leaching of copper from tailings using ammonia
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- leaching of copper from tailings using ammonia
According to these results, it can be said that basic leaching conditions for copper extraction from tailings is optimal if ammonia can be recovered and used in the process. On the other hand, it is seen that higher ammonium extraction can be obtained under conditions if an ammonium persulfate mixture is …
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copper tailings. The proportion of the refractory combination oxide copper (chrysocolla) is 64.84%. ... Leaching can be divided into two types, namely, acid leaching and ammonia leaching [7,8], named
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Ammonia is known to be an effective leaching agent in hydrometallurgical processes. Despite being initially used to selectively extract Cu, ammoniacal leaching has been expanded towards a range of other non-ferrous metals, e.g., Zn, Ni, Co, Ag, and Au [1,2,3,4,5].The performance of ammoniacal metal extraction systems is determined by …
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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 Fig. 4. A total [NH 3 + NH 4 +] concentration above 4 mol L −1 had a negligible effect on the leaching efficiencies of copper and zinc (Fig. 4a, Table S2).
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Replacing the first step of glycine copper leaching with nitric acid can substantially reduce the environmental footprints of the process to a lower level than many other proposed recycling routes. ... (>64%) and gold (>75%) leaching, with ammonia as a pH modifier (pH 10.5), from sulfide-rich and copper-bearing gold flotation tailing (Li et al ...
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Since that time, a large number of studies have been carried out to study the kinetics of leaching various copper ores and copper-containing wastes in ammonia media at atmospheric [27][28][29][30 ...
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The Ammonia leach for copper recovery, Leaching and Recovery Copper from As-Mined Materias, W. J. Schlitt edn., SME/AIME, ... Leaching of copper from tailings using ammonia/ammonium chloride solution and its dynamics, International Conference on Chemistry and Chemical Engineering (ICCCE 2010). Habashi, F, 1963.
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The leach solution is boiled to recover the ammonia, while the thiosulphates and thiosulfonates are dismutated for precipitating to copper of high purity [32, 33]. The flow of pressure ammonia leaching is shown in Fig. 3 .
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As ore grades constantly decline, more copper tailings, which still contain a considerable amount of unrecovered copper, are expected to be produced as a byproduct of froth flotation. This research reveals the occurrence mechanism of copper minerals in typical copper sulfide tailings using quantitative mineral liberation analysis (MLA) …
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The accumulation of mine tailings on Earth is a serious environmental challenge. The importance for the recovery of heavy metals, together with the economic benefits of precious and base metals, is a strong incentive to develop sustainable methods to recover metals from tailings. Currently, researchers are attempting to improve the …
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A novel glycine-ammonia leaching was used to selectively extract >99% copper, >85% zinc and around 50% lead at room temperature. ... Extraction of Gold and Copper from Flotation Tailings Using ...
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Copper leaching from ore using ammonia should be followed by selective extraction of copper using the extraction agent in the solvent extraction process. LIX63 …
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The refinery at Fort Saskatchewan was one of the first to utilise ammonia as a leaching reagent (Cooper and Mihaylov, 1997).The ammoniacal process involves pressure leaching of the nickel concentrate and matte with ammonia and oxygen in a series of autoclaves operating at 105–120 °C (Crundwell et al., 2011).This process aims to …
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Accordingly, as a result of 6 h of leaching at 30 °C in the presence of 22.5% NH4OH and 100 g/L (NH4)2S2O8, 91.47% of the copper was transferred into the …
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To comprehensively reuse lead-zinc tailings, the recovery of valuable metals from magnetic tailings after iron recovery from lead-zinc tailings using roasting followed by chloride leaching was studied in this paper. The recovery of metals was investigated by studying the effects of roasting temperature, leaching temperature, liquid-to-solid ratio, …
به خواندن ادامه دهیدleaching system for the leaching of gold and copper from high-sulfide and copper-bearing flotation tailings generated from a gold mine. Potassium permanganate, as a common strong oxidant, was selected as the oxidant for the leaching system. Ammonia, known for its high efficiency in leaching copper [15], was introduced into the system for …
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The cyanidation of copper flotation tailings containing sulfides for gold recovery is an example of the formation of cyanide complexes with copper and silver during the leaching process [11,12]. …
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We execute a kinetics study of silver leaching from tailings, using thiosulfate. • Reaction orders are 1 (oxygen), 0.07 (thiosulfate), 0.45 (pH) and 0.26 (copper). • The activation energy in the range of temperatures 288–328 K was 1.91 kJ·mol − 1. • The kinetics is controlled by, mass transfer of oxygen, in the solid–liquid surface
