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Recovery of copper from ammoniacal/ammonium …

A new approach (circuit with internal ammonia recycling) for the treatment of copper/ammonia loaded organic solutions obtained in the solvent extraction operation of ammoniacal etchant solutions has been described [4] but it has not yet been experimentally tested using LIX 973N. Experiments are to be conducted in this laboratory to compare …

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Recovery of high purity copper cathode from printed circuit …

The behavior of impurity elements during a copper recovery process from waste printed circuit board (PCB) using ammonia–ammonium sulfate and chloride systems are examined and the performance of these two systems are compared. Leaching of PCB was carried out by solutions containing copper(II) ammine complexes as the …

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Clean recovery of copper from waste printed circuit boards using …

Ammonia could also be used to selectively leach copper by forming stable complexes in the presence of oxidants. 98 % Cu was leached at 8 % ammonia and 0.5 mol/L ammonium salt [16]. The above hydrometallurgical processes suffer from difficulties in agent recovery and high environmental costs [17].

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Separation and Recovery of Copper from Ammonia …

Therefore, by using Cyanex®272, it is feasible to achieve the separation and recovery of copper and other associated gangues from ammonia PLS at defined aqueous basicity [16, 17]. Although a lot of studies have been performed on the extraction of copper from aqueous solutions, there is limited data on PLS obtained from leaching …

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Electrochemistry during efficient copper recovery from …

Leaching selectivity during metal recovery from complex electronic waste using a hydrochemical process is always one of the generic issues. It was recently improved by using ammonia-based leaching process, specifically for electronic waste enriched with copper. This research proposes electrodeposition as the subsequent …

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Effective treatment for electronic waste

By using an ammonia-based electrolyte, it has been found that selective leaching is possible, especially for copper recovery (Sun et al., 2015b) and the principle is assumed to be applied in this electrolysis process. Because of the high potential of selective copper recovery, energy consumption becomes important to optimise the …

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A Cleaner Process for Selective Recovery of Valuable Metals …

It was found that the recovery efficiency and extraction selectivity of copper both reached more than 95% by using ammonia-based leaching solutions. A new …

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Extraction of Gold and Copper from Flotation Tailings Using …

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 …

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Copper recycle from sulfide tailings using combined leaching of ammonia

Thus, in this study, to recover valuable metals and reduce pollution, a cleaner metal extraction method from copper sulfide tailings using a combined leaching method employing ammonia solution and a novel strain of alkaline bacteria under alkaline condition was explored.

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Recovery of copper powder from copper concentrates and …

Copper concentrates can be sulfation roasted and leached with water to produce impure solutions of copper(II) sulfate. Copper sulfites are precipitated from aqueous copper(II) sulfate solutions with soluble salts of sulfurous acid like (NH 4) 2 SO 3 or Na 2 SO 3.The water insoluble copper sulfites dissolve in acetonitrile—water (AN/H 2 …

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An environmentally friendly process to selectively recover …

1. Introduction. Copper anode slime is the byproduct of electro-refining of copper, which often contains precious metals and is a valuable secondary resource for recovering valuable products, such as silver, from it (Ding et al., 2017, Wang et al., 2017, Yldrm et al., 2014).The predominant method for silver recovery from anode slime is …

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Selective copper recovery from complex mixtures of end-of …

The kinetics of copper recovery from the industrially provided ICT waste was investigated by using an ammonia-based leaching solution. With a systematic understanding of the apparent reaction kinetics, optimisation of the copper recovery process becomes easier. It can be found that this process can reach a high copper …

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Recovery of copper from ammonia–ammonium chloride leach liquor using

In this study, the recovery of copper from ammonia–ammonium chloride (NH3–NH4Cl) leach liquor using sterically hindered beta-diketone (β-diketones), a well-known extractant, was investigated. The experimental approach entails studying how various factors, including extraction time, concentration of the extractant, pH, phase …

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Recovery of copper from printed circuit board (PCB) acidic …

Industry acidic copper wastewater always contains impurities such as Fe 3+, and Al 3+. Unlike Cu 2+, they tend to precipitate as hydroxides rather than complexing with ammonia. As a result, use ammonia as the neutralizer can also help to exclude these impurities from the copper products.

