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  • Copper Leaching Method Metallurgist & Mineral Processing

    Copper Leaching Practices. For centuries small amounts of copper have been recovered from acid mine-drainage waters. In recent years, the expansion of copper-bearing waste dump leaching for copper recovery has established a technological basis that is rapidly converting the art of copper leaching into a science.

  • A Kinetic and Thermodynamic Modeling Approach

    These questions can be answered by modeling mineral leaching kinetics concurrently with reliable thermodynamic data covering the range of conditions (ionic strength, temperature, and species) of interest. The kinetic and thermodynamic data can be obtained from various databases attached

  • Cited by: 1
  • (271g) Thermodynamics and Kinetics for KOH Leaching of

    In the proposed gradient leaching process, alunite from tailings is selectively extracted, while impurities of kaolinite and quartz, are still remained in the leaching residues. Here, we shall investigate reaction thermodynamics, reaction kinetics and dissolution mechanism of alunite from copper

  • Effect of temperature on copper, iron and lead leaching

    Effect of temperature on copper, iron and lead leaching from e-waste using citrate solutions. The upper-most zone corresponds to the thermodynamic conditions under which the three metals (Cu, Fe and Pb) form soluble complexes with citrate, or in other words, which favors leaching. On the other hand, in the inferior zone, metallic or oxide

  • Cited by: 10
  • Copper and Cyanide Recovery in Cyanidation Effluents

    Copper and Cyanide Recovery in Cyanidation Effluents José R. Parga1, lute cyanide solution, typical of leach conditions found in the gold cyanidation process. Minerals such as azurite and malaquite, are fast leached and soluble in dilute cya- Copper and Cyanide Recovery in Cyanidation Effluents

  • Cited by: 3
  • Leaching of copper(I) sulphide by sulphuric acid solution

    This paper aims to investigate the leaching process of copper(I) sulphide by sulphuric acid solution in the presence of sodium nitrate as it has not been studied sufficiently either from the theoretical or practical point of view. 2. Chemical reaction and thermodynamics

  • Cited by: 34
  • Thermodynamic analysis of the copper (I) homogeneous and

    Sep 09, 2019· Thermodynamic analysis of the copper (I) homogeneous and heterogeneous speciation in ammonium thiosulfate leaching systems. Igor Povar, a Stefano Ubaldini, b Oxana Spinu, a Tudor Lupascu a. a Institute of Chemistry, 3 Academiei str., Chisinau, MD2028, Republic of Moldova.

  • Author: Igor Povar, Stefano Ubaldini, Oxana Spinu, Tudor Lupascu
  • Extraction of Tin and Copper by Acid Leaching of PCBs

    Extraction of Tin and Copper by Acid Leaching of PCBs Amit Chaurasia*, K. K. Singh, T. R. Mankhand Department of Metallurgical Engineering, Indian Institute of Technology, (BHU), Varanasi, 221005, India . Abstract . Printed circuit board (PCB) waste is generally dumped as a landfilling or treated pyrometallurgically, which

  • (PDF) Kinetics of chalcopyrite leaching by sodium nitrate

    Kinetics of chalcopyrite leaching by sodium nitrate in sulphuric acid. thermodynamic analysis, and the products formed during the leaching process. under the same leaching conditions, only

  • (PDF) Kinetics of chalcopyrite leaching by sodium nitrate

    Kinetics of chalcopyrite leaching by sodium nitrate in sulphuric acid. thermodynamic analysis, and the products formed during the leaching process. under the same leaching conditions, only

  • Thermodynamic Analysis of Possible Chalcopyrite

    conditions for the surface chemical reaction, which will be helpful to understand the dissolution process. In the present paper, the possible reaction routes of chalcopyrite leaching in sulfuric acid media under ambient conditions are analyzed based on thermodynamic principals, which aims to further the understanding of the above phenomena. 2.

