A novel and efficient ammonia leaching method for recycling …

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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Ecofriendly leaching agents for copper extraction—An overview …

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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Importance of mineralogy and reaction kinetics for selecting leaching

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 aqueous chemistry of the copper-ammonia system and

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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Research on Enhancing Copper-Ammonia-Thiosulfate Eco …

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: A New Approach of Copper Industry in

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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Novel treatment for mixed copper ores: Leaching ammonia – …

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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Eco-friendly strategy for advanced recycling waste copper from …

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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A new method of full resource utilization of copper slag

Copper slag: Ammonia leaching: Aqueous NH 3 ... In the acid leaching method, sulfuric acid is the best leaching agent (Mussapyrova et al., 2021). When the concentration of sulfuric acid increases, the leaching efficiency of metal can be improved, but the silicon dissolved from fayalite will form silica gel, which will affect the subsequent ...

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Physical pre-concentration and ammonium leaching of metal copper …

Copper from WPCBs was leached from sulfuric acid solution by electrochemical oxidation method. Copper leaching rate of could be achieved with reaction time of 3.5 h (Zhu et al., 2009). ... When the temperature is 5 °C, the low temperature inhibits the reaction between ammonia and copper, resulting in a low copper leaching rate. ...

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Leaching Thermodynamics of Low-Grade Copper Oxide Ore from …

The ammonia leaching method is the most effective leaching method for high-alkaline gangue and low-grade copper oxide . The copper in the ore is dissolved into the solution by forming stable complex ions with ammonia, while impurities such as calcium and magnesium do not participate in the reaction, so that the target metal and impurities such ...

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Ammoniacal Leaching for the Extraction of Valuable Metals from

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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Ammonia Leaching: A New Approach of Copper …

The paper concerns itself with the low-pressure ammonia-ammonium sulphate leaching of copper concentrates. The mixing system, …

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Extraction of Copper from Chalcopyrite Using Alkaline Glycine–Ammonia

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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An Ammonia Leaching Process for the Recovery of Value Metals …

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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(PDF) Cyanide-Free Gold and Copper Extraction Method

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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Selective complexation leaching of copper from copper smelting …

For the leaching of copper smelting slag, sulfuric acid leaching and ammonia leaching are commonly used at present [14], [15]. Because the copper smelting slag contains a large amount of alkaline gangue, the dissolution of alkaline gangue in the leaching process not only consumes a lot of acid, but also results in high content of metal ions in ...

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Ammonia Leaching: A New Approach of Copper Industry in

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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Ammonia leaching in the copper industry: a review

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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Effect of Preliminary Alkali Desilication on Ammonia Pressure Leaching

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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(PDF) Ammonia Pretreatment of a Gold-Copper Ore to

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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(PDF) Copper(II) extraction from ammonia leach solution

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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Innovative technology and mechanism for comprehensive …

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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AMMONIA LEACHING IN THE COPPER INDUSTRY: A …

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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Chemistry of the Ammonia Pressure Process for Leaching Ni,

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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Ammoniacal Leaching for the Extraction of Valuable Metals from

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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Ammonia Leaching: A New Approach of Copper Industry in

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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Kinetics analysis of copper extraction from copper smelting slag …

The results indicated that the copper leaching kinetic conforms to the shrinking core model, and the overall leaching reaction was controlled by the internal diffusion control with an activation energy of 11.22 KJ/mol. ... The acid leaching process offers several advantages over the ammonia leaching method, including a more streamlined flow ...

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Optimal conditions for ammonia leaching of …

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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Ammonia leaching process for selective extraction of nickel and …

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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