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Recovery of copper from alkaline glycine leach solution using …

Extraction experiments were carried out using an aqueous solution containing 2 g/L Cu at Gly:Cu molar ratio of 3:1 and pH 11.The different phases were allowed to attain the set temperature (15–55 °C) and then contacted at an A:O 1:1 for 15 min at the set temperatures.Results in Table 2 show that within the studied temperature …

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Copper, zinc, and nickel recovery from printed circuit …

tion and communication technology (ICT) waste using the sulphuric acid and the ammonia–ammonium sulphate sys-tem with two oxidizing agents, respectively, air and hydro-gen peroxide. Copper recovery was about 90% and the con-clusion was that ammonia is more selective than sulphuric acid and that hydrogen peroxide is an …

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Sequential Separation of Cobalt, Copper, and Nickel from …

Deng Z, Oraby E, Li H, Eksteen J (2022) Extraction of copper from chalcopyrite using alkaline glycine-ammonia solutions. Minerals 12(12):1507. Article CAS Google Scholar Oraby EA, Eksteen JJ (2014) The selective leaching of copper from a gold–copper concentrate in glycine solutions. Hydrometallurgy 150:14–19

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Recovery of copper from ammonia–ammonium chloride leach liquor using

In this study, the recovery of copper from ammonia–ammonium chloride (NH 3 –NH 4 Cl) leach liquor using sterically hindered beta-diketone (β-diketones), a well-known extractant, was investigated. The experimental approach entails studying how various factors, including extraction time, concentration of the extractant, pH, phase …

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Ammoniacal leaching and recovery of copper from alloyed …

The paper concerns a hydrometallurgical method for selective recovery of copper from low-grade electric and electronic wastes. The following consecutive stages were proposed: smelting of the scraps to produce Cu–Zn–Ag alloy, leaching of the alloy in ammoniacal solution, and selective copper electrowinning. Cu–Zn–Ag alloy was a …

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Electrochemistry during efficient copper recovery from …

Leaching selectivity during metal recovery from complex electronic waste using a hydrochemical process is always one of the generic issues. It was recently improved by using ammonia-based leaching ...

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Use of Ammonia Salts in Selective Copper Extraction from Tailings

In this study, the use of different ammonia salts for copper extraction from tailing was investigated. Although there are some studies about using ammonia salts for hydrometallurgical research, it is observed that these salts are used in tailings from metals with limited use. ... In this context, the first experiment involved recovery of copper ...

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Copper Recovery From Ammonia Solutions Through Electro …

This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with cupric tetramine ( Cu(NH3)2+4) being the …

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Review of ammonia recovery and removal from wastewater using …

The earliest keywords appearance were "extraction" and "separation" from studies on metal (e.g., copper and silver) recovery from ammoniacal etching ... [32] evaluated the use of MC to recover ammonia as marketable fertilizer. As MD/MC were more widely used for ammonia removal, studies focused on "mass transfer" and ...

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Selective leaching of a copper ore by an electromembrane process using

Conventional leaching were performed first using ore samples mixed with appropriate solutions. Fig. 2 shows the optimum copper extraction yields obtained versus the leaching time after the optimisation of all others parameters i.e. ammonia concentration (1.2 N), liquid–solid ratio (5) and ore grain size (<200 μm).It is noticed that the copper …

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Recovery of ultrafine copper particles from metal components …

Results show that, from the ammonia–copper ligands solution, copper can be recovered using LIX 84, and the recovery was highly efficient at a pH of 10. Thereafter, the metal was stripped using 2 M H 2 SO 4 to produce rich aqueous phase containing 39.25 g/L copper ions and less than 0.05 g/L of other impurities. This pregnant solution …

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Bioelectrochemical recovery of ammonia–copper(II) …

Highlights The feasibility of complex copper recovery using a dual chamber MFC was confirmed. Up to 96.26% of complex copper(II) removal was achieved in MFC from ammonia solution within 12 h. By acidifying catholyte, the structure of complex-copper(II) compound can be destabilized, then facilitate copper reduction. The …

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Recovery of copper from simulated ammoniacal spent etchant using

Figure 1 shows the extraction rate of copper using the organic phase 40% of HR. The aqueous phase was simulated ammoniacal spent etchant containing 112.98 g/L Cu and 7 mol/L total ammonia ([NH 3 ] + [NH 4 + ]). Fig. 1 Effect of extraction time on copper recovery (Aqueous phase: 112.98 g/L Cu, 6 mol/L NH 3, 1 mol/L NH 4 + and …

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Ammonia Leaching: An Alternate Route for Copper Recovery

The use of ammonia as a leaching agent in the recovery of copper from ores and concentrates has a number of potential benefits. These include the ability to treat ores with an acid consuming gangue, non-corrosivity, the insolubility of iron in the solution and increased selectivity. This paper reviews the previous and current use of ammonia …