leaching copper ammonia

leaching copper ammonia

(PDF) Ammonia leaching in the copper industry: a review

In this process, ammonia leaching of sulfide minerals of copper, nickel, cobalt and iron was conducted at a. temperature of about 105 °C and air pressure of 8 ATM. Under

Ammonia Leaching: A New Approach of Copper Industry

2013-12-10 · Ammonia leaching was first used for recovery of non-ferrous metals such as copper from oxide ores or ores containing pure copper, but gradually the use of this technology was developed from more traditional elements of copper, nickel and cobalt to

(PDF) Ammonia Leaching: A New Approach of Copper

2021-11-10 · Optimal leaching was achieved and further refined for the ASR in a two-step indirect leaching system with biogenic ammonia. Copper leaching was the result of

AMMONIA LEACHING IN THE COPPER INDUSTRY: A

Ammonia leaching was first used for recovery of non-ferrous metals such as copper from oxide ores or ores containing pure copper, but gradually the use of this technology was developed from more ...

Optimal Conditions for Ammonia Leaching of Copper ...

2019-7-1 · Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching [16]. The ammonia leaching process is more environment friendly than conventional acid heap leaching, which uses sulphuric acid to dissolve copper and cobalt [11]. The reported difficulty encountered with the ammonia leaching approach, however,

Ammonia leaching of slag from direct-to-blister copper ...

2020-8-25 · Ammonia leaching of slag from direct-to-blister copper smelting technology. Smelting of copper concentrates in a flash furnace directly into a copper blister results

COPPER(II) EXTRACTION FROM AMMONIA LEACH

2013-9-7 · 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 ammonia sulfate as a leaching agent. Metals such as Cu, Ni, Co and Zn occur in ammonia systems as a cationic amminacomplexes. Alkalinity of the solution and free

Selective leaching of a copper ore by an electromembrane ...

2006-2-1 · Leaching of copper ores occurs by means of either acid leaching or ammonia leaching. It is known that acid leaching is not suitable for ores which contains carbonates such as covellite or limestone. In such case, ammoniac leaching is performed although it is often carried on with both high pressure and elevated temperature.

Characterization and kinetic study on ammonia leaching of ...

2014-5-1 · Ammonia leaching kinetics of a complex Cu-ore assaying 8.8% Cu and 36.1% Fe was examined. Mineralogical characterization indicated that the major phase of the ore was siderite with chalcopyrite as the major sulfide mineral. The effects of parameters such as agitation, temperature, NH 3 concentration, particle size and oxygen partial pressure ...

Investigation of Copper Ammonia Leaching from Smelter ...

2015-7-14 · Although ammonia leaching of copper from slags has been reported generally as a part of copper slag utilization methods, but no detailed studies have been reported in the literature. In this research, we tried to investigate the effect of different parameters on ammonia leaching of copper from copper smelting slag by identifying different copper-bearing phases and following them during ...

(PDF) Ammonia Leaching: A New Approach of Copper

2021-11-10 · Optimal leaching was achieved and further refined for the ASR in a two-step indirect leaching system with biogenic ammonia. Copper leaching was the result of local corrosion and differences in ...

Optimal Conditions for Ammonia Leaching of Copper ...

2019-7-1 · Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching [16]. The ammonia leaching process is more environment friendly than conventional acid heap leaching, which uses sulphuric acid to dissolve copper and cobalt [11]. The reported difficulty encountered with the ammonia leaching approach, however,

Ammoniacal System Mechanisms for Leaching Copper

Although different copper compounds have already been tested with this leaching alternative in different ammonia media such as malachite in ammonia/ammonium carbonate system , oxidized copper ore in ammonium chloride solution , complex copper in ammonia-ammonium chloride solution , malachite ore in ammonium nitrate solutions , tenorite and ...

Role of oxygen and ammonium ions in silver leaching with ...

