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 ...

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 ...

Processing copper – gold ores with ammonia or ammonia – cyanide solutions . in World Gold . 1991. [7] Sceresini, B. and P. Breuer, Gold-copper ores, in Gold Ore Processing . 2016, Elsevier. p ...

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 range, there is no …

This paper reported on the leaching behavior of printed circuit board (PCB) using a new leaching agent of ammonia-ammonium persulfate, to recover copper. Cu and Zn leaching were found to be fast and reached equilibrium in 6h whereas for Ni, prolonged leaching time was needed. The best leaching efficiency was found to be around 99% Cu, 60% Zn and 9% Ni with …

82% of copper can be extracted by 3 stages of extraction with 80% v/v LIX 54-100 at phase ration (0/A) of2/1. 80% of loaded copper can be stripped with 180 g!L H2S04 in one stage at phase …

Here we introduce an integrated metal recovery system combining leaching of metals from the target ASR waste using an ammonia lixiviant with electrodeposition, ammonia stripping, and ...

Sulfidic copper–lead–zinc tailings can pose a significant environmental threat, ranging from generation of acid mine drainage (AMD) to dam failures. On the other hand, they can also be considered as low-grade ore resources for zinc and copper provided that novel economically feasible metal extraction and metal recovery techniques are developed. Due to …

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 agents used in leaching.

However, solvent extraction is one of the most viable routes to extract copper from pregnant leach solution (PLS) among other methods such as precipitation, coagulation, …

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...

The paper concerns a hydrometallurgical method for selective recovery of copper from low-grade electric and electronic wastes. The following consecutive stages were …

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

In summary, it was possible to develop a novel process for the electrochemical deposition of copper from an ammoniacal copper catholyte using cationic ion exchange membranes to prevent the destruction of complexing …

Dissimilatory nitrate reduction to ammonium (DNRA) has garnered attention due to its ability to recover ammonia and reduce greenhouse gas emissions simultaneously. In this study, the potential of ...

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 …

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 …

Possible methods for recovering the copper from the leach solution are outlined, and the types of ores and concentrates for which ammonia leaching may prove to be a viable alternative …

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 ...

The most challenging issue associated with recycling the sludge generated from printed circuit boards (PCBs) is the separation of copper (Cu) from iron (Fe), using multi-stage leaching, or adding oxidizing and precipitating agents. Herein we investigated simple acid leaching to effectively extract copper and limit iron dissolution. Selective copper leaching was achieved …

If your copper sink is unsealed and has a green patina, use ammonia and salt to restore it. Here's what you'll need: Non-iodized salt; Clear, detergent-free ammonia; White vinegar; Clean, lint-free rag; Grease cutting mild dish soap; Spray bottle; Start by cleaning the sink's surface to remove any grease or residue.

Recovering ammonia from wastewater via electrochemical nitrate reduction would support a circular economy. Here the authors develop a membrane-free electrochemical system that allows efficient and ...

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 features of ...

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 ...

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 approach to effectively recover copper …

In this research we demonstrate the potential of development of a hydrometallurgical process for ICT waste recycling to effectively recover copper by using air as …

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 polymetallic and five-phase …

The reagents used in this study, such as ammonium thiosulfate, copper sulfate, ammonia, sodium chloride, sodium sulfite, sodium hydroxide and sulfuric acid were of analytically grade. ... (NH 4) 2 S 2 O 3 for 12 BV followed by gold elution with 2 mol/L NaCl + 0.5 mol/L Na 2 SO 3 for 10 BV, was adopted to recover copper and gold from the loaded ...

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 ...

Copper recovery, % 100 80 60 40 20 theoretical line 514 min-1 370 min-1 255 min-1 123 min-1 60 min-1 0 0 30 60 90 120 time, min Figure 4: The effect of stirring rate on copper recovery at a current density 1100Am-2 As it is seen in Fig.4, the copper recovery rate is independent of stirring rate in the range 60 – 255min-1 and approaches the ...