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The effect of ammonium salts on copper recovery from an industrially provided ICT waste was investigated by using an ammonia-based leaching solution. The solutions were further treated to electrodeposit copper. With a systematic understanding of the copper leaching and electrochemical behaviour of different leached solutions, the …
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This paper outlines the successful piloting of solvent extraction process for copper recovery from ammonia leach solutions, while providing main operating parameters and resulting plant performance. 1 INTRODUCTION Every day huge amounts of waste is produced all over the world. There are three different ways to take care of the waste; …
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Ammonium is typically removed from wastewater by converting it to nitrogen gas using microorganisms, precluding its recovery. Copper hexacyanoferrate (CuHCF) is known to reversibly intercalate alkali cations in aqueous electrolytes due to the Prussian Blue crystal structure.
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Copper Recovery from Printed Circuit Boards Using Ammonia–Ammonium Sulphate System: A Sustainable Approach . × ... In this work, leaching of copper industrial waste (CIW) using a HCl solution with Fe3+ as oxidant has been carried out. Copper recovery from the leaching solution has been evaluated in batches at room temperature, using ...
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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 Recovery From Ammonia Solutions Through Electro-Electrodialysis (EED) ... This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with ...
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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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Initially, the distribution of NH 3 /NH 4 + were constructed at different concentration of NH 3 and NH 4 + and varying ammonia salts– (NH 4) 2 SO 4, NH 4 Cl, …
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Thiosulfate leaching-resin adsorption recovery, an environmentally friendly process, has been developed to efficiently extract gold from an oxide gold concentrate. 80.5% of gold extraction could be achieved by thiosulfate leaching under the conditions of (NH 4) 2 S 2 O 3 0.2 mol/L, CuSO 4 0.025 mol/L, NH 3 1.5 mol/L and leaching time 8 h, …
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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. …
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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 …
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Membrane hybrid systems are promising for ammonia recovery, nutrient concentration, and wastewater treatment, with applications in fertilizer production and water purification. Overall, nitrogen removal ranges from 28 to , and nitrogen recovery ranges from 9 to . ... also determined that when using copper oxide and zinc …
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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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This study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. …
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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 …
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Keywords: leaching, extraction, ammonia, copper . INTRODUCTION . Although the use of sulfuric acid in acid leaching process is a conventional method for recovery of copper, in some cases it is ...
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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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A comparison between using ammonia and sodium hydroxide as pH modifiers was conducted and the leaching performance of glycine-ammonia has been found to be superior based on both metal extractions and leaching kinetics. The use of resin-in-leach (RIL) to recover Ni and Co from glycine-ammonia leaching solution …
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4) being the most stable. In order to suppress the unit operation. of solvent extraction (SX) and move directly to the electrochemical process, an electro-. electrodialysis (EED) process …
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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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Studies about direct electrochemical recovery of copper from ammonia solutions have been carried out with promising results (Majima, 1993; Bingöl et al., 2005; Guo and Searson, 2010; Ordoñez and Alfaro, 2011; González Mercado et al., 2015). However, there are no studies focused on toxicity and/or corrosivity issues due to the …
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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 and at ambient temperature. ... Oraby, E.; Eksteen, J. Recovery of copper and the deportment of other base metals from alkaline glycine …
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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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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 ...
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Ammonia is commonly used to extract copper, zinc, and cobalt because of the excellent stability of metal ammine complexes and the high solubility of ammonia. ... The copper recovery ratio was 98.51% when the ECS purification reaction was performed at 70 °C for 4 h at a cell voltage of 0.5 V and a current density of 75 A/m 2. The ECS …
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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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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 …
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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 electrodeposition process has been proven feasible with 90% current efficiency during copper recovery, and the copper purity can reach 99.8 wt %. The residue from the first …
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Regulate the sequential crystallization of Cu 2 Cl(OH) 3, Cu(OH) 2, and CuSO 4 ·5H 2 O from acidic copper etching solution from ammonia.. Ammonia can act as OH − and Cu 2+ storage bank and slows down the crystallization kinetics.. Spherical Cu 2 Cl(OH) 3 particles with compact surface, good fluidity, and low moisture-absorption-ability can …
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