  • A kinetic–thermodynamic study of silver leaching in

    Mar 01, 2013· Read "A kinetic–thermodynamic study of silver leaching in thiosulfate–copper–ammonia–EDTA solutions, Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

  • Published in: Hydrometallurgy · 2013Authors: D M Puentesiller · J C Fuentesaceituno · F NavaalonsoAbout: Thiosulfate · Leaching
  • Thermodynamics of malachite in gold cyanide leaching

    A kinetic and thermodynamic model of cyanide heap leaching of copper-bearing gold ores was developed in order to facilitate the evaluation and treatment of these complex ores

  • Thermodynamics of reactions during nitric acid leaching of

    May 12, 2011· Conditions for the effective dissolution of sulfides without the isolation of elemental sulfur and iron oxides Thermodynamics of reactions during nitric acid leaching of minerals of a copper concentrate. The acquired thermodynamic characteristics of leaching of the copper concentrate with nitric acid can be used when selecting the

  • Thermodynamics Processes of Nitric Acid Leaching of

    Thermodynamics processes of nitric acid leaching 1791 3 Results and discussion To determine the most probable conditions of formation of the desired leaching products of sulfide middlings in nitric acid, the mutual influence of the components produced pulp on the performance of the process, conducted the

  • Thermodynamic and kinetic of iodine iodide leaching in

    Research Stainless Steel Copper Zinc Metals. The results of kinetics studies of gold dissolution in iodide solutions using the rotating disc method were presented. 3 Results and discussion 3.1 Thermodynamic conditions for gold recovery from gold-containing materials with iodide solutions The thermodynamic calculations developed by the

  • Published in: Transactions of Nonferrous Metals Society of China · 2015Authors: S S Konyratbekova · A Baikonurova · G A Ussoltseva · Ceren Erust · Ata AkcilAffiliation: Satbayev Kazakh National Technical University · Suleyman Demirel UniversityAbout: Hydrometallurgy
  • The thermodynamic chemistry of the aqueous copper

    A fundamental thermodynamic study was undertaken in order to establish the speciation of copper(I) and copper(II) during the leaching and recovery of gold from thiosulfate-copper-ammonia solutions. Despite considerable research into this complex leaching system, the lack of important fundamental chemistry has delayed the implementation of the thiosulfate process as an alternative to cyanidation.

  • (PDF) Extraction of copper, zinc, nickel and cobalt in

    Extraction of copper, zinc, nickel and cobalt in acid oxidative leaching of chalcopyrite at the presence of deep-sea manganese nodules as oxidant this abrupt change could be observed even after 10 Under more extreme experimental conditions, i.e. at min. It follows from the thermodynamic study that some metal sulphides could be formed

  • Thermodynamic analysis of the copper (I) homogeneous and

    Sep 09, 2019· The paper presents a new thermodynamic approach to studying mixed ligand complex formation reactions in the multi-component two-phase system “cuprous oxide-ammoniacal copper (I) thiosulfate aqueous solution” under real conditions.

  • Thermodynamic Modelling of Iron Solubility in Sulphide

    In this study the effects of pH and temperature on iron solubility were predicted using the geochemical modelling code PHREEQC and the thermodynamic database WATEQ4F. The modelling results demonstrated that the solubility of secondary solid phases formed under acid bioleaching conditions decreases with increasing temperature and also with increasing pH.

  • Associated Sulfide Minerals in Thiosulfate Leaching of

    High copper concentration and a pre-aeration step was also found to largely increase the gold extractions under such conditions. Thiosulfate-copper-ethylenediamine system was found effective in the leaching of gold. The leaching kinetics was significantly slower than that of the conventional thiosulfate-copper-ammonia leaching.

  • Thermodynamic Research of Leaching Copper Oxide Materials

    AbstractThe solubilities of copper hydroxide Cu(OH)2, copper oxide CuO, atacamite Cu(OH)1.5Cl0.5, malachite Cu2(OH)2CO3 and chessylite Cu3(OH)2(CO3)2 in an ammonia-ammonium chloride-water solution were calculated using an exponential computation method based on both mass balance and charge balance equations. The range of stability of each solid phase was also established.

  • Energy Efficiency & Copper Hydrometallurgy

    Copper Hydrometallurgy Heap/stockpile leaching Early 1900s Iron cementation Early 1900s Direct electrowinning Early 1900s Roasting, leaching, electrowinning 1960-70s SX/EW 1970-80s Enhanced sulfide heap/stockpile leaching 1990-2000s Concentrate pressure leaching 2000s

  • Thermodynamic Modelling of Iron Solubility in Sulphide

    In this study the effects of pH and temperature on iron solubility were predicted using the geochemical modelling code PHREEQC and the thermodynamic database WATEQ4F. The modelling results demonstrated that the solubility of secondary solid phases formed under acid bioleaching conditions decreases with increasing temperature and also with increasing pH.

