Mar 01, 2008· The effect of agitation on the leaching of chalcopyrite concentrate in ferric chloride in presence and absence of cupric chloride (C FeCl3: 0.5 M, T = 90 °C, < 25 µm). Similarly, the amount sulphate sulphur measured in the leaching solution was found to have the same trend as for the copper recovered as shown in Fig. 10 .
Dec 01, 2007· Two new process flowsheets have been developed which combine chloride leaching of copper from chalcopyrite with solvent extraction, to selectively transfer copper to a conventional sulfate electrowinning circuit.
In order to leach chalcopyrite and chalcocite under atmospheric or high pressure leaching conditions in sulfate or chloride medium, ferric and copper ions
Leaching of chalcopyrite with acidified ferric chloride and carbon tetrachloride addition Minerals Engineering, Vol. 8, No. 10, pp. 1125-1134, 1995 Pergamon 0892-6875(95)00077-1 LEACHING OF CHALCOPYRITE WITH ACIDIFIED FERRIC AND CARBON T...
In addition numerous studies showed that leaching of chalcopyrite in chloride media results in higher copper extractions than in sulfate media 162324 The main reasons are the formation of chloride complexes which change the electrochemical behavior of chalcopyrite passivation andor the higher porosity of the mineral surface 81625. Details
May 01, 2013· Copper leaching from chalcopyrite concentrate in ferric and cupric chloride system was investigated using a two-stage countercurrent leach circuit under a nitrogen atmosphere at 97 °C to minimize the concentrations of cupric and ferric ions in pregnant leach solution for subsequent copper solvent extraction while maintaining a maximum copper extraction.
Munoz-Ribadeneira and Gomberg, on the other hand, reported that 0.05 to 1.0N NaCl (sodium chloride) (0.29 to 5.8 g/L) improves copper leaching at 23 to 25 °C in 1N H2SO4, while Dutrizac and others reported that 6 g/L NaCl inhibits chalcopyrite leaching in 0.1M Fe2 (SO4)3-0.1M H2SO4 at 25 °C.
Many chalcopyrite leaching studies have been performed with leachants such as ferric sulfate [4–7], ferric chloride [7,8], sodium nitrate-sulfuric acid, hydrochloric acid, and sodium chloride-sulfuric acid, among others. The slow copper from chalcopyrite dissolution has been attributed to the formation of a
Oct 01, 1995· CONCLUSIONS The leaching tests, carried out with relatively pure natural chalcopyrite in acidified ferric chloride solutions without and with carbon tetrachloride showed improved extraction yields for copper by the addition of CCI4 for elemental sulfur
POX in a copper heap leach circuit. Figure 2. Simplified ferric leaching flowsheet. Figure 3. Copper chloride leach process. Leaching Chemistry As outlined earlier, the leaching chemistry that takes place within a total POX autoclave is very complex and will vary from case to case according to the mineralogy of the concentrate fed to the
systems relies on the high solubility of both copper and ferric iron in these systems as well as the easiness of ferric ion regeneration. In addition, chalcopyrite leach-ing with ferric chloride shows faster kinetics than ferric sulphate solutions. These studies have also suggested that the sulphur formed as reaction product is more
DOI: 10.1007/BF03355683 Corpus ID: 101409809. Recovery of Copper, Iron, and Sulfur from Chalcopyrite Concentrate using a Ferric Chloride Leach
Ferric chloride leaching can be made selective, and more than 99 pct lead extraction can be obtained in 15 min. Additional leaching time increases solubilization of chalcopyrite and sphalerite. Because leaching and filtration were performed batchwise in the experimental unit, the contact time between solution and concentrate was at least 30 min
Although the leaching efficiency of chalcopyrite was very low at ambient temperature, the percentages of copper dissolved in the presence of hydrogen peroxide (H2O2) and ferric sulfate (Fe2(SO4)3
A comparative study of electrochemical leaching and chemical leaching of chalcopyrite was done to elucidate the leaching mechanism of chalcopyrite with FeCl3. The leaching rate of chalcopyrite exhibits a half order dependency on the FeCl3 concentration, whereas it is independent of the FeCl2 concentration. The mixed potential of chalcopyrite exhibits a 72 mV · decade−1 dependency upon
leaching of chalcopyrite. The most often used lixiviants are acidic chloride media, acidic sulfate media and basic ammonia solutions, together with various oxidizing agents.3–7 The most often used oxidizing agents are oxygen, ferric sulfate, ferric chloride or cupric chloride.8–13 Various other oxi-
