ammonium carbonate leaching of copper

Leaching Coarse Native Copper Ore With Dilute

2021-10-8  Experiments on ammonium carbonate leachng of native copper ores crushed to 1-inch size showed that in 30 days 55 percent of the copper was extracted from 0.7 percent copper conglomerate-type ore, and 85 percent was extracted from 2.1 percent copper amygdaloid-type ore. Cupric ions were not necessary to initiate leaching, and dilute solution containing only 2.2 Grams per liter nh3 and 1.9

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Leaching kinetics of copper flotation tailings in aqueous ...

2012-4-9  The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with

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Ammonia leaching - Phelps Dodge Corporation

Preferably, the leaching step is carried out with an ammonium carbonate solution containing a molar excess of ammonium carbonate relative to copper, e.g., 20-50%, preferably about 30%, molar excess of ammonium carbonate, and containing free ammonia, e.g., 10-50 grams of ammonia per liter of leaching solution, preferably about 25 grams of ...

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Comparison of various extractants for recovery of

2021-11-10  Comparison of various extractants for recovery of Copper from Sarcheshmeh Chalcopyrite concentrate Ammonia/Ammonium Carbonate Leaching M. Ghanbari1, H. Naderi1* and M. Torabi2 1. Mining and Metallurgical Engineering Department, Yazd University, Yazd, Iran 2. Research Development Division, Sarcheshmeh Copper Complex, Kerman, Iran

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Dissolution kinetics of malachite in ammonia/ammonium ...

2005-1-1  The leaching of oxide copper ore containing malachite, which is the unique copper mineral in the ore, by aqueous ammonia solution has been studied. The effect of leaching time, ammonium hydroxide, and ammonium carbonate concentration, pH, [NH 3]/[NH 4 +] ratio, stirring speed, solid/liquid ratio, particle size, and temperature were investigated ...

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Behavior of Copper Dissolution in an Ammonia Solution ...

an ammonia solution containing ammonium carbonate, and reported that the leaching speed increased with increasing Cu(II) concentration, O2 gas flow rate and bath temperature [6]. However, the copper dissolution in an ammonia solution containing ammonium chloride has not been reported yet.

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Studying on Leaching Process of African Copper Oxide Ore ...

2021-8-10  Abstract Ammonium carbonate is used as leaching agent. The low grade African copper oxide ore is leached in ammonium carbonate solution decomposing to ammonia during heated. The effects of particle size of copper ore, concentration of ammonium carbonate, solid-to-liquid ratio, leaching temperature, leaching time and stirring rate on leaching ...

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Comparison of various extractants for recovery of Copper ...

Solvent extraction of copper from the copper leach solution obtained from the ammoniacal carbonate leaching of the Sarcheshmeh copper concentrate was carried out, and the performance of CP-150, LIX984N, and Kelex100 as well as the effects of different parameters involved were investigated. According to the results obtained, the extraction kinetics of all the three extractants was fast.

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Kinetics of copper dissolution - CORE

2020-2-6  ammonia, ammonium carbonate, and copper ammonium carbonate (37). Perhaps, leaching copper oxide ores treated with a preliminary reducing roast is economically feasible. Although leaching copper with ammonia is commercially applied, the nature of the reaction is not well understood. Several contradictions exist in the results of earlier investi ...

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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

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Leaching kinetics of copper flotation tailings in aqueous ...

2013-4-1  The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%. Effects of lixiviant concentration, solid‐to‐liquid ratio, stirring speed, and ...

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Ammoniacal leaching and recovery of copper from alloyed ...

2014-11-26  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

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Leaching Coarse Native Copper Ore With Dilute

2021-10-8  Experiments on ammonium carbonate leachng of native copper ores crushed to 1-inch size showed that in 30 days 55 percent of the copper was extracted from 0.7 percent copper conglomerate-type ore, and 85 percent was extracted from 2.1 percent copper amygdaloid-type ore. Cupric ions were not necessary to initiate leaching, and dilute solution containing only 2.2 Grams per liter nh3 and 1.9

More

Leaching kinetics of copper flotation tailings in aqueous ...

