Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost easy recovery and high selective recovery of metals New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching have resulted in a new
In the ten years from 2003 to 2013 global mine production of copper has increased by over 23% to meet demand while the weighted average head grade has dropped from to % Cu
The increased demand of copper Cu in the global market has an emphasis on its recovery from the secondary resources such as printed circuit boards PCB waste metal containing sludge slag fly ash and industrial effluents to satisfy both the aspects economics and environmental protection Kilicarslan et al 2013; Ahmed et al 2016 The reason being Cu is
Examples of two copper recovery cycles and their relationship with variable X7 a shows levels of leaching ratio for cicle 1 and cicle 2 while b shows the different values of the variable Y
Pachuca Leaching Tank The Brown or Pachuca agitator as it is most commonly known originated in New Zealand in the early days of cyanidation leaching the invention of F C Brown It later became popular in Mexico and to a limited
In this study recovery of copper from solid material obtained by leaching of chalcopyrite with oxalic acid in the presence of hydrogen peroxide with a copper oxalate structure was carried out selectively using HCl The chemical composition of the solid was as % % and % for Cu Fe and S respectively Selective recovery of copper by degrading the
Examples of two copper recovery cycles and their relationship with variable X7 a shows levels of leaching ratio for cicle 1 and cicle 2 while b shows the different values of the variable Y
conducted at a coarser size fraction than agitated tank leaching thus reducing the power requirement and reagent consumption These eco nomic benefits make the use of heap leaching technique beneficial for the extraction of precious metals copper nickel and cobalt from low grade minerals and mining waste Quaicoe et al 2014; Ghorbani et al
The copper leaching kinetics were promoted by the generation of sulfuric acid due to pyrite oxidation It was also confirmed that a low iron concentration g/L and a high copper concentration g/L obtained in the stripped solution resulted in an improved copper electrodeposition current efficiency during copper electrowinning
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 Optimum leaching
Hernandez et al [47] proposed the recovery of copper from pregnant leaching solutions using a reactive electrodialysis cell equipped with two anionexchange membranes and a bipolar electrode
The copper concentrate obtained from the flotation of tailings [30] was used as feed sample in this achieve an excellent copper dissolution from the concentrate of flotation tailings which consist of chalcopyrite as the major copper component high‒pressure leaching HPL was conducted using an autoclave under a variety of sulfuric acid concentration
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
The treatment of copper cobalt bearing ores by hydrometallurgical process requires a preliminary leaching step However the majority of copper and cobalt bearing ores mined in the Democratic Republic of Congo and particularly in the Katanga province contain cobalt as a heterogenite with a fairly large proportion as trivalent cobalt Kime 2017
Industrial processing of mineral ores and concentrates generates large amounts of solid residues which can be landfilled or further processed to recover selected elements depending on its economical profitability Pressure leaching is a technology enabling high recovery of base metals like copper and zinc transferring others like lead and iron to the solid
The aim of this research was to develop a copper recovery process from mine tailings %Cu using flotation followed by high pressure oxidative leaching HPOL and solvent extraction initial O/A = inserted into a plastic tube and mixed by an agitator at 600 rpm After adjusting the pH of the mixture to the desired value pH
leaching of flotation tailings from Bor Copper Mine using sulfuric acid and iron III sul‐ fate as an oxidant and obtained a copper recovery of 80% after 2 h highlighting that the
Nowadays the recycling of metals from electrical and electronic waste is of great relevance due to its direct and indirect impact on environmental social and economic fields Therefore this study conducted at the laboratory level focuses on the recovery of copper from printed circuit boards through dynamic acid leaching in an H2SO4 O2 system with the stirring
The leaching recovery of copper in the minerals was % for tenorite % for malachite and % for azurite The global leaching recovery of copper was evaluated at % The cobalt recoveries from asbolane and heterogenite were and % respectively The total leaching recovery of cobalt was assessed at %
Sokić et al [7] performed acid leaching of copper from a copper oxide sulphide ore excavated from the copper mine Cerovo a part of the RTB Bor These authors reported the leaching degree of
Leaching is a step in hydro and electrometallurgical processes and has been also employed for the recovery of metals from waste of electrical and electronic equipment WEEE The process may be preceded by a mechanical pretreatment of the waste see Chap 6 and followed by purification and metal recovery from the solution see Chaps 8 and 9
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 pyrometallurgy which usually involves a series
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