The leaching kinetics of natural chalcopyrite crystals with ferric sulfate was studied. The morphology of the leached chalcopyrite and the electrochemical properties of chalcopyrite electrodes also were investigated. The leaching of chalcopyrite showed parabolic-like
Perceived advantages of chloride systems are the higher solubilities of copper and iron, the ease of ferrous ion oxidation and faster leaching kinetics of chalcopyrite compared with ferric sulfate
2007). Elemental sulfur formed during the leaching of chalcopyrite with ferric chloride is also more porous than that formed with ferric sulfate, thus the leaching rate is an order of magnitude larger in the former (Majima et al., 1985). Peters (1976a) reported that chalcopyrite, the
A hydrometallurgical method of recovering copper from a material, in a heap, that contains a copper sulphide mineral which contains at least chalcopyrite comprising leaching the material in an acidic chloride solution or a mixed chloride/sulphate solution in the presence of dissolved oxygen and maintaining the mineral's surface potential within
The copper extraction achieved in seawater systems were higher than in water systems under the same leaching conditions (increased by an average of 18 wt %). This effect can be attributable to the contribution of chloride that increases proton (H+) activity. Keywords: nitrate; chalcopyrite; chloride; leaching; seawater 1. Introduction
For the final reaction 16 mol of ferric chloride are necessary for an entire oxidation of one mol of chalcopyrite, this means that for 1 gr of chalcopyrite 14.14 g of FeCl 3 are required, nevertheless due to the final products of the leaching process in the present and other previous studies (Majima, Awakura et al. 1985, Havlík, Škrobian et
the leaching of chalcopyrite (based on the copper present in the residue), column 5 shows an extraction A. Ferric chloride leaching of chalcopyrite: Synergetic effect. of CuCl 2
Dec 11, 2014· In a strong chloride solution the predominant cuprous, cupric, ferrous, and ferric chloride complexes are CuCl3 −2, CuCl+, CuCl2, FeCl2, and FeCl2 + respectively. The probable dissolution reaction for chalcopyrite in cupric chloride solution is CuFeS2 + 3CuCl+ + 11Cl−2 = 4CuCl3 −2 + FeCl2 + 2S The standard free energy change for this reaction at 25°C and unit activities is
In general, the leaching of chalcopyrite is more effective in chloride solutions with cupric ions as the oxidant than in sulfate solutions with ferric ions as the oxidant. This is possibly due to kinetic rather than thermodynamic considerations e.g. the higher rates of electron transfer in chloride
A method to recover copper and elemental sulfur from chalcopyrite concentrate, using a ferric chloride leach, cufes2 + 3fecl3 -> cucl + 4fecl2 + 2s, was reported by the federal Bureau of Mines in 1971 (report of investigations 7474).
Sequential leaching with water and acid removed ~85% of the chloride prior to bio-processing, while ~13% of the copper present in the ore was leached using sulfuric acid, and a further 39
chalcopyrite leaching in chloride acid solutions is not fully understood and it triggers difficult to predict the value of E op under given conditions. The aim of the present study is to establish the mechanism of chalcopyrite leaching in acidic ferric chloride solutions and
In sulfate media, the leaching kinetics are generally slow (several months) and the leaching of copper is difficult to be complete, due to the formation of passivation layers on the surface of chalcopyrite, such as solid sulfur and iron precipitate (e.g. jarosite). 1 In chloride media, the leaching rate is faster than that in sulfate media, due
mixtures during the leach (to regenerate in-situ the ferric needed to extract the copper) allows similar good extractions (>95% Cu) to be achieved with only 10 g/L iron in solution, as indicated in Table III. Such leach solutions would be much easier to process. Table III Summary Results of Regenerated Ferric Sulphate Leach (10% solids, 2% SO
Abstract: Chalcopyrite leaching in acidic chloride solution with-out sulphates. The effect of dissolved oxygen and ferrous/ferric/cu-pric ions in solution on the leaching behavior of chalcopyrite and the phenomenology of the passivating layer formation on the chalcopyrite surface in an aqueous acidic chlorinated medium with dissolved oxy-
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