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8/21/1979· 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 …
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Ammonia leaching is generally carried out at a lower temperature, reducing heat consumption. In this paper, firstly, the possibility of selective extraction of nickel and cobalt …
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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, …
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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. …
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showed less effects on LIX984N and Kelex100. A desirable stripping of copper from the loaded organic phase could be obtained using H 2 SO 4 solution. Keywords: Copper, Ammoniacal …
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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 …
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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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A program of bench and pilot plant testing was conducted to demonstrate the reductive leaching of ground nodules in a seawater-based ammonia–ammonium carbonate leach solution. The …
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A-Z of Copper Ore Leaching 45 1. Designed 5.1% Cu ore to produce 60,000 tpa copper cathodes with a recovery of 90% . 2. The copper mineralogy is predominantly chalcocite contained …
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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. …
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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 …
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Ammonium carbonate achieves a copper leaching rate of 63.5%. Ammonium chloride achieves a rate of 70.0%. Ammonium sulfate achieves a rate of 68.9%. Ammonium chloride and …
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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: …
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Treatment of the raw, dried sludge used in this experimental program by ammonium carbonate leaching to remove copper and nickel appears to have reduced the susceptibility of the treated …
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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 …
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At Calumet and Hecla 6-9 with a mill tailing containing about 0.4 pct Cu as metallic copper, it has been found necessary to aerate the ammonia-ammonium carbonate leach solutions between …
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Trans. Nonferrous Met. Soc. China 22(2012) 2822âˆ'2830 Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate …
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Although different copper compounds have already been tested with this leaching alternative in different ammonia media such as malachite in ammonia/ammonium carbonate …
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This paper describes a highly alkaline low-grade copper oxide ore. Copper can be selectively leached out while other metals are retained. A thermodynamic model of the CuO …
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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 …
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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 …
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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 …
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The use of ammonia as a leaching agent in the recovery of copper from ores and concentrates has a number of potential benefits. These include the ability to treat ores with an …
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Benedict described the ammonium carbonate leach process used to dissolve and recover metallic copper from Michigan conglomerate-ore mill tailings. Coles, Damon, and …
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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 …
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Ammonia salts have proven efficient in leaching copper from various sources, including e-waste, and have been reported in the literature []mon ammonium salts …
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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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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 …
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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 …
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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.
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