Download or read book The Absorption of Gold Cyanide Onto Activated Carbon 1 The Kinetics of Absorption from Pulps written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An account is given of the development of a relatively simple model that describes the kinetics of the absorption of gold cyanide on activated carbon. The model is based on the treatment of the carbon-solution interface as a homogeneous boundary across which gold is transported at a rate determined by the rate of mass transport to and from the interface. Rate equations derived from this model describe the results of various kinetic experiments under continuous or batch conditions in the laboratory and on operating pilot and full-scale plants.
Download or read book The Absorption of Gold Cyanide Onto Activated Carbon 2 Application of the Kinetic Model to Multistage Absorption Circuits written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A relatively simple rate equation for the kinetics of the absorption of gold from cyanide solutions onto activated carbon was used as the basis in the development of a model for multistage carbon-in-pulp and carbon-in-leach absorption circuits. The model was used in the prediction of both the steady-state and the transient behaviour of the absorption process, and the results were found to be in reasonable agreement with those observed in an extended pilot-plant campaign. A number of practical implications of the model are discussed, and an assessment is made of the economic consequences of the various process options available for the design of a carbon-in-pulp plant.
Download or read book The Absorption of Gold Cyanide Onto Activated Carbon 3 Factors Influencing the Rate of Loading and the Equilibrium Capacity written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results are reported of experiments on the influence of a number of variables on the rate of loading of gold cyanide onto activated carbon and the equilibrium capacity of the carbon. These variables include the concentrations of gold and free cyanide in solution, the pH value and ionic strength of the solution, the concentration of organic compounds in the solution, the temperature, the particle size of the carbon, and the mixing efficiency. The experiments were carried out under approximately steady-state conditions to simulate the conditions in a countercurrent carbon-in-pulp absorption plant. In addition, the results are reported of experiments to establish whether the absorption of gold cyanide onto activated carbon is a reversible process.
Download or read book Simulation of Carbon in pulp Circuits Based on the Kinetics of Gold Cyanide Adsorption on Activated Charcoal written by Roberto Zaragoza Mosqueda and published by . This book was released on 1982 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrometallurgy 2008 written by and published by SME. This book was released on 2008 with total page 1201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Comparison and Modelling of the Adsorption Kinetics of Gold Cyanide Onto Activated Carbon and Resin in a Silica Slurry written by Farouk Essop Ahmed and published by . This book was released on 1991 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Chemical Behaviour of Cyanide in the Extraction of Gold 1 Kinetics of Cyanide Loss in the Presence and Absence of Activated Carbon written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The kinetics of cyanide loss were found to be first order under any given set of conditions, allowing rate constants to be easily determined. At room temperature and in the absence of activated carbon, some cyanide is lost by hydrolysis to hydrogen cyanide, but this does not occur to any significant extent at pH values higher than about 10. A higher rate of hydrolysis occurs when air-agitation is used. When activated carbon is present, an additional carbon-catalysed oxidation reaction is responsible for a fairly high loss of cyanide. The evidence indicates a reaction mechanism that consumes oxygen and produces cyanate ion. Some of the cyanate thus produced decomposes to form a mixture of ammonia, carbonate, and urea, depending on the solution conditions. Additional cyanide is lost as a result of the adsorption of sodium cyanide by the activated carbon. At high temperatures, an additional hydrolysis reaction, which involves the formation of ammonium formate as an intermediate, occurs and is responsible for a high loss of cyanide, leading ultimately to the formation of ammonia, hydrogen, and carbon dioxide. The presence of activated carbon has no effect on the rate of this reaction.
Download or read book Effect of Metal Impurities on the Adsorption of Gold by Activated Carbon in Cyanide Solutions written by S. A. N. Sheya and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon in pulp Gold Adsorption from Cyanide Leach Slurries written by Stuart J. Hussey and published by . This book was released on 1979 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Optimization of a Carbon in pulp Adsorption Circuit Based on the Kinetics of Extraction of Aurocyanide by Activated Carbon written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the carbon-in-pulp (CIP) process for the recovery of gold from cyanide solutions is now well established, there is little fundamental understanding of the factors influencing the optimum performance of the adsorption circuit. Therefore, in the past, a trial-and-error procedure was generally adopted so that the twin goals of the process could be attained, namely carbon loadings with high gold concentrations and tailings with low concentrations of gold. If it is assumed that the head solution, the tailings solution, and the final carbon loading are fixed process requirements, then the basic process variables are the carbon concentration in each stage and the flow-rates of the carbon and the pulp from stage to stage. The factor that determines how these parameters can be varied to the best advantage is the rate of gold extraction in each stage. In this paper it is shown that these quantities can be calculated for any set of fixed process requirements and for any number of stages in the circuit. The calculations are based on an empirical rate of expression obtained from experiments carried out on a CIP pilot plant.
Download or read book Effect of Metal Impurities on Absorption of Gold by Activated Carbon in Cyanide Solutions written by S. A. N.. Sheya and published by . This book was released on 1989 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Erkl rung des Heidelbergischen Katechismus written by and published by . This book was released on 1806 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extractive Metallurgy Symposium written by and published by . This book was released on 1984 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Chemistry of Gold Extraction written by John Marsden and published by SME. This book was released on 2006 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensively revised and updated, this edition provides the broad base of knowledge required by all working in the gold extraction and gold processing industries. It bridges the gap between research and industry by emphasizing practical applications of chemical principles and techniques.
Download or read book The Mechanism of the Adsorption of Gold Cyanide on Activated Carbon written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray photoelectron spectroscopy showed that the adsorption of gold cyanide on carbon in the presence or absence of electrolytes and acids proceeds by the same mechanism. Although the identity of the gold cyanide adsorbate is not known, the mechanism appears to have an initial adsorption stage that involves the adsorption of an ion pair: M(n+)[Au(CN)2(-)]n, where M(n+) is a metal ion (for example Na+, K+ and Ca(2+) that has a lower solubility than the Au(CN)2(-) anion in the adsorption medium, followed by a reduction step in which either a sub-stoichiometric Au(CN)x surface species or a cluster-type compound of gold is formed.
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 1990 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Electrochemical Mechanisms for the Adsorption of Gold Cyanide on Activated Carbon written by Warren Glen Jones and published by . This book was released on 1993 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
