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Request PDF | Use of Ammonia Salts in Selective Copper Extraction from Tailings | Tailings (flotation waste) that is formed during copper production may be considered in the class of valuable ...2.2.. Conventional leachingAll conventional leaching experiments were performed using 30 g of ore with grain size lower than 200 μm.Mixtures of ammoniac and ammonium chloride were used as leaching reagents to obtain a buffered solution at …
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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 …Abstract An extensive literature survey on the principles and applications of ammonia leaching processes in hydrometallurgy is presented in this paper. The combination of ammonia anal ammonium salts is known to be a powerful lixiviant used in hydrometallurgical processes. Many metals can be extracted using the mixture of ammonia/ammonium. The …
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PDF | A solid waste sample from acidic leaching of Alluoga sedimentary rocks, SW Sinai, Egypt, was processed for leaching and extraction of U and Cu... | Find, read and cite all the research you ...DOI: 10.1016/J.MINPRO.2013.07.009 Corpus ID: 54814938; Recovery of value metals from copper smelter slag by ammonium chloride treatment @article{Nadirov2013RecoveryOV, title={Recovery of value metals from copper smelter slag by ammonium chloride treatment}, author={Rashid K. Nadirov and Leila I. Syzdykova and …
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The ammonium carbonate leaching performs better in selectivity over the vanadium than the sulfuric acid leaching, but collection of ammonia and enrichment of …The first sample of flotation tailings contained 0.26% of copper, 0.22% of zinc, and 17.4% of iron;; while the second sample contained 0.36% of copper, 0.23% of zinc, and 23.2% of iron. Percolation leaching made it possible to extract up to 43 …
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1990). Many workers have examined copper ores purification for possible industrial utilization by hydrometallurgical method in different media with limited data on covellite ore treatments. In the dissolu-tion and kinetic studies of copper ore using different reagents such as hydrochloric acid, sulphuric acid, ammonia, ammonium chloride and ...In this study, a cleaner metal extraction method for sulfide tailings using combined leaching with an ammonia solution and novel alkaline bacterium was proposed to solve the previously mentioned problems. Based on our findings, the following conclusions can be drawn: • Based on the 16s rDNA sequence, a novel strain of alkaline Acknowledgements
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Ammonia leaching for tailings from a copper mine [J] Nonferrous Metals, 56 (3) (2004), pp. 54-56 (in Chinese). Google Scholar. 5. ... Dissolution kinetics of low grade complex copper ore in ammonia-ammonium chloride solution [J] Transactions of Nonferrous Metals Society of China, 20 (5) ...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(NH3)42+) being the most stable. In order to suppress the unit operation of …
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The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were investigated.Investigation of the leaching behaviour of near infrared sensor-based pre-concentrated and classified copper ore samples in ammonium chloride solution was studied to understand the trend in copper extraction. The mineralogical and chemical content of the ore was evaluated using QEMSCAN® and ICMPMS techniques. The effects of leaching ...
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The solution of ammonia and ammonium carbonate in a concentration of 12.5% was used as the solvent to leach for 2.5h at a temperature of 150℃, a pressure of 1925175~2026500Pa. The mother liquor can be distilled by steam at 90℃ to separate ammonia and carbon dioxide.The leaching kinetics of Tang-dan refractory low grade complex copper ore was investigated in ammonia-ammonium chloride solution. The concentration of ammonia and ammonium chloride, the ore particle size, the solid-to-liquid ratio and the temperature were chosen as parameters in the experiments. The results show that temperature, concentration ...
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Discussion. The copper ion in the aqueous solution of exists predominantly as [Cu (H 2 O) 6] 2+. This complex ion imparts a characteristic pale blue color to the solution. Since ammonia is a weak base, when it is added, hydroxide ion forms: NH 3 ( aq) + H 2 O ( l) <==> NH 4+ ( aq) + OH - ( aq ); pK b = 9.25 (1) The hydroxide ion reacts with the ...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. The main copper...
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This research was aimed to investigate the leaching behavior of zinc and copper from a porcelain stone tailings sample using RSM-CCD modeling. The synergetic and individual effects of five main factors including liquid/solid ratio, sulfuric acid concentration, agitation speed, leaching time, and temperature were examined on the recoveries of zinc and copper. For this …(PDF) Copper(II) extraction from ammonia leach solution. Ammonium salts and other complex forming reagents are widely used for leaching copper from high gangue complex ores (Ekmekyapar et al., 2012; Ochromowicz et al., 2014). The recovery process of . ammonia-ammonium chloride leach copper … Read More
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Abstract The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a...To identify which material sources could be suitable for leaching with ammonia, a preliminary screen of eight primary and secondary materials was performed with both synthetic and biogenic ammonia poised at a total ammonia concentration of 1 mol L −1.After a contact time of 24 h, target metals Cu, Zn or Ni generally dominated in the pregnant solution (Fig. 1, …
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Apr 01, 2013· 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. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%.copper electrowinning from cupric chloride solution. The electrowinning of copper from a cupric chloride ... Abstract. There are several references to electrowinning copper from chloride solutions (e.g. 1-4), the copper being recovered in powder form. Ashcroft (5) and Hazen (6) have mentioned the possi-
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