Download or read book Kinetic Analysis of Leaching Reactions in Multi component Mineral Systems written by Thomas Charles Close (Jr.) and published by . This book was released on 2021 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rational design of reactive systems requires the use of kinetic models of system behavior. However, the development of such models for multicomponent systems is complicated by conditions of mutual interference in determining reaction rates. Addressing this shortcoming for mineral systems requires developing methods to solve the fundamental problem of identity and resolve the partitioning of system behavior between components. In this work a complete description of the problem of simultaneous rate determination under conditions of mutual interference is developed and progress towards solving this problem in microfluidic and bulk systems is presented. Results show that there are unique challenges posed in microfluidic systems that hinder the ability to accurately partition the behavior of the total system between its constituents. In contrast, the bulk system permits a practical experimental solution based on particle size and shape for certain classes of solid mixtures.
Download or read book Leaching Kinetics of Valuable Metals written by Stefano Ubaldini and published by MDPI. This book was released on 2021-05-07 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leaching is a primary extractive operation in hydrometallurgical processing, by which a metal of interest is transferred from naturally occurring minerals into an aqueous solution. In essence, it involves the selective dissolution of valuable minerals, where the ore, concentrate, or matte is brought into contact with an active chemical solution known as a leach solution. Currently, the hydrometallurgical processes have a great number of applications, not only in the mining sector—in particular, for the recovery of precious metals—but also in the environmental sector, for the recovery of toxic metals from wastes of various types, and their reuse as valuable metals, after purification. Therefore, there is an increasing need to develop novel solutions, to implement environmentally sustainable practices in the recovery of these valuable and precious metals, with particular reference to critical metals; those included in materials that are indispensable to modern life and for which an exponential increase in consumption is already a reality, or will be in a short-term perspective. For publication in this Special Issue, consideration has been given to articles that contribute to the optimization of the kinetic conditions of innovative hydrometallurgical processes—economic and of low environmental impact—applied to the recovery of valuable and critical metals.
Download or read book Kinetics and Equilibrium in Mineral Reactions written by S.K. Saxena and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions by numerous experts
Download or read book A Mixed Kinetics Dump Leaching Model for Ores Containing a Variety of Copper Sulfide Minerals written by Brent W. Madsen and published by . This book was released on 1981 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Reactions and Kinetics in Leaching of Complex Polysulphide Minerals written by Crispulo C. Sideco and published by . This book was released on 1962 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Leaching Kinetics of Valuable Metals written by Stefano Ubaldini and published by . This book was released on 2021 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leaching is a primary extractive operation in hydrometallurgical processing, by which a metal of interest is transferred from naturally occurring minerals into an aqueous solution. In essence, it involves the selective dissolution of valuable minerals, where the ore, concentrate, or matte is brought into contact with an active chemical solution known as a leach solution. Currently, the hydrometallurgical processes have a great number of applications, not only in the mining sector--in particular, for the recovery of precious metals--but also in the environmental sector, for the recovery of toxic metals from wastes of various types, and their reuse as valuable metals, after purification. Therefore, there is an increasing need to develop novel solutions, to implement environmentally sustainable practices in the recovery of these valuable and precious metals, with particular reference to critical metals; those included in materials that are indispensable to modern life and for which an exponential increase in consumption is already a reality, or will be in a short-term perspective. For publication in this Special Issue, consideration has been given to articles that contribute to the optimization of the kinetic conditions of innovative hydrometallurgical processes--economic and of low environmental impact--applied to the recovery of valuable and critical metals.
Download or read book Leaching and Reduction in Hydrometallurgy written by Alfred Richard Burkin and published by . This book was released on 1975 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Introduction to Chemical Kinetics written by Michel Soustelle and published by John Wiley & Sons. This book was released on 2013-02-07 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a progressive presentation of kinetics of the chemical reactions. It provides complete coverage of the domain of chemical kinetics, which is necessary for the various future users in the fields of Chemistry, Physical Chemistry, Materials Science, Chemical Engineering, Macromolecular Chemistry and Combustion. It will help them to understand the most sophisticated knowledge of their future job area. Over 15 chapters, this book present the fundamentals of chemical kinetics, its relations with reaction mechanisms and kinetic properties. Two chapters are then devoted to experimental results and how to calculate the kinetic laws in both homogeneous and heterogeneous systems. The following two chapters describe the main approximation modes to calculate these laws. Three chapters are devoted to elementary steps with the various classes, the principles used to write them and their modeling using the theory of the activated complex in gas and condensed phases. Three chapters are devoted to the particular areas of chemical reactions, chain reactions, catalysis and the stoichiometric heterogeneous reactions. Finally the non-steady-state processes of combustion and explosion are treated in the final chapter.
