Use of Ammonia Salts in Selective Copper Extraction from Tailings
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.
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Investigation of Copper Ammonia Leaching from Smelter …
Leaching Experiments. The batch leaching tests of prepared slag samples (as mentioned previously) with a combination of ammonia (25 pct ammonia solution) and ammonium carbonate were performed in a 2 L glass reactor fitted with a mechanical stirrer, a thermometer, a reflux condenser, and a gas sparger.
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Use of Ammonia Salts in Selective Copper Extraction …
The leaching solutions that were used in the experiments contained ammonium persulfate, ammonium hydroxide, am-monium carbonate, ammonium nitrate, and ammonium chlo-ride, including derivatives of ammonium. The quantities requiredof ammoniumpersulfate, ammoniumcarbonate,am-monium nitrate, and ammonium chloride were weighed care-
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Ammoniacal leaching and recovery of copper from alloyed …
The high-copper alloy can dissolve spontaneously in ammoniacal solutions with added copper(II) ions. The leaching in chloride, carbonate and sulfate baths allowed a distinct …
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Novel treatment for mixed copper ores: Leaching ammonia
The procedure involves three stages: (i) leaching with aqueous ammonia solutions at room temperature and varied pH, ammonia concentration, solid concentration, and particle size; (ii) PLS precipitation in copper sulfides by the addition of sulfur (or other copper sulfates) and SO 2 (or additional sulfites or bisulfites); (iii) froth flotation ...
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Chemistry of the Ammonia Pressure Process for …
ate was leached by percolation with an ammonia ammonium carbonate solution to dissolve the copper as the ammine. At Calumet and Hecla 6 -9 with a mill tailing containing about 0.4 pct Cu as metallic cop per, it has been found necessary to aerate the ammo nia-ammonium carbonate leach solutions between
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Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching
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
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Ammonia leaching in the copper industry: a …
The current study investigated a hybrid approach using aqueous ammonia as a pH modifier for glycine-based lixiviant systems to leach copper from chalcopyrite while maintaining surface...
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An investigation into the leaching behaviour of copper …
Leaching of malachite ore in aqueous ammonia/ammonium carbonate at 25 °C, solid to liquid ratio of 1:10, stirring speed of 300 rpm, particle size < 450 μm, has been found to recover up to 98% of the copper in 120 min, while the gangue minerals did not dissolve in the solution (Bingöl et al., 2005).
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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 and zinc is shown in ...
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(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 ...
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Investigation of Leaching Kinetics of Copper from …
can be obtained for the electrolytic recovery of copper. The leaching and kinetics of malachite, which is an oxidized copper ore, in ammonia-containing solutions has been investigated by various researchers. Oudenne and Olson[10] studied the leaching kinetics of malachite in ammonium carbonate solutions. They reported that
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Optimal conditions for ammonia leaching of …
2013). Ammonia leaching is also selective in that it will not dissolve all available nonspecific metals, such as iron and manganese, along with the copper or cobalt, as sulphuric acid does. Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching (Park et al., 2006). The ammonia leaching process is more environment
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The aqueous chemistry of the copper-ammonia system and …
The dissolution of copper during the leaching of chalcopyrite in ammonia solutions is an attractive alternative to acid sulfate leaching in the treatment of ores with high consumption of acid. Despite considerable research into this complex leaching system, a lack of understanding of the fundamental chemical drivers has delayed the ...
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The Effect of Leaching Time and Ammonia …
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 …
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Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching
Semantic Scholar extracted view of "Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching" by D. Bingöl et al. ... ABSTRACT This study investigated the kinetics of copper leaching from malachite ore using formic acid as an organic leaching reagent. The analysis was carried out to determine the effect of the …
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Dissolution kinetics of malachite in ammonia/ammonium …
More than 98% of copper was effectively recovered. During the leaching, copper dissolves as in the form of Cu(NH 3) 4 +2 complex ion, whereas gangue minerals do not react …
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Recovery of Copper from Ammoniacal Leachates by Ion …
Ion flotation is a separation technique capable of recovering metal ions from dilute aqueous leachates. In this paper, ion flotation was applied to separate copper from …
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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
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The hydrometallurgical extraction of zinc by ammonium carbonate…
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 ...
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Hydrometallurgical recovery of copper from complex …
A few studies are reported with ammonia leaching of solid waste: Abdel Basir and Rabah (1999) used ammonia leaching of copper from the brass melting slag; Koyama et al. (2006) investigated copper leaching of PCB with Cu ... Ammonia–ammonium salt leaching. Both ammonium carbonate and ammonium sulphate were added to (NH 4)OH for ammonia leaching.
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Behavior of Copper Dissolution in an Ammonia Solution …
In order to investigate a leaching behavior of copper, copper plates were immersed and stirred in a solution of 7 kmol m-3 NH 3 and 1 kmol m-3 (NH4)2SO4 containing 0.5 kmol m-3 Cu(II) at …
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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 …
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Ammoniacal System Mechanisms for Leaching Copper from …
Although different copper compounds have already been tested with this leaching alternative in different ammonia media such as malachite in ammonia/ammonium carbonate system, oxidized copper ore in ammonium chloride solution, complex copper in ammonia-ammonium chloride solution, malachite ore in ammonium nitrate solutions, tenorite and ...
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Leaching kinetics of low-grade copper ore containing …
Trans. Nonferrous Met. Soc. China 22(2012) 2822âˆ'2830 Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate LIU Zhi-xiong 1, 2, YIN Zhou-lan 1, HU Hui-ping 1, CHEN Qi-yuan 1 1.
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LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE …
In ammonia leaching of oxidized copper ores, as the dissolution reactions happen at mildly acidic or basic conditions, some metal impurities, which pass into the solution during the dissolution of ore, precipitate because of the high pH of the solution. ... Aydoğan, S., Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching ...
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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). Moreover, no studies to date have ...
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Behavior of Copper Dissolution in an Ammonia …
an ammonia solution containing ammonium carbonate, and reported that the leaching speed increased with increasing Cu(II) concentration, O2 gas flow rate and bath ... for leaching copper, copper plates were immersed and stirred at 300 rpm in solutions of 1~6 kmol m-3 NH 3 and 1 kmol m-3 NH 4 4 4 4Cl 4 4 4)2)2SO) ) )2 V) 0 50 100
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US4165264A
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 liquor is treated with a …
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The aqueous chemistry of the copper-ammonia system and …
The dissolution of copper during the leaching of chalcopyrite in ammonia solutions is an attractive alternative to acid sulfate leaching in the treatment of ores with high consumption of acid.
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