, 6.61% Fe, 6.25% Mg, 3.67% Ca, and 1.7% Na with H2SO4 for gaining insight …
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The copper leaching reaction occurs on the interface of two phases (solid-liquid) and it is a heterogeneous process. Normally, the solid liquid system of the hydrometallurgy process could be demonstrated by an unreacted shrinking core model (Gui et al., 2020). Therefore, the unreacted shrinking model was used in this paper.
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The study of copper (Cu) recovery is crucial for the entire recovery process of waste printed circuit boards (WPCBs), and Cu can be leached efficiently via a sulfuric acid–hydrogen peroxide (H2SO4–H2O2) system. To achieve high Cu recovery, it is important to evaluate the parameters of the leaching process and understand the Cu …
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D'Andrea D, Chamberlain PG, Fletcher LR, Ground characterization for in situ copper leaching. Proceedings of the Las Vegas Symposium on Leaching and Recovering Copper from As-Mined Materials, February 1980. Google Scholar Farias L et al. Acid leaching of copper ores. Copper '85, Copper Hydrometallurgy Short Course. Santiago, November …
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The leaching experiments were optimized by BBD using the RSM to leach malachite at 2.6130 M H 2 SO 4, 133.919 m particle size, 60 ⁰ C, and 600 rpm agitation speed, and scored 98.159%.
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Leaching is strongly influenced by temperature. A slower increase in the leaching degree is noticeable after 120 min. This is probably due to the surface of Cu(I) sulphide particles being blocked by the reaction's solid products (calcium sulphate and elementary sulphur), and that, therefore, resulted in more difficult penetration of the …
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1. Introduction. Mining engineering is an essential cornerstone and an impetus to promote progress and development of human beings (Brierley and Brierley, 1999).However, owing to the migration of heavy metals, such as lead, gold and copper, and landslide hazards, potential environmental pollution of the surrounding soil and …
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This study suggests that ferrous containing lixiviants can effectively promote the manganese and cobalt dissolution but are not efficient for extracting copper. …
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In copper dump leaching, run-of-mine ore is irrigated with acidic leaching solution to generate aqueous cupric ions for further processing. The very large size of …
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The pressure leaching of copper concentrates continues to be attractive for rapid, complete oxidation of sulfide minerals with high copper extraction and arsenic stabilization of iron–arsenate minerals and precipitates. In many cases, the excess sulfuric acid from the autoclaving process can be used to make up the acid demand for …
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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 of such ores, which can make the process uneconomical (Habashi, 1970, Habashi, 1980, You-Cai et al., 2013).Table 1 shows the acid consumption and estimated time to complete …
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Most companies currently engaged in copper leaching are researching or are planning to research the following: (1) The solvent extraction of copper from leach liquors; (2) the use of other precipitants …
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The test samples contained between 0.33% and 0.35% soluble Cu, and between 0.36% and 0.38% total Cu. Soluble Cu is defined as that portion of copper that is extractable by sequential digestion in acid and cyanide (Lizama, 2017), and is understood to represent copper present as chalcocite.The balance of the copper content, also termed …
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leaching of copper converter slag in the presence of oxalic acid and citric acid. It is stated that 99.1% Cu, 89.2% Ni, 94% Co, and 99.2% Fe were extracted under the optimum conditions (9 −10 h leaching time, 35 ℃ temperature, 15% pulp density and 2 N citric acid). Leaching of lead and copper by
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Figure 5 showed the influence of inoculation quantity on leaching copper, nickel, zinc and aluminum from metal concentrate of waste PCBs. Fig. 5. Effect of inoculum bacteria on copper, nickel, zinc and aluminum extraction (other conditions: 10% pulp density, 10 days leaching time, 1.8 initial pH, 30 ± 2 ℃, 125 µm and 180 rpm) ...
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of free NH 3 and, c oncomitantly, the diss olution of copper also increase. Excess Cu 2+ ... The concept of leaching copper–gold ores using leach solutions which contain Cu(CN)32− was ...
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2.2. Instruments and procedure Fig. 1 shows the set-up used to study the leaching process of copper tailings. The experiments were performed according to the following procedure. First, 200 mL of the leaching agent was prepared using H 2 SO 4 and deionized water, and poured into a three-necked round-bottom flask. The leaching agent was heated to the …
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Concept of in-situ leaching of copper from a spent heap. Leaching solution is introduced to a production zone by way of injection wells. The injected leach solutions form a plume wherein leaching occurs. Solution within the plume drains downwards and is collected by the spent heap's drainage system.
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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…
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In situ leaching offers a potentially attractive way to extract copper from the subsurface without costly fragmentation and processing. Applicability of in situ leaching …
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This paper deals with the investigation of column leaching of low-grade ores from the copper mine Cerovo, Serbia (the approximate Cu content in the ore ranges from 0.2 – 0.3 % with >10 % copper ...
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The copper and cobalt solubilization yields obtained were 89.93% and 95.72% at 32 g and 80 ° C. The results showed that solubilization of cobalt was not influenced by temperature. Discover the ...
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The kinetics of copper minerals leaching was recently published by several authors, for example Sokić at al. kinetics of copper leaching from chalcopyrite [7], Bingol and Canbazoglu kinetics of ...
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Catalysis of FeCI3 leaching by CuCI2 in solution, or by Ag2S or FeS2 in the solid CuFeS2, is explained by the electrochemical model. Ways of enhancing the rates of leaching are suggested. INTRODUCTION Iron(Ill) chloride, iron(Ill) sulfate and copper(ll) chloride dissolve chalcopyrite in several hydrometallurgical processes (refs. l,2).
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At the same time, the stirring speed exhibited nearly no effect on the leaching rate of copper, and the dissolution process was controlled by chemical reaction. 5-SSA is therefore a new attractive ...
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Leaching processes of metallic copper or ores containing copper in the divalent state have been the subject of many research works inrecentyears[9–13].However,nostudywasfoundconcerningthe
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Multiple purification of zinc sulfate solution is an important process for zinc hydrometallurgy, and large quantities of copper-cadmium residues are generated as byproducts in this process. Copper-cadmium residues contain a large number of valuable metals that must be recovered. A comprehensive extraction process has been proposed using sulfuric acid …
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