2012-4-9  The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with

More

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

reported that ammonium carbonate is advantageous over other species due to its relative low toxicity and stability of free NH3 and the resulting metal ammine complex by carbonate (Jha et al., 2001; Zapp et al., 2012). Copper leaching of metals from solid matrices by ammonium carbonate is well documented.

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The Effect of Leaching Time and Ammonia Concentration

ammonium carbonate being 0.3 M for the system, with a leaching time of 120 minutes giving them over 98% of copper recovery. Highest recovery for ammonia alone was 53% with only 5% of copper being recovered when using ammonium carbonate. The increase in recovery of

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Studying on Leaching Process of African Copper Oxide Ore ...

2021-8-10  Abstract Ammonium carbonate is used as leaching agent. The low grade African copper oxide ore is leached in ammonium carbonate solution decomposing to ammonia during heated. The effects of particle size of copper ore, concentration of ammonium carbonate, solid-to-liquid ratio, leaching temperature, leaching time and stirring rate on leaching ...

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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 ...

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Comparison of various extractants for recovery of Copper ...

Solvent extraction of copper from the copper leach solution obtained from the ammoniacal carbonate leaching of the Sarcheshmeh copper concentrate was carried out, and the performance of CP-150, LIX984N, and Kelex100 as well as the effects of different parameters involved were investigated. According to the results obtained, the extraction kinetics of all the three extractants was fast.

More

Kinetics of copper dissolution - CORE

2020-2-6  ammonia, ammonium carbonate, and copper ammonium carbonate (37). Perhaps, leaching copper oxide ores treated with a preliminary reducing roast is economically feasible. Although leaching copper with ammonia is commercially applied, the nature of the reaction is not well understood. Several contradictions exist in the results of earlier investi ...

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Ammoniacal Percolation Leaching of Copper Ores:

2013-7-18  Abstract. The general feasibility of ammoniacal percolation leaching of copper sulphide ores has been demonstrated. The rates are comparable to those of conventional ferric sulphate-sulphuric acid systems, but without the attendant problems of carbonate or iron dissolution, For the ore column heights studied, the copper leaching rate increased approximately as the square root of the total NH 3 ...

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The leaching and adsorption behaviour of gold ores

2020-8-28  4.3 CYANIDE LEACHING OF THE COPPER CONCENTRATE 92 4.3.1 The effect of copper 101 4.3.2 The role of iron 106 4.3.3 The role or nickel 107 4.3 .4 The role of silver 109 4.3.5 Theroleofzinc 109 4.4 THE EFFECT OF COPPER CYANIDE ON GOLD LEACHING FROM OXIDE AND SULPHIDE ORES 110 4.5 SUMMARY 114 CHAPTERS PREG-ROBBING PHENOMENA IN THE

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Ammonium Sulfite in Copper Hydrometallurgy

2019-9-15  4 Fig. 1 Leaching of raw and reduced ore with ammonium sulfite. Fig. 2 pH change on treating ammoniacal ammonium carbonate solution by SO2 When SO2 is bubbled further, the solution turns yellow, the pH will gradually decrease until at pH 5 then rapidly to pH 3.

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The leaching of metal sulfides in ammoniacal carbonate ...

