Selective leaching of copper and zinc from primary ores and …

Copper leaching of metals from solid matrices by ammonium carbonate is well documented. However, little is known about metal extraction with biogenic ammonia, with just two studies to date implicating the role of microbially produced ammonia from a low grade Cu ore ( Wang et al., 2013 ; Hu et al., 2016 ).

Leaching kinetics of low-grade copper ore containing

Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate. Author links open overlay panel Zhi-xiong LIU a b, Zhou-lan YIN a, Hui ... Characterization and kinetic study on ammonia leaching of complex copper ore. Transactions of Nonferrous Metals …

AMMONIA LEACHING IN THE COPPER INDUSTRY: A …

AMMONIA LEACHING IN THE COPPER INDUSTRY: A REVIEW . V Radmehr. 1, S M J Koleini. 2, *, M R Khalesi. 3. and M R Tavakoli ... carbonate leaching ammonia/ ammonium (Bingol carbonate leaching

Improved cupric ammonium carbonate leaching of copper …

Improved cupric ammonium carbonate leaching of copper scrap. by W. Lyman Staker, C.J. Chindgren and K.C. Dean by, U.S. Dept. of the Interior edition, in English

(PDF) Ammoniacal leaching and recovery of copper from …

Obtained result showed that the most favorable conditions for the alloy dissolution can be achieved in the ammonia–ammonium carbonate system. It allows leaching copper effectively, without uncontrolled alloy degradation (as in the chloride bath) and recovering the metal at the lowest electrolysis voltage (3.5 V), highest current efficiency ...

Ammonia leaching process for selective extraction of nickel …

Ammonia leaching primarily relies on the complexation of NH 3 with Ni 2+ and Co 2+ to generate stable ammonia complexes Ni(NH 3) 6 2+ and Co(NH 3) 6 3+ ... Cobalt recovery from mixed Co–Mn hydroxide precipitates by ammonia–ammonium carbonate leaching. Min. ENG, 23 (2010), pp. 643-651, 10.1063/1.5038312. View PDF …

Complex electronic waste treatment – An effective process to

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).

Ammonia Leaching: A New Approach of Copper …

Ammonia– ammonium carbonate leaching Leaching time, ammonium hydroxide, and ammonium carbonate concentration, pH, stirring speed, solid/ liquid ratio, particle size and temperature 98 [8] A study on the oxidative ammonia– ammonium sulphate leaching of a complex (Cu–Ni–Co–Fe) matte Ammonia– ammonium sulphate – 93.8 [9] Ammonia ...

Ammonium-carbonate leaching of metal values from water …

With two-stage leaching at 50C in concentrated ammonium carbonate, the copper-plus-nickel content can be reduced to a level of less than 1 percent from an original content on the order of 10 percent. By roasting the depleted sludge with soda ash, at least 80 percent of the chromium can be recovered in water-soluble form.

Frontiers | Copper Recovery From Ammonia Solutions …

In summary, it was possible to develop a novel process for the electrochemical deposition of copper from an ammoniacal copper catholyte using …

Improved Cupric Ammonium: Carbonate Leaching of Copper …

Improved Cupric Ammonium: Carbonate Leaching of Copper Scrap. PB204131. Alternatives were developed to the conventional ammoniacal carbonate leaching …

Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching

Leaching kinetics of malachite in ammonium carbonate solutions. P. D. Oudenne F. A. Olson. Materials Science, Chemistry. 1983. Leaching of malachite was conducted with ammonium carbonate as lixiviant and with temperature, lixiviant concentration, and particle size as variables. Two stages of reaction were found.

The hydrometallurgical extraction of zinc by ammonium carbonate…

For a concentration of 0.1 mol/L of ammonium in the leaching solution, zinc basic carbonate, was obtained, while for higher ammonium concentrations (0.5 and 1 mol/L), zinc ammonium carbonate was ...

Ammonia leaching in the copper industry: a …

PDF | On Jan 1, 2012, Mohammad Reza Tavakoli Mohammadi published Ammonia leaching in the copper industry: a review | Find, read and cite all the research you need on ResearchGate.

