This paper highlights the use of ammoniacal leaching for successful extraction of metals like nickel, cobalt, copper, zinc, vanadium, and molybdenum from diverse sources such …
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Conventional methods of leaching copper oxide minerals involve using acids, particularly sulfuric acid. However, these can lead to several challenges, ... showing promise as a selective copper-leaching agent [22]. Still, ammonia presents challenges like toxicity, adverse effects on skin and eyes [46], and difficulties in recycling and reusing ...
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The procedure involves three stages: (i) leaching with aqueous ammonia solutions at room temperature and varied pH, ammonia concentration, solid concentration, and particle size; (ii) PLS precipitation in copper sulfides by the addition of sulfur (or other copper sulfates) and SO 2 (or additional sulfites or bisulfites); (iii) froth flotation ...
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In thiosulfate leaching of gold, the copper-ammonia complex serves as an oxidant and catalyst. This study examined the impact of magnetizing the copper-ammonia thiosulphate lixiviant solution on gold leaching from refractory oxidized ores. Magnetization reduced surface tension, improved wettability and infiltration, and enhanced the diffusion of leaching agents. It …
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Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper. In this paper, we study the effect of Si-containing minerals on the kinetics of Cu and Ag leaching from low-grade copper concentrates. The results of experiments on the pressure leaching of the initial copper concentrate in an …
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a method for leaching copper from an oxidised copper ore wherein at least 5% of the copper present in the oxidised copper ore is in the form of an oxidised copper compound comprising the method steps of: applying an aqueous solution of a curing agent to the oxidised copper ore, producing a cured ore; forming a leach solution by applying an ammoniacal solution that has …
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Alkaline ammonia–ammonium salt solutions show some advantages in the leaching of polymetallic materials [8 – 11], since dissolution of copper is specific (autocatalytic): …
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Chalcopyrite is well known as being refractory to conventional leaching approaches at atmospheric pressure. The current study investigated a hybrid approach using aqueous ammonia as a pH modifier for glycine-based lixiviant systems to leach copper from chalcopyrite while maintaining surface refreshment using ceramic media at room temperature. …
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The present article reviews the use of ammonia and ammonia-ammonium salt leaching systems to extract valuable metals from secondary resources. This paper highlights the use of ammoniacal leaching for successful extraction of metals like nickel, cobalt, copper, zinc, vanadium, and molybdenum from diverse sources such as spent batteries, printed ...
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The current study investigated a hybrid approach using aqueous ammonia as a pH modifier for glycine-based lixiviant systems to leach copper …
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Ammonia leaching of sulfide copper concentrates generate buffer type liquors (pH ranges from 9 to 10), because of the excess of ammonia and significant amount of ... Very often it appears that the second method is . Copper(II) extraction from ammonia leach solution 329 more cost-effective, because it requires less stages comparing to the first ...
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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 …
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In this paper, an attempt was made to describe the basis and different ammonia leaching methods and present the major research activities in this field for copper. Also latest findings and …
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An ammonia leaching method for recovering valuable metals from nickel and cobalt solid wastes was demonstrated, which provides an idea for the recovery and materialization of nickel and cobalt solid waste resources. The ammonia leaching system consists of NH 3 ·H 2 O-(NH 4) 2 SO 3. NH 3 ·H 2 O and NH 4 + work together to increase free NH 3 ...
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In this paper, an attempt was made to describe the basis and different ammonia leaching methods and present the major research activities in this field for copper. Also latest findings and related novel processes have been presented.
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different ammonia leaching methods and present the major research activities in this field for copper. We have also presented the latest findings and related novel processes. Comparative assessment of
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There are several works in literature where SCM models were applied in recent years [128][129][130][131], for example, Nadirov et al. [128] model copper ammonia leaching from smelter slag ...
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In the process of ammonia leaching, compared with Co(OH) 2, Co(OH) 3 is difficult to form coordination compounds with ammonia in the solution, resulting in less leaching of cobalt. As a result, a reducing agent can be added to the ammonia leaching process to convert trivalent cobalt to divalent cobalt, strengthening the leaching of cobalt.