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Volume 117, Issues 2–3, 31 January 2005, Pages 179-183. Electrodialytic remediation of copper mine tailings. Author links open overlay panel Henrik K. Hansen a, Adrián Rojo a, Lisbeth M. Ottosen b
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Section snippets Material. The copper oxide ore sample used for the experiments was obtained from the Katanga province, D.R. Congo. Commercial grade reagent, 98% H 2 SO 4 was used for the leaching tests. The sample was subjected to particle size distribution analysis which indicated that the ore sample had a P80 particle …
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Moreover, leaching experiments were performed using deionized water. 2.2 Leaching Test. The dissolution test was performed in a 600-mL leaching reactor, using a hot plate equipped with a magnetic stirrer, a condenser, and a thermometer for controlling reaction temperature. During leaching, 10 g/L of the prepared ammonia, ammonium …
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The main objectives of this article were to firstly decrease the amount of sulfide in the (Volcanic Massive Sulfide –VMS) in the eastern Sudan (Ariab) area through a roasting pretreatment, secondly determine the best and optimum (thiosulfate concentration – ammonia concentration – copper sulfate concentration - leaching time – pH) for …
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Although a lot of studies have been performed on the extraction of copper from aqueous solutions, there is limited data on PLS obtained from leaching with …
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Abstract . Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallur- gical processes due to low toxicity and cost, easy recovery and …
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The ammonia–cyanide leach system was first patented over 100 years ago and stands out as a unique method of selectively leaching up to 90% Au and <1% Cu from oxidised copper–gold ores using <10% NaCN used in conventional cyanidation processes. However, the system has proved to be difficult to control and predict performance with …
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The highest copper extraction efficiency was obtained in the leaching process that was conducted with the solutions obtained by mixing ammonia salts in the best conditions. …
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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 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 …
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A copper extraction of 91.5% was achieved after 72 h of leaching by using 0.71 M ammonia, at a Gly:Cu molar ratio of 4:1, by using a solid content of 1%, with a ceramic media: solid ratio of 3:5 ...
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This study presents the novel idea of a cyanide-free leaching method, i.e., glycine-ammonia leaching in the presence of permanganate, to treat a low-grade and copper-bearing gold tailing. Ammonia played a key role as a pH modifier, lixiviant and potential catalyst (as cupric ammine) in this study. Replacing ammonia with other pH …
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The dominating copper phases in the slag are Cu, Cu 2 O and CuFeO 2 (XRD and SEM-EDS). Leaching copper from these phases using sulfuric acid has a fast dissolution kinetics. Smaller particle size, higher temperature (up to 40 °C) and increasing mixing power (up to 0.26 kW/m 3) enhance the leaching kinetics.
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Selective extraction of copper from tailings was successively investigated by Turan et al. using a mixture of ammonia salts as leaching reactants and managed to obtain a copper recovery of 91.47% with no iron tenors to the leachate after 6 …
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The use of ammoniumâˆ'thiosulfate solutions to leach gold and silver from the oxidizing leaching residue of copper sulfide concentrates was reported by BEREZOWSKY and SEFTON in 1979 [25]. The authors claimed that the leaching rate of gold was higher than that by conventional cyanidation and halogen leaching method.
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Leaching of copper from tailings using. ... A copper extraction of 91.5% was achieved after 72 h of leaching by using 0.71 M ammonia, at a Gly:Cu molar ratio of 4:1, by using a solid content of 1% ...
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A comparison leaching with alkaline bacteria, ammonia or a combination of the two clearly indicated that copper recovery was remarkably better with combination …
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A novel glycine-ammonia leaching was used to selectively extract >99% copper, >85% zinc and around 50% lead at room temperature. ... Extraction of Gold and Copper from Flotation Tailings Using ...
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The optimum leaching conditions are found to be: 4/1 liquid/solid ratio, 4h leaching time, 40°C, 3 mol/L NH4 +. More than 75% of copper was effectively …
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The recovery rate of nickel, cobalt, and copper can reach 90%, 50%, and 88%, respectively, through ammonia leaching process. It can be realized that the resource utilization of sulfur in nickel sulfide concentrate by pressure ammonia leaching.
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The main important parameters in ammonia leaching of copper tailings have been prioritized as solid/liquid ratio, leaching time, temperature and the concentration of …
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