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 …

The effect of leaching time and ammonia concentration on …

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 slow drop in the pH of the buffer solution, at +/-0.5, resulting in the formation of stable copper-ammonia complexes [9].

Metal Recovery From Secondary Copper Converter …

The following reagents were used in studying the leaching of flue dust with an (NH4)2C03-NH40H system: reagent-grade (NH4)2C03, technical-grade NH40H (27 wt pct NH3), and 30-mesh granular Zn. A sample of flue dust was obtained from a major secondary copper smelter. Converter flue dust from this smelter is recovered by two collectors in series.

Ammonia Leaching: A New Approach of Copper …

to recover copper due to high solubility in ammonia, later on ammonia leaching of sulfide ores was also considered. The common method was the use of oxide roasting at high

Comparison of various extractants for recovery of …

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, ... have reviewed the applications of ammonia leaching in copper industry, and reported the advantages and disadvantages of this method [6].

Ammoniacal leaching and recovery of copper from alloyed …

Obtained result showed that the most favorable conditions for the alloy dissolution can be achieved in the ammonia–ammonium carbonate system. It allows …

Asia-Pacific Journal of Chemical Engineering

Iron was removed from the leaching solution with the addition of ammonia. Afterward, manganese carbonate products were prepared from iron-free manganese sulfate solution by adding ammonium carbonate at a stirring duration of 60 min, a reaction temperature of 40°C, a pH of 7, and a molar ratio of ammonium carbonate to the …

Ammonia Leaching: A New Approach of Copper …

The dissolution of copper and nickel in ammonium carbonate solution was studied by techniques involving electrochemical anodic dissolution and ring-disc electrodes.

Leaching Kinetics of Malachite in Ammonium …

to 10.8. The pH was buffered at 8.8 by the ammonium carbonate. Habashi and Dugdale m have shown for chryso- colla, an oxide ore of copper of somewhat similar behavior, that variation of pH from 8.5 to 12 had little effect on copper recovery leaching with ammonium carbonate. Consequently,

How to Leach Copper Scrap

The best proportion of ammonia to carbon dioxide for rapid dissolution of metallic copper is 4 moles of ammonia to 1 mole of carbon dioxide. Thus, 68 grams NH3 and 44 grams CO2 will dissolve up to 1 mole of copper. Use of still larger quantities of ammonia and carbon dioxide does not materially influence the rate of dissolving …

A study of recovery of copper and cobalt from copper…

It was found that using ammonium chloride to roast ore and leaching of the calcined slag by hot water, the precipitation of copper and cobalt from the leaching solution by adjusting pH with ammonia led to a copper and cobalt recovery of 90% and 95%, respectively (Shi et al., 1997, Xiao et al., 2010). By absorbing the exhaust gas, the …

Recovery of Copper from Ammoniacal Leachates by Ion Flotation

For this reason, ammonium carbonate ((NH 4) 2 CO 3) was selected as ammonium salt for the leaching of the microwave-roasted material in combination with aqueous ammonia. The effect of total {ammonia + ammonium} concentration ([NH 3 + NH 4 +]), leaching temperature, and leaching time on the leaching efficiencies of copper …

[PDF] Leaching kinetics of low-grade copper ore containing …

DOI: 10.1016/S1003-6326(11)61538-0 Corpus ID: 73719281; Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate

Copper Recovery From Ammonia Solutions Through Electro …

Alkaline leaching with highly selective ammoniacal complexing agents is an interesting alternative for the treatment of copper concentrates. This treatment is beneficial for copper recovery because it allows the formation of soluble amines complexes, with cupric tetramine ( Cu (NH 3) 4 2 +) being the most stable.In order to suppress the unit …

Leaching kinetics of low-grade copper ore containing

Request PDF | Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate | The leaching kinetics of copper from low-grade ...

(PDF) Leaching of malachite ore in ammonium …

Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide 165 Brazilian Journal of Chemical Engineering Vol. 32, No. 01, pp. 155 - 165, J anuary - March, 2015 Han, …