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ammonia leaching of copper

Ammonia Leaching: A New Approach of Copper Industry in ...

Dec 10, 2013  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

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(PDF) Ammonia Leaching: A New Approach of Copper Industry ...

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 ...

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COPPER(II) EXTRACTION FROM AMMONIA LEACH SOLUTION

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

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(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 these c onditions, copper ...

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Leaching of copper from tailings using ammonia/ammonium ...

Aug 03, 2010  The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were investigated. The main important parameters in ammonia leaching of copper ...

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Ammonia Leaching: A New Approach of Copper Industry in ...

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

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TREATMENT OF A COPPER - RICH GOLD ORE BY AMMONIA

improved to >90%. Similarly, the pretreatment of the ore by ammonia leaching was shownto lead to high gold extractions (98%), in subsequent cyanide leaching with significant reductions in the consumption of cyanide. This appeared to be linked with the ready dissolution/removal of copper during ammonia leaching.

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Characterization and kinetic study on ammonia leaching of ...

May 01, 2014  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 ...

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Selective leaching of copper and zinc from primary ores ...

Feb 05, 2021  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 leaching against the synthetic (NH 4) 2 CO 3 control could be accounted for by pH shifts from microbial metabolism, subsequently altering free NH 3 ...

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(PDF) A STUDY OF LEACHING OF COPPER OXIDE ORE BY

After adjusting the pH of the leaching solution to 7 by ammonia addition, the copper and cobalt in the solution were precipitated by ammonium bicarbonate at 60 °C for 40 min. Ammonium chloride ...

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AMMONIA LEACHING IN THE COPPER INDUSTRY: A REVIEW

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 ...

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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 approach in the world to this method.

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Investigation of Copper Ammonia Leaching from Smelter ...

Jul 14, 2015  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 ...

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Selective leaching of copper and zinc from primary ores ...

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 leaching against the synthetic (NH 4) 2 CO 3 control could be accounted for by pH shifts from microbial metabolism, subsequently altering free NH 3 ...

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Copper Recovery From Ammonia Solutions Through Electro ...

Jan 28, 2021  On the other hand, ammonia plays an important role in the process since it is involved in the formation of cupric ion complexes in the copper leaching such as [Cu (NH 3) 4] 2+; in addition, its concentration influences the presence of other unwanted substances, such as copper oxide. Likewise, there is a constant competition between ammonia and ...

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

Aug 25, 2020  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 in the production of slag with high copper and lead content. The recovery of these metals is carried out in an electric furnace, from which copper–lead–iron metallic alloy is ...

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The Effect of Leaching Time and Ammonia Concentration on ...

【Abstract】 The effects of ammonia concentration and leaching time were investigated to determine the optimum leaching conditions. The experiments were conducted in a leaching cell submerged in a water bath, with ammonia concentrations of 1.5 M, 2.0 M, 2.5 M and 3.0 M and varying leaching time from 0 to 300 min. Ni-Cu matte containing 23% by mass Cu was used in this experimental study.

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Use of Ammonia Salts in Selective Copper Extraction from ...

Jun 03, 2020  The highest copper extraction efficiency was obtained in the leaching process that was conducted with the solutions obtained by mixing ammonia salts in the best conditions. Accordingly, as a result of 6 h of leaching at 30 °C in the presence of 22.5% NH 4 OH and 100 g/L (NH 4 ) 2 S 2 O 8 , 91.47% of the copper was transferred into the solution ...

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TREATMENT OF A COPPER - RICH GOLD ORE BY AMMONIA

improved to >90%. Similarly, the pretreatment of the ore by ammonia leaching was shownto lead to high gold extractions (98%), in subsequent cyanide leaching with significant reductions in the consumption of cyanide. This appeared to be linked with the ready dissolution/removal of copper during ammonia leaching.

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Treatment of copper-rich gold ore by cyanide leaching ...

leaching, ammonia leaching has the merits of high selectivity over gang minerals, low corrosivity and application in alkaline conditions [8]. MUIR et al [8] demonstrated the removal of copper (up to 95%) from an oxidised tailings via ammonia leaching, which resulted in a substantially reduced reagent consumption (from 30

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Leaching of gold and copper minerals in cyanide deficient ...

Aug 01, 2005  Fundamental studies recently published have shown that the addition of ammonia decreased the gold leach rate in the absence of copper, had little effect on the leaching of gold by Cu(CN) 3 2−, but does increase the leaching kinetics when the major cyanide species present is Cu(CN) 2 − (Jeffrey et al., 2002). The presence of copper(II) was ...