2018-4-4  The rate of copper leaching shows that the surface reaction model applies best to this system. The activation energy was 11.5 kJ/mol at 25 °C and 57.6 kJ/mol at 60 °C. The reaction order with respect to ammonia was 1.9 and for ammonium carbonate it was 4.0. The leaching kinetic data for cobalt from monometallic cobalt sulfide, showed that the

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The Effect of Leaching Time and Ammonia Concentration

ammonium carbonate being 0.3 M for the system, with a leaching time of 120 minutes giving them over 98% of copper recovery. Highest recovery for ammonia alone was 53% with only 5% of copper being recovered when using ammonium carbonate. The increase in recovery of

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Ammonia/nitric Acid Leaching of Copper- Cobalt

2015-3-4  dissolution kinetics of malachite in ammonia- ammonium carbonate solution at room temperature, and reached an optimum recovery of 98% copper. While a number of articles, graphical or numerical results have been presented showing the efficiency to recover almost all the copper present in the raw material by ammonia leaching or ammonia + ammonium

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

reported that ammonium carbonate is advantageous over other species due to its relative low toxicity and stability of free NH3 and the resulting metal ammine complex by carbonate (Jha et al., 2001; Zapp et al., 2012). Copper leaching of metals from solid matrices by ammonium carbonate is well documented.

More

The leaching of metal sulfides in ammoniacal carbonate ...

2018-4-4  The rate of copper leaching shows that the surface reaction model applies best to this system. The activation energy was 11.5 kJ/mol at 25 °C and 57.6 kJ/mol at 60 °C. The reaction order with respect to ammonia was 1.9 and for ammonium carbonate it was 4.0. The leaching kinetic data for cobalt from monometallic cobalt sulfide, showed that the

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The leaching of metal sulfides in ammoniacal carbonate ...

The available data is possibly not very reliable, however. The rate of copper leaching shows that the surface reaction model applies best to this system. The activation energy was 11.5 kJ/mol at 25 °C and 57.6 kJ/mol at 60 °C. The reaction order with respect to ammonia was 1.9 and for ammonium carbonate it

More

Comparison of various extractants for recovery of Copper ...

Solvent extraction of copper from the copper leach solution obtained from the ammoniacal carbonate leaching of the Sarcheshmeh copper concentrate was carried out, and the performance of CP-150, LIX984N, and Kelex100 as well as the effects of different parameters involved were investigated. According to the results obtained, the extraction kinetics of all the three extractants was fast.

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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 -

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Extraction of Zinc from Smithsonite by Ammonia Leaching

2020-1-8  concentration on Zn extraction with respect to leaching duration. This study is progressing with different ammonia salts such as ammonium chloride (NH 4 Cl) or ammonium carbonate ((NH 4) 2 CO 3) to more comprehensively understand the leachability of smithsonite and to investigate the effect of different reagents on Zn extraction. 4. Conclusions

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The leaching and adsorption behaviour of gold ores

2020-8-28  4.3 CYANIDE LEACHING OF THE COPPER CONCENTRATE 92 4.3.1 The effect of copper 101 4.3.2 The role of iron 106 4.3.3 The role or nickel 107 4.3 .4 The role of silver 109 4.3.5 Theroleofzinc 109 4.4 THE EFFECT OF COPPER CYANIDE ON GOLD LEACHING FROM OXIDE AND SULPHIDE ORES 110 4.5 SUMMARY 114 CHAPTERS PREG-ROBBING PHENOMENA IN THE

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Copper carbonate with ammonia water (two step equation ...

2017-5-31  Copper carbonate with ammonia water (two step equation), balanced with state symbols was asked on May 31 2017. View the answer now.

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Validation and Implementation of Cold Purification Cake ...

The leaching solution is a mixture of ammonium carbonate and ammonium hydroxide and it is preferably carried out in the presence of an oxidizing gas, for example air or oxygen to oxidize cuprous ions into cupric ions. Further, depending on the potential pH diagram of Cu-NH 3-H2O system, metallic copper can be easily oxidized in an ammonical ...

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Studying on Leaching Low Grade Copper Oxide Ore in the ...

Leaching test on the Oxidized Copper Ore coming from Dishui, XinJiang Province is studied in the NH4CO3-H2O system;Systematic studies are made to show the effects of various factors on the leaching rate of copper. The optimum conditions for leaching is finally confirmed, namely the grinding size is 85% of -0.074mm, concentration of Ammonium carbonate 2mol/L, temperature 45°C, solid to ...

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