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In considering the applicability of ammonia leach methods for treating material of this composition, ... Fig. 1-Flow diagram of leaching and copper-removal circuits. 458-JOURNAL OF METALS, MARCH 1955 ~ SOLUTION Fig. 2-Diagrammatic representation of leaching sulphide ...
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Fig. 1—Flow diagram of leaching and copper-removal circuits. Laboratory and plant studies showed that these requirements could be met by mixing the sulphide concentrate with strong aqueous ammonia solution and leaching at a temperature between 160° and 190°F with vigorous agitation in a closed vessel with compressed air to provide a partial pressure of oxy- gen of …
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A novel and efficient ammonia leaching method for recycling waste LIBs is proposed in this study. The leaching system selected in this study is composed of NH 3 ·H 2 O–NH 4 HCO 3 and Na 2 SO 3.This is because, on the one hand, NH 4 HCO 3 forms a relatively stable buffer system with NH 3 ·H 2 O, providing a suitable condition for leaching. At the same time, the …
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The possibility of using ammonium salts in heap leaching is also discussed, and the results of some small-scale column leach tests presented. Possible methods for recovering the copper from the leach solution are outlined, and the types of ores and concentrates for which ammonia leaching may prove to be a viable alternative processing route are ...
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Glycine solutions in an alkaline environment have been shown to be able to leach copper from its oxide, native and sulfide minerals as a copper glycinate complex. ... oxidative leaching methods and application of Fe(III) ions and oxygen or bacteria assisted environment. ... the limited stability region of ammonia solutions and copper-ammonia ...
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However, solvent extraction is one of the most viable routes to extract copper from pregnant leach solution (PLS) among other methods such as precipitation, coagulation, flocculation, flotation, ion exchange, electro-oxidation, membrane filtration, and biosorption [1,2,3,4,5]. It is the most sorted and valuable route due to its distinct ...
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Copper is one of the most important valuable elements in waste printed circuit boards (WPCBs), which can be finally recovered by hydrometallurgy.Environmentally-friendly copper leaching technology has become critical. In this study, two environmentally friendly leaching systems, namely ammonia-ammonium chloride leaching system and glycine …
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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 …
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Low-grade copper oxide ore containing high silicon, composed of mainly of chrysocolla, quartz, muscovite, dolomite, kaolinite, and Na-feldspar, is a promising source for recovery, which processing by existing methods are not economical. An alkali-dissolving desilication method, followed by ammonia leaching for extraction of copper from low-grade …
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The scheme of combined leaching method with ammonia and alkaline bacteria is shown in Table 4. ... Key parameters of bioleaching with alkaline bacteria from copper sulfide tailings 3.2 Ammonia leaching from copper sulfide tailings A 30-days ammonia leaching experiments of sulfide tailings with different concentration of ammonia was carried out ...
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Advantage Ammonia leaching has many advantages over acidic leaching. The main advantages are as follows: a. Marked difference of the two methods.
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This paper highlights the use of ammoniacal leaching for successful extraction of metals like nickel, cobalt, copper, zinc, vanadium, and molybdenum from diverse sources such …
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In this paper, an attempt was made to describe the basis and different ammonia leaching methods and present the major research activities in this field for copper. Also latest findings and related novel processes have been presented.
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The ammoniacal leaching has been considered very selective for copper compared with other leaching systems; however, there are interactions with zinc and nickel that also form stable ammonia ...
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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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Metals like copper, or non-metals, like arsenic, can be soluble substances. A solvent, such as water, acid, or air, is passed through the solid matrix to achieve leaching. The soluble material is dissolved and removed by …
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The paper concerns a hydrometallurgical method for selective recovery of copper from low-grade electric and electronic wastes. The following consecutive stages were …
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The ammonia leaching method can efficiently recover the spent Lithium-ion batteries (LIBs), and the reuse of ammonia leachate is a difficult problem. ... Copper extraction from the ammonia leach liquor of spent lithium ion batteries for regenerating LiNi 0.5 Co 0.5 O 2 by co-precipitation. Hydrometallurgy, 193 (2020), p. 105310, 10.1016/j ...
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Although ammonia leaching of copper from slags has been reported generally as a part of copper slag utilization methods, but no detailed studies have been reported in the literature. In this research, we tried to investigate the effect of different parameters on ammonia leaching of
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Ammoniacal leaching for dissolution of copper oxides. The pH in leaching should be controlled between pH 9–10. Ammonia leaching does not alter copper sulfides. PLS …
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Chalcopyrite is well known as being refractory to conventional leaching approaches at atmospheric pressure. 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 refreshment using ceramic media at room temperature. …
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In pyrometallurgical processes refining copper, the main source of loss in the conversion stage is from slag. This paper reports on research work treating converter slag containing high percentages of copper (36 wt%) using ammonium hydroxide at room temperature. Variables analyzed are solution pH, agitation, temperature, NH4OH concentration and particle …
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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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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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A new method of copper extraction from its ore is examined in this paper. Based on the electrokinetic processes used for soil remediation, the technique envisaged consists in the copper dissolution by ammonia solution using an electric field. ... Radmehr, V., Koleini J.M.S., Khalesi, R.M., Tavakoli Mohammadi, R.M., 2012. Ammonia leaching in the ...
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different ammonia leaching methods and present the major research activities in this field for copper. We have also presented the latest findings and related novel processes. Comparative assessment of
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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 current study investigated a hybrid approach using aqueous ammonia as a pH modifier for glycine-based lixiviant systems to leach copper …
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Ammonia and Amonium 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 of considerable advantages of leaching by these agents and elimination of problems associated with acid leaching has resulted in a new …
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Oxidative ammoniacal leaching of copper/chalcocite-rimmed pyrite has been studied with the aim of searching for the optimal conditions for the separation of the pyrite that would preclude the …
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