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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. …
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 ...
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 …
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 …
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 …
The use of sulfuric acid in an acid leaching process is a conventional method for recovery of copper, but in some cases it is necessary to use other reactants such as ammonia. Ammonia has been known as an effective leaching agent in hydrometallurgical procedures, although it has been less studied than the chemical …
This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with cupric tetramine ( Cu(NH3)2+ 4 Cu (NH 3) …
The recycling of Cu from WPCBs has attracted increasing attention during the last two decades [5,6]. As a more sustainable process, ammonium salts ((NH 3 ) 2 SO 4, (NH 3 ) 2 CO 3 and NH 4 Cl) and ...
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 …
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 …
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 …
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 …
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 …
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].
Specifically, copper in the ICT waste could be selectively extracted by using an ammonia-ammonium carbonate solution. In the downstream to recover copper from …
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 …
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 …
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 ...
Alkaline leaching with highly selective ammoniacal complexing agents is an interesting alternative for the treatment of copper concentrates. This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with cupric tetramine ( Cu (NH 3) 4 2 +) being the most stable.In order to suppress the unit …
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 …
Previous work on the use of ammonia in copper-gold cyanide leach systems is reviewed. ... Separation and recovery of copper from synthetic ammoniacal chloride …
extraction of copper from aqueous solutions, there is limited data on PLS obtained from leaching with ammonia solution. Hence, in this investigation, the separation and recovery of Cu (II) from ammonia PLS using Cyanex®272 in kerosene diluent were performed. 2 Experimental 2.1 Materials Distilled water was employed for the preparation of all
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 …
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; …
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 ...
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 ...
output raffinate and the pulp was distilled to recover ammonia and precipitate gypsum for use. Flow sheet of Arbiter process is shown in Fig. 3.This process was not welcomed by the industry due to technical and economic problems in the final stage, the recovery of ammonia and due to weak elimination of sulfate ions from
to recover copper due to high solubility in ammonia, later on ammonia leaching of sulfide ores was also considered. The common method was the use of oxide roasting at high
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 …
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. …
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 ...
improved by using ammonia-based leaching process, specifically for electronic waste enriched with copper. Thisresearch proposes electrodepositionasthe subsequent approach to effectively recover copper from the solutions after selective leaching of the electronic waste and focuses on recognising the electrochemical features of copper recovery.
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 …