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The ammonia leaching method can efficiently recover the spent Lithium-ion batteries (LIBs), and the reuse of ammonia leachate is a difficult problem. ... Copper extraction from the ammonia leach liquor of spent lithium ion batteries for regenerating LiNi 0.5 Co 0.5 O 2 by co-precipitation. Hydrometallurgy, 193 (2020), p. 105310, 10.1016/j ...
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Further, an ammonia leaching method was used to leach copper gently. The leaching kinetic behavior of copper foil particles with different particle sizes was analyzed. ... The leaching experiment was carried out with ammonia leaching method in 100 ml conical flask, and the leaching time was set as 5, 10, 20, 30, 45 and 60 min. A conical flask ...
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In this paper, we have attempted to describe the basis and different ammonia leaching methods and present the major research activities in this field for copper. We have …
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The paper presents results of extraction of copper(II) from ammonia leach solutions. The effect of a type of extractant, its concentration and type of diluent in organic phase on extraction ...
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The dissolution of copper during the leaching of chalcopyrite in ammonia solutions is an attractive alternative to acid sulfate leaching in the treatment of ores with high …
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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. ... (copper extraction was still affected). It has been intensively reported that both ammonia and glycine can leach copper efficiently by complexation as ...
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2013). Ammonia leaching is also selective in that it will not dissolve all available nonspecific metals, such as iron and manganese, along with the copper or cobalt, as sulphuric acid does. Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching (Park et al., 2006). The ammonia leaching process is more environment
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The ammoniacal leaching has been considered very selective for copper compared with other leaching systems; however, there are interactions with zinc and nickel that also form stable ammonia ...
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In considering the applicability of ammonia leach methods for treating material of this composition, ... Fig. 1-Flow diagram of leaching and copper-removal circuits. 458-JOURNAL OF METALS, MARCH 1955 ~ SOLUTION Fig. 2-Diagrammatic representation of leaching sulphide ...
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The ammonia leaching method has the advantages of the high recovery of copper and nickel, outstanding selectivity, and weak corrosiveness. However, the shortcomings of ammonia volatility and poor operating environment hinder its industrial application. The biological leaching method refers to the leaching of electroplating sludge through ...
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Selective leaching processes for copper, gold, nickel, and cobalt have been investigated because there is an advantage of ammoniacal hydrometallurgy that metal such as copper could be selectively ... Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper. ...
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Oxidative ammoniacal leaching of copper/chalcocite-rimmed pyrite has been studied with the aim of searching for the optimal conditions for the separation of the pyrite that would preclude the …
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A novel and efficient ammonia leaching method for recycling waste LIBs is proposed in this study. The leaching system selected in this study is composed of NH 3 ·H 2 O–NH 4 HCO 3 and Na 2 SO 3.This is because, on the one hand, NH 4 HCO 3 forms a relatively stable buffer system with NH 3 ·H 2 O, providing a suitable condition for leaching. At the same time, the …
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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 …
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This method provided an overall 89% copper recovery under atmospheric condition. The use of sulfuric acid as the leaching agent was found to be more advantageous than ammonia due to the complex interlocking nature of copper bearing particles and different reaction kinetics of the slag.
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The ammonia–cyanide leach system was first patented over 100 years ago and stands out as a unique method of selectively leaching up to 90% Au and <1% Cu from oxidised copper–gold ores using <10% NaCN used in conventional cyanidation processes.However, the system has proved to be difficult to control and predict performance with different ores due to a …
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The dissolution of copper during the leaching of chalcopyrite in ammonia solutions is an attractive alternative to acid sulfate leaching in the treatment of ores with high consumption of acid.
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The paper concerns itself with the low-pressure ammonia-ammonium sulphate leaching of copper concentrates. The mixing system, …
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The treatment of a copper sulphide-bearing gold ore by direct cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching was investigated. Dissolution behaviour of gold and copper in ...
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