  • Associated Sulfide Minerals in Thiosulfate Leaching of

    High copper concentration and a pre-aeration step was also found to largely increase the gold extractions under such conditions. Thiosulfate-copper-ethylenediamine system was found effective in the leaching of gold. The leaching kinetics was significantly slower than that of the conventional thiosulfate-copper-ammonia leaching.

  • Thermodynamic Research of Leaching Copper Oxide Materials

    AbstractThe solubilities of copper hydroxide Cu(OH)2, copper oxide CuO, atacamite Cu(OH)1.5Cl0.5, malachite Cu2(OH)2CO3 and chessylite Cu3(OH)2(CO3)2 in an ammonia-ammonium chloride-water solution were calculated using an exponential computation method based on both mass balance and charge balance equations. The range of stability of each solid phase was also established.

  • Energy Efficiency & Copper Hydrometallurgy

    Copper Hydrometallurgy Heap/stockpile leaching Early 1900s Iron cementation Early 1900s Direct electrowinning Early 1900s Roasting, leaching, electrowinning 1960-70s SX/EW 1970-80s Enhanced sulfide heap/stockpile leaching 1990-2000s Concentrate pressure leaching 2000s

  • In situ recovery, an alternative to conventional methods

    Copper is the most popular commodity (after uranium) that is mined by ISR (Table 1). There are references to primitive forms of in situ leaching of copper in Roman times, and maybe even long before that in China (O'Gorman et al., 2004). The San Manuel copper mine in Arizona is the best known copper mine exploited by ISR (O'Gorman et al., 2004).

  • A review of chloride assisted copper sulfide leaching by

    A review of chloride assisted copper sulfide leaching by oxygenated sulfuric acid and mechanistic considerations G. Senanayake* Parker Centre, Faculty of Minerals and Energy, Murdoch University, Perth, WA 6150, Australia Abstract The beneficial effect of chloride on sulfide leaching

  • Copper extraction Wikipedia

    Copper extraction refers to the methods used to obtain copper from its ores.The conversion of copper consists of a series of physical and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local environmental regulations, and other factors.

  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    thiosulphate leach solution onto copper metal powder, or some other reductant, following separation of solids and liquids in the leach slurry by filtration or counter current decantation. Use of the resin-in-pulp method is limited to those deposits requiring mild thiosulphate leaching conditions, since strong thiosulphate leach conditions result

  • UP-GRADATION OF MoO3 COPPER, IRON, ZINC FROM

    Up-Gradation of MoO3 and Separation of Copper, Iron, Zinc from Roasted Molybdenum Ore by a Leaching Process 393 Brazilian Journal of Chemical Engineering Vol. 30, No. 02, pp. 391 397, April June, 2013 oxide with improved content was obtained by a

  • Published in: Brazilian Journal of Chemical Engineering · 2013Authors: Jinyoung Lee · Jyothi Rajesh Kumar · Hoseok Jeon · Joonsoo Kim
  • Thermodynamic analysis of gold leaching by ammoniacal

    The mechanism of leaching gold using ammoniacal thiosulfate solution is driven by the Cu(II)-Cu(I) redox couple and is complicated by competing ligands such as NH 3 and S 2 O 3 2−. It is shown that an understanding of the copper speciation and sulfur speciation is required to optimize this system.

  • Fundamental aspects of gold leaching in thiosulfate solutions

    It may therefore be concluded that the leaching process is under anodic control under the majority of conditions tested (cathodic control will be important when the cupric ammine species is very dilute in solution). Experiments show that increasing the ratio of NH3/ S₂O₃²⁻ will favor the leaching rate.

  • Heap leaching Wikipedia

    In 2011 leaching, both heap leaching and in-situ leaching, produced 3.4 million metric tons of copper, 22 percent of world production. The largest copper heap leach operations are in Chile, Peru, and the southwestern United States. Although heap leaching is a low cost-process, it

  • Cu Leaching Using Regenerated Ferric Sulphate

    called the “Regenerated Ferric Sulphate Leaching (RFSL) process, in which the reoxidation of the ferrous ion is carried out under strictly atmospheric conditions, using SO. 2 /O. 2. mixtures as the oxidizing medium. The process is very effective and rapid, and the reoxidation step can be accomplished during the leach itself or in a separate

  • Leaching Ecological Behavior of Indium from Lead

    Leaching Ecological Behavior of Indium from Lead Containing Copper Matte Using Oxidation Roasting Leaching Process . Dafang Liu . 1,2, Xingxiang Fan 4. 2,3*, Yifeng Shi,Kunbin Yang . 4. 1. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650093, CHINA . 2

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