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Furthermore, chalcopyrite leaching in cupric chloride is faster than leaching with ferric chloride at equal concentrations of both (Parker et al., 1981, Hirato et al., 1987). Download full-size image; Fig. 8. Mass transfer of reactants and products of chalcopyrite leaching in ferric chloride with no agitation.
Request PDF on ResearchGate Ferric chloride leaching of chalcopyrite: Synergetic effect of CUCl2 This work presents a study of the leaching of chalcopyrite in acidic ferric chloride. Two ...
2017-11-22 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-
2017-9-20 chalcopyrite leaching in acidic ferric chloride solutions and to develop a method to predict E op. For this, effects of solution compositions and temperature on the redox potential dependence of chalcopyrite leaching in acidic chloride solutions containing ferric ions were investigated. Electrochemical study using a chalcopyrite
2018-3-28 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). Additional work has been done to improve the recovery of sulfur ...
2019-10-1 Previous U.S. Bureau of Mines (UTop selling) research on the leaching of chalcopyrite with ferric sulfate [Fe2(SO4)3] demonstrates that surfactant additions enhance chalcopyrite (CuFeS2) leaching and that surfactant selection has a significant impact on the initial leaching rate. Additions of chloride ion (Cl-) are also known to enhance chalcopyrite leaching, although a review of the literature on ...
ferric chloride leaching of copper from chalcopyrite A Review on Novel Techniques for Chalcopyrite Ore Processing. The FeOOH formation in addition to the elemental sulphur favours chalcopyrite dissolution. Al Harahsheh (2008) used ferric chloride leaching of copper from chalcopyrite.
2018-6-28 Copper extraction from primary copper sulfide ore from a typical porphyry copper deposit from Antofagasta, Chile, was investigated after leaching with a chloride-ferrous media at two temperatures. The study focused on whether this chemical leaching system could be applied at an industrial scale. Leaching tests were conducted in columns loaded with approximately 50 kg of
2013-7-18 AbstractThe leaching of natural chalcopyrite was studied in both ferric chloride and ferric sulfate solutions. The morphology of leaching was studied by using a single chalcopyrite crystal and it appeared quite different with the two solutions. Ferric chloride produced a porous elemental sulfur layer whereas ferric sulfate resulted in the formation and peeling-off of an aggregate of plate-like ...
2010-9-13 Twelve cubic chalcopyrite samples (1 cm3) were leached in a copper(II) chloride solution for 1, 2, 4 and 22 hours at pH 1, 2 and 3. The sample surfaces were photographed with a Leica MZ6 stereomicroscope. Figure 1 shows the photographs of the chalcopyrite surface after leaching for 1 to 22 hours at pH from 1 to 3. It can be
2013-12-24 chemical leaching of chalcopyrite was increased 4-fold in the presence of 0.1 M ferrous iron compared with 0.1 M ferric iron. Cordoba . et al.  studied the influence of ferric iron on chalcopyrite dissolution at low and high solution potentials and found that although ferric iron was responsible for the oxidation of chalcopyrite, ferrous
While the electronic character of the lower part of the conduction band is given by Fe 3d orbitals, the upper part of the valence band is given by Cu 3d and S 3p orbitals. 3. Chemical leaching of chalcopyrite with ferric ion The leaching of copper from sulphide ore bodies occurs naturally, releasing copper
2007-1-26 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
Read "Ferric chloride leaching of mechanically activated chalcopyrite, Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
2017-12-1 Al-Harahsheh (2008) used ferric chloride leaching of copper from chalcopyrite. The effect of stirring speed and temperature on chalcopyrite leaching were investigated. Agitation was found to have a negative effect on cupric ion, the fact that cupric complexes are formed during the leaching process where the cupric ion is considered as a string ...
Based on the experimental evidence, it was concluded that the presence of pyrite in the leaching of chalcopyrite in H2SO4-NaCl-O2 solutions enhances the dissolution of copper through a galvanic interaction between pyrite and chalcopyrite. Additions of ferrous sulfate also increase chalcopyrite leaching rate effectively.
2012-5-2 The ferric ion consumption rates (i.e., chemical leaching rates) calculated from the on-line redox potential undulations matched well with the copper release rates obtained from copper analyses, showing that approximately four moles of ferric ions were consumed
2016-12-8 Electrochemical Study of Oxygen Reduction Reaction on Natural Chalcopyrite in Sulfuric Acid and Ferric Solutions ... mechanisms and try to raise the recovery rate of copper from chalcopyrite. If the potential of the ... of other oxidants? Nevertheless, the dissolved oxygen reduction behavior during chalcopyrite leaching
2019-9-25 Moreover, chloride is a catalyst of chalcopyrite leaching. Speciﬁcally, the effects of temperature (70 °C to 90 °C) and reagent (Fe3+,Cu2+ and Cl−) concentrations on the leaching kinetics were determined. The results showed that chalcopyrite leaching was faster with Cu2+ (larger rate constant) than with Fe 3+, but the activation energy
2011-7-30 Leaching of Chalcopyrite with Sodium Hypochlorite_理学_高等教育_教育专区 3人阅读1次下载 Leaching of Chalcopyrite with Sodium Hypochlorite_理学_高等教育_教育专区。生物冶金
2009-1-27 evidences on the passivation of chalcopyrite during its chemical leaching with ferric sulphate at 68 C. That leaching process seems to be greatly affected by the formation of a layer of jarosite on the chalcopyrite surface. Thus, the copper dissolution rate could be indirectly affected by pH because of iron hydrolysis. In this study, 0 10 20 30 ...
2016-7-13 Elemental sulfur produced by chloride leaching of sulfide ores or concentrates contains selenium and tellurium usually too high to be used in various industrial or agricultural uses. The sulfur in the leaching residue can be upgraded to 90% in grade by froth flotation and the sulfur concentration can be followed by sulfur purification and selenium and tellurium removal.
2016-1-29 chloride system were a result of catalysis of the reaction by cupric ions and that ferric chloride leaching is in reality cupric chloride leaching. Even though temperature is one of the most important parameters in the kinetics of the leaching of chalcopyrite in chloride media, it has been difficult to determine its effect accurately (Dutrizac ...
Currently the vast majority of the world’s copper is obtained through sulfide mineral processing. Among the copper sulfides, chalcopyrite is the most economically relevant due to its abundance. Therefore, several technologies have been developed in order to achieve an efficient copper extraction from copper sulfides. Among these developments, the hydrometallurgical options of bioleaching as ...
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