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Author : E. Schalch
Publisher :
ISBN 13 : 9780869995112
Total Pages : 13 pages
Book Rating : 4.9/5 (951 download)
Download or read book An Electrochemical Investigation of the Behaviour of Gold in Chloride Solutions written by E. Schalch and published by . This book was released on 1980 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (921 download)
Download or read book An Electrochemical and Kinetic Investigation of the Behaviour of Gold in Chloride Solutions. II. The Anodic Dissolution of Gold written by and published by . This book was released on 1976 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: An electrochemical investigation of the anodic dissolution of gold in aqueous chloride solutions has confirmed the formation of gold(I) in an intermediate step. The factors influencing the extent to which gold(I) accumulates in the solution have been established, and a kinetic model that accounts for the various observations has been developed. Cyclic voltammetry of gold in chloride solutions has revealed that the formation of oxide is responsible for the passivation that occurs at potentials at which the rate of transport of chloride to the surface becomes limiting.
Author :
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (921 download)
Download or read book An Electrochemical Investigation of the Behaviour of Gold in Chloride Solutions. IV. Results Obtained from Phase 2 of the Investigation written by and published by . This book was released on 1978 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of certain variables on the morphology and purity of gold cathodes were studied. The variables included temperature, current density, agitation, and the nature of the applied current. Both laboratory-scale and pilot-plant-scale cathodes were used. An unexpected correlation between the roughness and the purity of the cathodes was found. The more highly dendritic were the deposits, the less silver they contained as an impurity. The applications of this and related findings to plant practice are discussed, and operating procedures are recommended.
Author : M. J. Nichol
Publisher :
ISBN 13 : 9780869995402
Total Pages : 20 pages
Book Rating : 4.9/5 (954 download)
Download or read book An Electrochemical and Kinetic Investigation of the Behaviour of Gold in Chloride Solutions written by M. J. Nichol and published by . This book was released on 1981 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. J. Nichol
Publisher :
ISBN 13 : 9780869995396
Total Pages : 20 pages
Book Rating : 4.9/5 (953 download)
Download or read book An Electrochemical and Kinetic Investigation of the Behaviour of Gold in Chloride Solutions written by M. J. Nichol and published by . This book was released on 1981 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. Schalch
Publisher :
ISBN 13 : 9780869995389
Total Pages : 41 pages
Book Rating : 4.9/5 (953 download)
Download or read book An Electrochemical and Kinetic Investigation of the Behaviour of Gold in Chloride Solutions written by E. Schalch and published by . This book was released on 1981 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (921 download)
Download or read book An Electrochemical and Kinetic Investigation of the Behaviour of Gold in Chloride Solutions. III. The Gold (III)-gold(I) Reaction on Platinum and the Disproportionation of Gold (I). written by and published by . This book was released on 1976 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various electrochemical techniques were used in a study of the kinetics of the gold(III)-gold(I) couple on platinum in chloride solution, and of the initial stages of the deposition of gold on platinum. Differences in the behaviour of anodically treated platinum electrodes and gold electrodes were observed, and mechanisms are proposed for the reaction at both surfaces. The rate of homogeneous disproportionation of gold(I) in chloride solutions was found to be very slow, but it is catalysed at the surface of gold metal. The loss of gold as volatile species from a typical electrolyte at 50 degrees C has been shown to be negligible.
Author :
Publisher :
ISBN 13 :
Total Pages : 41 pages
Book Rating : 4.:/5 (921 download)
Download or read book An Electrochemical and Kinetic Investigation of the Behaviour of Gold in Chloride Solutions. 1. The Cathodic Deposition of Gold written by and published by . This book was released on 1976 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cathodic deposition of gold from acidic chloride solutions was investigated with the aim of improving the electrolytic-refining process in use at the Rand Refinery. The depositions were carried out using as cathodes a vertical rod or a rotating disc. An investigation was made of the influence on the quality of the deposits of current density, stirring intensity, temperature, concentration of gold (I), and composition of the electrolyte. The maximum applicable currents were found to correspond to the mass-transfer-controlled deposition of gold (III). The concentration of gold (I) had a marked influence on the quality of the deposit. A series of runs using cells of the electrolytic-refining plant showed that stratification of the electrolyte occurs if no stirring is applied. Suggestions are made, resulting from both the laboratory and pilot experiments, that should result in an improvement of the electrolytic-refining operation.
