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Method for ammoniacal leaching of copper from oxidised copper …

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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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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The Principles and Applications of Ammonia Leaching of …

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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Copper ammonia leaching from smelter slag

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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(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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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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Autoclave Ammonia Leaching of Silver from Low-Grade Copper …

Autoclave ammonia leaching of silver from low-grade copper concentrates is studied with use of Zhezkazgan concentrates of the following composition, %: 9.55 Cu, Fe 4.84, S 5.6, 27.03 Si, 109.6 g/ton Ag. According to X-ray phase analysis the main minerals present in the concentrate are, %: 29 quartz (SiO2 ), 33 plagioclase ((Ca, Na)(Al, Si)AlSi2O6 ), 16 mica, 10 …

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Effect of copper impurity in ammonia leachate on the structure …

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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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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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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Copper Leaching Practices

Oxidized copper ores, mixed oxide-sulfide ores, and those sulfide ores too low in grade to concentrate by froth flotation are treated by various copper leaching methods.

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Ammoniacal Solvoleaching of Copper from High …

The copper silicate ore chrysocolla forms a large potential copper resource, which has not yet been fully exploited, due to difficulties associated with its beneficiation by flotation and metallurgical processing. Direct acid leaching …

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AMMONIA LEACHING IN THE COPPER INDUSTRY: A …

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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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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(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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A review of the selective leaching of gold from oxidised copper…

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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Modulating the carbon chain length of organic phosphine for the

The selective recovery of gold ions from gold leaching solutions limits the industrial application of the copper-ammonia (Cu 2+ –NH 3)-thiosulfate system.Here, the influence of the carbon chain length of organic phosphines on the selective recovery of gold ions was studied, and an extractant (trihexylphosphine, THP) that is suitable for the selective recovery of gold ions …

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Ammoniacal leaching and recovery of copper from alloyed low …

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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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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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 and recovery of copper from alloyed low …

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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Ammoniacal Leaching for the Extraction of Valuable Metals from

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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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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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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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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COPPER(II) EXTRACTION FROM AMMONIA LEACH …

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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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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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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The aqueous chemistry of the copper-ammonia system and its …

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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