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copper leaching ammonium carbonate

Ammonium Carbonate Leaching Of Metal Values From Water ...

LEACHING OF METALS AFTER TREATMENT OF SLUDGE TO REMOVE COPPER AND NICKEL Residues from the two-stage, ammonium-carbonate leaching Experiments 35A and 35B, and for dried sludge, were analyzed as follows: Residue Residue Dried, Unleached 35B 36B Sludge Copper, percent 1.6 1.3 5.9 Nickel, percent 0.59 0..70 1.3 Chromium, percent 13.2 13.0 12.3 32

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

Jun 03, 2020 · 高达10%返现 · The results of the leaching process with ammonium carbonate are shown in Fig. 4. As seen in the figure, ammonium carbonate leaching was studied in the concentration range of 10–250 g/L at five different temperatures. The effects of (NH 4) 2 CO 3 concentration were highly noticeable, especially at high temperatures.

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

Dec 10, 2013 · 高达10%返现 · In another study on malachite leaching in ammonium carbonate solution, it was established that there are two steps for the dissolution reaction. Firstly, the malachite was rapidly dissolved, but after completion of 10 % of reaction, leaching rate was reduced with the formation of needle-structured middle phase causing surface blockage.

Leaching kinetics of copper flotation tailings in aqueous ...

Apr 01, 2013 · 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 ...

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

The results of experiments on the pressure leaching of the initial copper concentrate in an ammonium/ammonium-carbonate solution with oxygen as an oxidizing agent are

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

Jun 03, 2020 · The results of the leaching process with ammonium carbonate are shown in Fig. 4. As seen in the figure, ammonium carbonate leaching was studied in the concentration range of 10–250 g/L at five different temperatures. The effects of (NH 4) 2 CO 3 concentration were highly noticeable, especially at high temperatures.

CA1153984A - Ammonia leaching - Google Patents

AMMONIA LEACHING Abstract-of the Disclosure 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 ...

Comparison of various extractants for recovery of Copper ...

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

Complex electronic waste treatment - An effective process ...

The copper recovery rate could reach 95% with ammonium carbonate as the leaching salt. In the stage of copper recovery from the solution, electrodeposition was introduced without an additional solvent extraction step and the electrochemical behaviour of the solution was figured out.

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

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 ...

Kinetics of copper dissolution - lib.dr.iastate.edu

On a commercial scale the leaching of native copper ores by a solution of ammonia and ammonium carbonate is possible as in the case of Calumet and Hecla Mining Co. (3). Universal Mineral and Metals, Inc. leaches scrap copper by a solution of ammonia, ammonium carbonate, and copper ammonium carbonate

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

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 copper from the malachite was also due to the

Complex electronic waste treatment – An effective process ...

Nov 01, 2016 · As given in Fig. 1, ammonium chloride shows the lowest copper leaching rate while copper is more favourable to be leached when ammonium carbonate is used than other ammonium salts (Temperature: 18 °C, ammonia content 7.8 wt.%, solid to liquid ratio 1/5, stirring rate 600 rpm and air flow rate 50 L/h).

(PDF) Advances in Mineral Processing and Hydrometallurgy ...

The results of experiments on the pressure leaching of the initial copper concentrate in an ammonium/ammonium carbonate solution with oxygen as an oxidizing agent are in good agreement with the shrinking core model in the intra-diffusion mode: in this case, the activation energies were 53.50 kJ/mol for Cu and 90.35 kJ/mol for Ag.

Leaching kinetics of copper flotation tailings in aqueous ...

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 ...

Dissolution kinetics of malachite in ammonia/ammonium ...

Abstract 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, [NH3]/[NH4+] ratio, stirring speed, solid/liquid ratio, particle size, and temperature were investigated.

The leaching of metal sulfides in ammoniacal carbonate ...

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

COPPER(II) EXTRACTION FROM AMMONIA LEACH SOLUTION

Keywords: hydrometallurgy, hydroxyoximes, LIX, copper ore, copper concentrate Introduction Ammonia leaching is frequently used in hydrometallurgy for processing of oxide and sulfide ores, concentrates or by-products, particularly those containing significant amounts of carbonate rocks, which during the acidic leaching contribute to increased

Metal Recovery From Secondary Copper Converter Dust by ...

leaching, cementation, precipitation, and roasting. Flue dust was leached at room temperature with an alkaline solution of (NH4)2C03 and NHpH to solubilize ZnO and Zn metal. Some copper, lead, tin, and most of the zinc were dissolved in the leach step. Copper, lead, and tin were recovered in the cement product. The Zn in the flltrate was

NIOSHTIC-2 Publications Search - 10010780 - Leaching ...

