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Leaching kinetics of copper flotation tailings in aqueous ammonia …

Optimum leaching conditions from malachite ore by ammonia/ammonium carbonate solution are found as ammonia/ammonium carbonate concentrations: 5 M NH4OH+0.3 M (NH4)2CO3; solid/liquid ratio: 1:10 g ...

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Ammonia Leaching: A New Approach of Copper …

Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low …

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2022/sbm copper leaching ammonium carbonate.md at …

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Ammonia Leaching: A New Approach of Copper …

After an initial reduction step with at 600°C, leaching at room temperature and atmospheric pressure with aqueous ammonia-ammonium carbonate and ammonia-ammonium sulfate solutions yielded high ...

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Dissolution Kinetics of Malachite in Ammonia/Ammonium Carbonate Leaching

Optimum leaching conditions from malachite ore by ammonia/ammonium carbonate solution are found as ammonia/ammonium carbonate concentrations: 5 M NH4OH+0.3 M (NH4)2CO3; solid/liquid ratio: 1:10 g ...

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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 LIU Zhi-xiong1, 2, YIN Zhou-lan 1, HU Hui-ping1, CHEN Qi-yuan1 1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2. College of Chemistry and Chemical …

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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 ...

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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 ...

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Leaching kinetics of low-grade copper ore containing …

The leaching kinetics of copper from low-grade copper ore was investigated in ammonia-ammonium sulfate solution with sodium persulfate. The effect parameters of stirring speed, temperature, particle size, concentrations of ammonia, ammonium sulfate and sodium persulfate were determined.

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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 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 …

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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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Recovery of copper from ammoniacal/ammonium carbonate …

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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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 …

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Dissolution kinetics of low grade complex copper ore in ammonia …

BINGÖLA D, CANBAZO LUB M, AYDO AN S. Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching [J]. Hydrometallurgy, 2005, 76(1/2): 55 62. [13] CHENG Qiong, ZHANG Wen-bin. Technical process in ammonia leaching of Tang-dan oxidized copper ore containing alkaline gangues [J]. Yunnan …

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Ammoniacal Solvoleaching of Copper from High-Grade Chrysocolla …

The copper silicate ore chrysocolla forms a large potential copper resource, which has not yet been fully exploited, due to difficulties associated with its beneficiation by flotation and metallurgical processing. Direct acid leaching of chrysocolla causes silica gel formation. Therefore, in this work, the feasibility of solvometallurgical methods to leach …

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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).

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Improved Cupric Ammonium: Carbonate Leaching of Copper …

Alternatives were developed to the conventional ammoniacal carbonate leaching-steam stripping procedure for recovering copper as an oxide from contaminated scrap metal. By entraining air bubbles in the leach solution, the copper dissolution rate was increased to 1.5 g/sq in. of copper surface per hour, compared to 0.5 g/sq in/hr produced by ...

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Frontiers | Copper Recovery From Ammonia …

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 …

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Recovery of copper from alkaline glycine leach solution …

LIX 64N an oxime extractant) studied for the extraction of copper and nickel from an ammoniacal-ammonium carbonate solution has been noted to transfer ammonia; requiring a scrubbing step to remove of the picked up ammonia [25]. ... The results also confirm the selectivity of leaching copper with alkaline glycine solutions [29].

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THE HYDROMETALLURGICAL EXTRACTION OF ZINC BY AMMONIUM CARBONATE…

The use of ammonium carbonate for the extraction of metals such as copper and nickel is well known. Less well known is the fact that ammonium carbonate extraction was used for the commercial recovery of zinc decades before its application to either copper or nickel. ... The liberated zinc oxide was then recovered by ammonium …

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Selective copper recovery from complex mixtures of end-of …

By using air as the oxidant and ammonia–ammonium carbonate leaching solution, copper could be extracted with high recovery – more than 90%, and high extraction selectivity – around 98%. In order to understand the copper extraction process and the reaction mechanisms, the effects of a range of parameters during copper …

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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 …

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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.

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Leaching of chrysocolla with Ammonia-Ammonium carbonate solutions

Chrysocolla was leached in solutions of ammonium hydroxide and ammonium carbonate as a function of the variables: temperature (25 to 55 ‡C), ammonia-ammonium ratio (0.0:1.0 to 1.0:0.0), total ammonia concentration (0.25 to 6.0 M), and particle size (100 to 400 mesh). A model of the leaching behavior was deduced based on: (1) the activation …

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Acidic and Ammonium Sulphate Leaching of Historic Copper …

Ammonium Sulphate Leaching. Ammonia medium used for leaching was prepared by adding 66 g of ammonium sulphate to 3.5 mL ammonium solution and 200 mL of distilled water. Half of the prepared ammonia solution was used to leach 40 g of the copper tailings sample. The pH during the entire leaching process was 8.3.

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Dissolution study of chalcopyrite concentrate in oxidative ammonia

The thermodynamics and kinetics of reaction systems involving ammonia–copper, ammonia–nickel and ammonia–cobalt have been investigated in detail (Williams and Light, 1978, Vu ... Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching. Hydrometallurgy, 76 (2005), pp. 55-62. View PDF View article …

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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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Dissolution kinetics of malachite in ammonia/ammonium …

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 …