Download or read book An Electrochemical Study of Some Problems Related to the Electrorefining of Gold in Chloride Solutions written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive investigation of the chemical and electrochemical aspects of the electrorefining of gold in acidic chloride solutions has been carried out with a view to improving the overall performance of the process at the Rand Refinery. A laboratory study of the anodic dissolution of gold has confirmed the formation of gold(I) in an intermediate step. The factors influencing the extent to which gold(I) accumulates in the solution have been established and the kinetics of the disproportionation reaction, which produces the gold fines in the electrolyte, have been studied. The results of experiments designed to test the influence on the quality of the deposits of current density, agitation, temperature and composition of the electrolyte are described. The maximum applicable currents were found to correspond to the mass-transport-controlled deposition of gold(III) and the presence of gold(I) in the electrolyte has a marked influence on the quality of the deposits. The use of periodic current interruption was found to significantly improve the quality of the deposits whereas periodic current reversal produced deposits similar to those obtained with continuous current. The application of the results of the laboratory investigation to improvement of the process in plant-scale tests is described.
Author :
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.0/5 ( download)
Download or read book Unrestricted Mintek Publications written by and published by . This book was released on 1966 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 936 pages
Book Rating : 4.:/5 (3 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1986 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mike D. Adams
Publisher : Elsevier
ISBN 13 : 0444636706
Total Pages : 1050 pages
Book Rating : 4.4/5 (446 download)
Download or read book Gold Ore Processing written by Mike D. Adams and published by Elsevier. This book was released on 2016-05-03 with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing operation. This completely updated edition features coverage of established, newly implemented, and emerging technologies; updated case studies; and additional topics, including automated mineralogy and geometallurgy, cyanide code compliance, recovery of gold from e-waste, handling of gaseous emissions, mercury and arsenic, emerging non-cyanide leaching systems, hydro re-mining, water management, solid–liquid separation, and treatment of challenging ores such as double refractory carbonaceous sulfides. Outlining best practices in gold processing from a variety of perspectives, Gold Ore Processing: Project Development and Operations is a must-have reference for anyone working in the gold industry, including metallurgists, geologists, chemists, mining engineers, and many others. - Includes several new chapters presenting established, newly implemented, and emerging technologies in gold ore processing - Covers all aspects of gold ore processing, from feasibility and development stages through environmentally responsible operations, to the rehabilitation stage - Offers a mineralogy-based approach to gold ore process flowsheet development that has application to multiple ore types
Author : South African Institute of Mining and Metallurgy
Publisher :
ISBN 13 :
Total Pages : 620 pages
Book Rating : 4.F/5 ( download)
Download or read book Journal of the South African Institute of Mining and Metallurgy written by South African Institute of Mining and Metallurgy and published by . This book was released on 1981 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Institution of Mining & Metallurgy
Publisher : Springer Science & Business Media
ISBN 13 : 9401112142
Total Pages : 1146 pages
Book Rating : 4.4/5 (11 download)
Download or read book Hydrometallurgy ’94 written by Institution of Mining & Metallurgy and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrometallurgy '94 contains the 78 papers that were presented at the international symposium organized by the Institution of Mining and Metallurgy and the Society of Chemical Industry and held in Cambridge, England, in July 1994. In the papers specific attention is paid to the concept of sustainable development and the associated ideas of cleaner technology, recycling and waste minimization that have particular relevance to the extractiona nd processing of metals and other mineral products. The papers, by authors from 30 contries, are grouped under the headings: Hydrometallurgy and Sustainable Development; Materials Production and the Environment; Fundamentals; Leaching; Bioprocessing; Gold Solution Purification; Effluent Treatment; Processes; and Recycling.