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

Copper Recovery From Ammonia Solutions Through Electro ...

Jan 28, 2021 · Within the alternatives to the treatment of sulfured copper concentrates are basic or alkaline leaching with highly selective ammoniacal complexing agents for benefit of Copper. Thus, leaching with aqueous dissolutions containing ammonium ions being supplied to the system as ammonium hydroxide, ammonium chloride, and/or ammonium carbonate ...

Frontiers | Copper Recovery From Ammonia Solutions Through ...

Jan 28, 2021 · Within the alternatives to the treatment of sulfured copper concentrates are basic or alkaline leaching with highly selective ammoniacal complexing agents for benefit of Copper. Thus, leaching with aqueous dissolutions containing ammonium ions being supplied to the system as ammonium hydroxide, ammonium chloride, and/or ammonium carbonate ...

Leaching kinetics of copper flotation tailings in aqueous ...

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

COPPER(II) EXTRACTION FROM AMMONIA LEACH SOLUTION

Keywords: hydrometallurgy, hydroxyoximes, LIX, copper ore, copper concentrate Introduction Ammonia leaching is frequently used in hydrometallurgy for processing of oxide and sulfide ores, concentrates or by-products, particularly those containing significant amounts of carbonate rocks, which during the acidic leaching contribute to increased

(PDF) Advances in Mineral Processing and Hydrometallurgy ...

The results of experiments on the pressure leaching of the initial copper concentrate in an ammonium/ammonium carbonate solution with oxygen as an oxidizing agent are in good agreement with the shrinking core model in the intra-diffusion mode: in this case, the activation energies were 53.50 kJ/mol for Cu and 90.35 kJ/mol for Ag.

PROCESS FOR PRODUCING COPPER OXIDE - GENERAL

The leaching operation can be carried out in a leach tank by flowing the cupric ammonium carbonate complex leach solution through the copper-bearing material placed therein. The solution can be circulated repeatedly through the tank by means of connecting pipes and a pump to increase the cuprous ammonium carbonate complex content of the ...

Management of a copper smelter dust for copper profitability

Probably, ammonium carbonate fulfils most if not all of the above requirements. The results derived from leaching experiments, using ammonium carbonate solutions and various experimental variables, on the copper flue dust are summarized in Table 2. From this series of experiments it can be deduced that under the various experimental

MANAGEMENT OF A COPPER SMELTER DUST FOR COPPER

Higher copper concentrations can be yield in the solutions after leaching with ammonium carbonate solutions. NH. 4 + NH. 3 + H + Cu(NH. 3) n 2+ n= 2 or 4. Despite the generation of ammonia, the pH of the solution does not vary appreciably since most of the generated ammonia is complexed by copper (II), while the uncomplexed ammonia and the ...

Copper-Ammonia Complex | Chemdemos

Discussion. The copper ion in the aqueous solution of exists predominantly as [Cu (H 2 O) 6] 2+. This complex ion imparts a characteristic pale blue color to the solution. Since ammonia is a weak base, when it is added, hydroxide ion forms: NH 3 ( aq) + H 2 O ( l) NH 4+ ( aq) + OH - ( aq ); pK b = 9.25 (1) The hydroxide ion reacts with the ...

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

Aug 25, 2020 · The obtained results indicate the possibility of receiving quite high copper leaching efficiency from slag with a relatively low yield for lead extraction. The use of ammonium acetate solutions with a concentration of 5 mol/dm 3 leads to leaching from the slag over 80% of the copper contained in it after 90 min of the process carried out at a ...

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.

Ammoniacal Percolation Leaching of Copper Ores: Canadian ...

Jul 18, 2013 · 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 concentration, but was independent both of the ratio of ammonium ...

(PDF) Investigation of Leaching Kinetics of Copper from ...

The ammonium ion provides the protons (hydronium The effect of particle size on the leaching of copper ion) required for the dissolution of basic malachite ore, from the malachite ore was examined by using fractions whereas the ammonia produced forms stable complexes of the ore with average particle size of 136, 120, 93, 71.5, with copper (II ...