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ADSORPTION LOSSES IN AMMONIA LEACHING OF COPPER,

In ammonia leaching cobalt extraction generally does not exceed 50%, whereas copper and nickel recoveries in excess of 85% are achieved. Since manganese nodules possess high specific surface areas, the poor cobalt recovery may be related to the presence of finely divided leach residues.

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(PDF) Industrial Application of Ammonia Assisted Cyanide ...

When ammonia was introduced into the industrial agitation leach plant, there was no improvement in the extraction of gold, in contrast to the bottle roll tests, but the extraction of copper was halved, thus leading to significant reductions in the amount of cyanide consumed in the full-scale leaching system.

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Optimal Conditions for Ammonia Leaching of Copper ...

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,

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Leaching of copper concentrates - University of Arizona

SURVEY OF PROPOSED METHODS FOR LEACHING COPPER SULFIDES 0000000 000000 Ammonia Pressure Leaching Cyanidation Ferric Chloride Leach Acid Chlorine Leach Ferric Sulfate Leach Direct Acid Pressure Leaching Bacterial Leaching . Conclusions o o o 0 0 o o O O O O O O O O O O O O O O O o 0 0 o o o o o o o e o o o o o o o o o o

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A KINETIC STUDY OF THE LEACHING OF CHALCOCITE IN AN ...

The hydrometallurgical leach recovery of copper from Tyrone chal- cocite concentrate had been studied in an ammonia-oxygen system. It has been found that the iron pyrite present in the concentrate will be con­ verted to iron oxide in order to satisfy the sulfur demand of the copper leaching.reactions.

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ADSORPTION LOSSES IN AMMONIA LEACHING OF COPPER,

In ammonia leaching cobalt extraction generally does not exceed 50%, whereas copper and nickel recoveries in excess of 85% are achieved. Since manganese nodules possess high specific surface areas, the poor cobalt recovery may be related to the presence of finely divided leach residues.

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Ammoniacal leaching and recovery of copper from alloyed ...

Nov 26, 2014  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 system. It was leached in ...

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The Principles and Applications of Ammonia Leaching of ...

Mar 26, 2008  Eh-pH diagrams of various metal-ammonia-water systems are presented. Also presented is a comprehensive literature survey on the leaching behavior of metals in ammoniacal solutions. The metals considered in this paper are copper, cobalt, nickel, zinc, cadmium, silver, gold and palladium.

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

Jun 24, 2004  In this study, the leaching kinetics of malachite [CuCO3Cu(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

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Copper, zinc, and nickel recovery from printed circuit ...

Apr 16, 2021  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 complexes, implying higher consumption of ammonia to obtain high copper recoveries. This research aimed to clarify under which conditions copper, zinc, and nickel can be leached from some

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Ammonia Leaching: A New Approach of Copper Industry in ...

Ammonia Leaching: A New Approach of Copper Industry in Hydrometallurgical Processes Radmehr, Vahid; Koleini, Seyed Mohammad Javad; Khalesi, Mohammad Reza; Tavakoli Mohammadi, Mohammad Reza download BookSC. Download books for free. Find books

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Leaching kinetics of low nickel matte in an aqueous ...

Aug 01, 2021  By introducing an acid pre-leaching process into the oxidative ammonia leaching process, we achieved the high extraction efficiencies of 98.03%, 99.13%, and

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Woode, Acheampong, Azanu - 2014 - Academia

Ammonia leaching is also selective in that it will not dissolve all available nonspecific The extractive metallurgy of copper is largely based on the metals, such as iron and manganese, along with the copper or conventional pyrometallurgical treatment process which cobalt, as sulphuric acid does.

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[PDF] Thiosulfate-copper-ammonia leaching of pure gold and ...

In this research cyanide-free leaching of pure gold and pressure oxidized refractory gold concentrate by thiosulfate-copper-ammonia solutions were examined. A quartz crystal microbalance (QCM) was used to study gold leaching as a factorial series where the best gold leaching rate (2.987 mg/(cm∙h)) was achieved with a solution consisting of 0.2 M (NH4)2S2O3, 1.2 M NH3, 0.01 M CuSO4 and 0.4 M ...

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Characterization and kinetic study on ammonia leaching of ...

Aqueous ammonia as a leaching abundant source of sulfide copper in the earth’s crust; agent is fairly non-corrosive and leaching reactions occur and 2) it is one of the most refractory sulfide copper in relatively mild conditions [9]. The best known minerals [1].

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INVITED REVIEW PAPER Leaching kinetics of a Nigerian ...

Characterization and kinetic study on ammonia leaching of complex copper ore. By ayonbala baral. A Review on Novel Techniques for Chalcopyrite Ore Processing. By Olushola Sunday Ayanda. Kinetic modeling of bioleaching of copper sulfide concentrates in

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