ammonia leaching of pper

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

Oct 06, 2020  Ammonia leaching is a promising method for processing low-grade copper ores, especially those containing large amounts of oxidized copper

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

The effect of copper and ammonia addition on gold leaching kinetics was studied in the present paper. It will be shown that when the solutions do not contain copper, the addition of ammonia ...

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,

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

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

Dec 10, 2013  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

Characterization and kinetic study on ammonia leaching of ...

May 01, 2014  In general, the major advantage of ammonia leaching process lies in its selectivity towards copper since ammonia forms soluble ammine complex with Cu ions and iron is completely rejected as iron oxides. Aqueous ammonia as a leaching agent is fairly non-corrosive and leaching reactions occur in relatively mild conditions [9].

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,

Characterization and kinetic study on ammonia leaching of ...

May 01, 2014  In general, the major advantage of ammonia leaching process lies in its selectivity towards copper since ammonia forms soluble ammine complex with Cu ions and iron is completely rejected as iron oxides. Aqueous ammonia as a leaching agent is fairly non-corrosive and leaching reactions occur in relatively mild conditions [9].

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

Novel treatment for mixed copper ores: Leaching ammonia ...

Apr 01, 2020  Ammoniacal leaching for dissolution of copper oxides. • The pH in leaching should be controlled between pH 9–10. • Ammonia leaching does not alter copper sulfides. • PLS precipitates with S or SO 2 to form CuS and/or Cu2S. • Excess sulfur (150–200%) is more suitable for precipitation of Cu. •

Copper-Ammonia Complex Chemdemos

Copper-Ammonia Complex . When concentrated ammonia solution (ammonium hydroxide) is added to a clear, light blue, aqueous solution of copper(II) chloride, a powdery, light blue precipitate of copper(II) hydroxide forms. Further addition of ammonia causes the copper ion to go back into solution as a deep blue ammonia complex.

Copper extraction from the ammonia leach liquor of spent ...

May 01, 2020  A novel process to remove copper from the ammonia leaching solution of spent lithium ion battery was developed by using LIX984 dissolved in 260 # kerosene as extractant. The pH is a key factor affecting the extraction Cu and other coexisting ions (Li, Co, and Ni).

The Effect of Leaching Time and Ammonia Concentration

of copper in their investigation on the oxidative ammonia/ammonium sulphate leaching of a complex synthetic matte (Cu-Ni-Fe-Co). Chang and Liu studies on the feasibility of copper leaching from industrial sludge using ammonia solutions managed to recover 94% of copper

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

Feb 01, 2015  Ammonia leaching for the removal of copper was performed at 1 mol/L NH 3 and the cyanide leaching of the residue was carried out at 1.5 g/L NaCN. The reactors were agitated by overhead stirrers at a constant stirring speed of 600 r/min. Air was supplied to the reactors at a flow rate of 2 L/min. The top of the beakers was kept covered during ...

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

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 ...

The selective leaching of copper from a gold–copper ...

gold leaching either using the same process at elevated temperature (40–60 °C), as patented by the authors, or using a cyanidation process. Copper selective leaching will reduce the gold losses due to a cementa-tion mechanism of gold in the presence of metallic copper as all of the metallic copper will dissolve in the pre-leaching stage.

Characterization and kinetic study on ammonia leaching of ...

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 Principles and Applications of Ammonia Leaching of ...

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.

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.

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

Aug 25, 2020  Chmielewski T, Wódka J (1997) Recovering of silver and copper from silver-bearing waste slag by ammonia leaching. Physicochem Probl Miner Process 31: 51-61. [21] Ochromowicz K, Jeziorek M, Wejman K (2014) Copper(II) extraction from ammonia leach solution. Physicochem Probl Miner Process 50: 327-335.

Leaching of a copper sulfide concentrate in an ammonia ...

Leaching of copper from Morenci concentrate, a min­ eral containing mostly pyrite and covellite, was studied in an ammonia^oxygen system at low temperatures (45° C to 85° C) and pressures (5 psi to 25 psi) «, The copper has been found to be leached, completely after three hours of reaction at temperatures lower than 100 C.

Behavior of Copper Dissolution in an Ammonia Solution ...

The leaching speed of copper in an ammonia solution containing ammonium chloride was higher than that in an ammonia solution containing ammonium sulfate. Key words Copper Dissolution, Ammonia Solution, Waste, Leaching, Hydrometallurgical Process 1. Introduction The metals recovery from waste materials is important for

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.

Copper-Ammonia Complex Chemdemos

Copper-Ammonia Complex . When concentrated ammonia solution (ammonium hydroxide) is added to a clear, light blue, aqueous solution of copper(II) chloride, a powdery, light blue precipitate of copper(II) hydroxide forms. Further addition of ammonia causes the copper ion to go back into solution as a deep blue ammonia complex.

Technical Overview August 2019

Typical Capital and Operating Costs for Copper Heap Leaching An analysis of the economics of the AmmLeach® process compared with conventional acid leaching for high acid consuming copper ores is dependent upon a multitude of parameters specific to the mineralogy of the deposit and its location. ... gangue minerals during leaching, ammonia is ...

The Effect of Leaching Time and Ammonia Concentration

of copper in their investigation on the oxidative ammonia/ammonium sulphate leaching of a complex synthetic matte (Cu-Ni-Fe-Co). Chang and Liu studies on the feasibility of copper leaching from industrial sludge using ammonia solutions managed to recover 94% of copper

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.

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

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 ...

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

The selective leaching of copper from a gold–copper ...

gold leaching either using the same process at elevated temperature (40–60 °C), as patented by the authors, or using a cyanidation process. Copper selective leaching will reduce the gold losses due to a cementa-tion mechanism of gold in the presence of metallic copper as all of the metallic copper will dissolve in the pre-leaching stage.

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

Abstract: 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.

Ammoniacal thiosulphate leaching of gold ore

concentration. The leaching is improved significantly at a particular ratio of ammonia to thiosulphate concentration and that ratio varies from ore to ore. Copper ions act as an oxidant and the gold dissolution increases substantially in the presence of them. The gold leaching is minimum in the presence of an inert

Ammoniacal leaching and recovery of copper from alloyed ...

copper recovery directly from PCBs and reported the highest leaching efficiency for ammonia–ammonium per-sulfate solution. At optimum conditions, 90 % Cu, 60 % Zn and 9 % Ni were dissolved from the waste in 10 h. Copper with a purity of 99.97 % was obtained in the subsequent electrowinning step. The aim of this work was to investigate the ...

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