Author : Christina Joann Sayer
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.:/5 (658 download)
Download or read book An Electrochemical Study at 25°C. of the Leaching Behaviour of Gold and Silver in Inorganic and Organic Solutions written by Christina Joann Sayer and published by . This book was released on 1986 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Raymond C. Bott
Publisher :
ISBN 13 :
Total Pages : 458 pages
Book Rating : 4.:/5 (222 download)
Download or read book The Electrochemical Oxidation of Metallic Gold and Application to the Synthesis of Gold(I) Tertiary Phosphine Complexes written by Raymond C. Bott and published by . This book was released on 1998 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This thesis presents research investigating the electrochemical oxidation of gold into non-aqueous media and application to the preparation of gold(I) phosphine compounds.--The processes occurring at the electrode surface during the oxidation of gold metal were investigated using surface enhanced FT-Raman scattering spectroscopy (SERS) and cyclic voltammetry (CV). The effects of oxidation on the gold electrode surface were studied using scanning electron microscopy (SEM) to observe surface profiles and species before and after oxidation. From SERS and CV results, the oxidation of gold involved the formation of a gold chloride surface layer which dissolved into the bulk solvent to complex with the phosphine ligands.--A range of tertiary aryl and alkyl phosphine gold(I) halide complexes (PR3AuX, X = C1, Br, I) were synthesised by electrochemical techniques and by reaction of the tertiary phosphines with the gold(I) salts, tetrabutylammonium dihaloaurate(I) ([NBu4][AuX2], X = C1, Br, I). The simplest electrochemical cell without a too great a loss of efficiency and product yield was found to be a batch type. Complexes were characterised using FT-Raman (FTR), solution and solid state 31P-{1H}-NMR, and single crystal X-Ray crystallographic (XRD) studies. As expected, for an increase in the gold halide bond length (of similar complexes with the same halide), both Raman and NMR studies displayed a decrease in the frequency and chemical shifts from the chloride to iodide complexes respectively.--The behaviour of gold ions in HCI acidified acetonitrile or propylene carbonate solutions were studied using proton decoupled phosphorus-31 nuclear magnetic resonance spectroscopy (31P- {1H} NMR). Titration of 1,2-bis(diphenylphosphino)ethane (dppe) by slowly electrochemically dissolving gold into the acetonitrile or propylene carbonate was followed using 31P-{1H) NMR and used to study the reaction equilibria of gold(I) phosphine systems formed as the gold chloride layers dissolved into acetonitrile or propylene carbonate solutions. 31P-{1H} NMR studies in acetonitrile were conducted at 38 +- 2 degrees C to prevent the precipitation of the 2:1 (Au:dppe) gold(I) chloride dppe complex. To prevent precipitation of this complex at ambient temperatures, propylene carbonate was used in place of the acetonitrile. Variable temperature 31P-{1H} NMR studies were used to resolve various broad peaks observed in the propylene carbonate system. These studies displayed the initial formation of the 1:2 (Au:dppe) gold(1) chloride dppe complex. As gold was added to this system, an equilibrium was formed between the tetrahedral complex, the 1:1 (Au:dppe) annular complex, and the 2:1 (Au:dppe) bridged complex. A small amount of ligand oxidation was observed which resulted in the formation of gold(I) chloride dppe monoxide complex.
Author : Minerals, Metals and Materials Society. Extraction and Processing Division
Publisher : Minerals, Metals, & Materials Society
ISBN 13 :
Total Pages : 1406 pages
Book Rating : 4.:/5 (38 download)
Download or read book EPD Congress 1992 written by Minerals, Metals and Materials Society. Extraction and Processing Division and published by Minerals, Metals, & Materials Society. This book was released on 1992 with total page 1406 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the third in a series of proceedings documenting the EPD Congress, held yearly at the TMS Annual Meeting. State-of-the-art information on the extraction and processing of a wide range of materials is contained in the volume.