2013-8-6 · The dissolution of silver with thiosulfate and copper ions was studied in a batch-stirred reactor at 25 °C in the absence and presence of various ammonium ions and oxygen concentrations in the aqueous solution. Leaching silver with 4 mg·L−1 oxygen in the aqueous solution requires high concentration of ammonium and thiosulfate ions. High silver dissolution is achieved at pH of high

Ammonia Leaching: A New Approach of Copper Industry

2013-10-1 · 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 approach in the world to this method.

Ammonia leaching - Phelps Dodge Corporation

An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach liquor is treated with a strongly alkaline ...

Effect of Preliminary Alkali Desilication on Ammonia ...

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 ammonium/ammonium-carbonate ...

Optimization of selective copper extraction from ...

2019-7-27 · The dissolution of copper and iron from chalcopyrite concentrate in the presence of ammonium persulfate (APS) and ammonium hydroxide was investigated under atmospheric leaching conditions. Experiments were designed by central composite design (CCD). Under the optimum leaching conditions ((NH4)2S2O8 concentration = 328 g/L; NH4OH addition = 16vol%; leaching temperature =

Ammoniacal System Mechanisms for Leaching Copper

Although different copper compounds have already been tested with this leaching alternative in different ammonia media such as malachite in ammonia/ammonium carbonate system , oxidized copper ore in ammonium chloride solution , complex copper in ammonia-ammonium chloride solution , malachite ore in ammonium nitrate solutions , tenorite and ...

Ammonia Leaching: A New Approach of Copper Industry

2013-10-1 · 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 approach in the world to this method.

Ammonia/nitric Acid Leaching of Copper- Cobalt

2015-3-4 · leaching kinetic and recovery of copper in ammonia+ nitric acid solution. The authors in , found 6h and pH 10 to give [8] the best leaching efficiency for copper, in their feasibility of copper leaching from an industrial sludge using ammonia solution. This present work will develop the effect of nitric acid/ammonia ratio on the leaching of ...

Thiosulfate-copper-ammonia leaching of pure gold and ...

2017-5-10 · Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate 1081 𝑓 Δ𝑚, (1) where C f is the sensitivity factor for the crystal used (56.6 Hz cm 2/µg), f is the frequency (Hz) and Δm is mass change (µg). A saturated silver-calomel electrode (Radiometer 401) SCE +0.241 V

DEVELOPMENT AND IMPLEMENTATION OF SOLVENT

2021-8-26 · Leaching of copper can be accomplished with ammonia solution in which metal such as copper is selectively extracted while restricting the dissolution of iron or manganese. Both metals can pose a real problem in the subsequent stages of hydrometallurgical processing -

Effect of Preliminary Alkali Desilication on Ammonia ...

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 ammonium/ammonium-carbonate ...

Copper Leaching Behavior from Waste Printed Circuit

reported the selective leaching of copper from motor scraps using cupric ammine solutions.1,2) Zhou et al. studied the removal of copper from ferrous scrap by an ammonia leaching method.3,4) In these studies, Cu(I) ions were obtained under an air or oxygen atmosphere as the reaction product, and then metallic copper would be electrowon from

Influences of ammonia contamination on leaching from air ...

For aluminium, chromium, iron and lead, ammonia had little impact on their leaching behaviour. With respect to cadmium, copper, nickel and zinc, high ammonia concentrations significantly increased leaching in the pH range of 8-12 due to the formation of metal-ammonia complexes, which was also proved in the speciation calculations.

Leaching of Malachite Ore in NH3-Saturated Water ...

2004-6-24 · In this study, the leaching kinetics of malachite [CuCO3·Cu(OH)2], an oxidized copper ore, was investigated in water saturated with ammonia gas. In the experiments, the ammonia concentration of the solution, the particle size of the ore, the temperature, the stirring speed, and the solid-to-liquid ratio were chosen as parameters. It was determined that the leaching rate of malachite increased ...

Kinetics and Mechanism of Copper Dissolution in Aqueous ...

Susumu Morioka, Kazuyoshi Shimakage, Studies on the Ammonia Pressure Leaching of Metallic Nickel and Copper Powders, Transactions of the Japan Institute of Metals, 10.2320/matertrans1960.12.197, 12, 3, (197-205), (1971).