Download or read book Solution Mining written by Robert Bartlett and published by Routledge. This book was released on 2013-10-28 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: First published in 1998. This book offers a wealth of information on the rapidly expanding field of solution mining: yhe extraction of materials from the earth by leaching and fluid recovery. This is an introductory text for students and professional engineers that is comprehensive and emphases current practice and theory. Percolation leaching of fragmented ground is covered, as well as true and modified in situ teaching. Solution mining of gold, copper and uranium ores, several slats extracted from evaporates and brines, and sulfur are discussed. Mineral teaching chemistry and kinetics, hydrology (including flow equations for various wellfields and other fluid recovery systems), environmental containment and solution mining simulation models are also included.
Download or read book Chemical Reactor Design written by Peter Harriott and published by CRC Press. This book was released on 2002-11-06 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Featuring case studies and worked examples that illustrate key concepts in the text, this book contains guidelines for scaleup of laboratory and pilot plant results, methods to derive the correct reaction order, activation energy, or kinetic model from laboratory tests, and theories, correlations, and practical examples for 2- and 3-phase reaction
Download or read book Optimization and Kinetic Analysis of Direct Alkali Leaching of Silica from Vanadium Bearing Shale Leaching Residue written by Xuanxiong Kang and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Response Surface Methodology was employed to optimize the leaching parameters for SiO2 during NaOH alkaline leaching from vanadium acid leaching residues. The kinetic aspect of the process was also investigated. The results illustrate that each factor positively influences the SiO2 leaching rate, with the significance of these factors ranking as follows: leaching temperature > alkali residue mass ratio > leaching duration. Under these optimal circumstances, the SiO2 leaching rate can attain a value as high as 95.55%. A kinetic examination of the alkaline leaching process implies that the reaction process is predominantly governed by internal diffusion. The apparent activation energy of the reaction is 11.44 kJ·mol-1. The kinetic equation is: [[EQUATION]],and the reaction order of NaOH is 0.69294.
Download or read book Hydrometallurgy written by Michael Free and published by John Wiley & Sons. This book was released on 2013-10-07 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book provides a college-level overview of chemical processing of metals in water-based solutions, in the field that is known as hydrometallurgy"--
Download or read book Coupled Thermo Hydro Mechanical Chemical Processes in Geo systems written by Ove Stephansson and published by Elsevier. This book was released on 2004-11-03 with total page 853 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the most important and exciting current steps forward in geo-engineering is the development of coupled numerical models. They represent the basic physics of geo-engineering processes which can include the effects of heat, water, mechanics and chemistry. Such models provide an integrating focus for the wide range of geo-engineering disciplines. The articles within this volume were originally presented at the inaugural GeoProc conference held in Stockholm and contain a collection of unusually high quality information not available elsewhere in an edited and coherent form. This collection not only benefits from the latest theoretical developments but also applies them to a number of practical and wide ranging applications. Examples include the environmental issues around radioactive waste disposal deep in rock, and the search for new reserves of oil and gas.
Download or read book Hydrometallurgy written by T Havlik and published by Elsevier. This book was released on 2014-01-23 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is concerned with the theoretical principles of hydrometallurgical processes and engineering aspects. The hydrometallurgical processes of production of copper are discussed and leaching of chalcopyrite as the main sulphide mineral of copper processed in industry is used as an example. The book is suitable as a university textbook for students of metallurgy. Examines the different techniques involved Discusses the production of specific metals using hydrometalluric processes Looks at the future of hydrometallurgy
Download or read book Chemical Reactor Design and Control written by William L. Luyben and published by John Wiley & Sons. This book was released on 2007-07-16 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical Reactor Design and Control uses process simulators like Matlab®, Aspen Plus, and Aspen Dynamics to study the design of chemical reactors and their dynamic control. There are numerous books that focus on steady-state reactor design. There are no books that consider practical control systems for real industrial reactors. This unique reference addresses the simultaneous design and control of chemical reactors. After a discussion of reactor basics, it: Covers three types of classical reactors: continuous stirred tank (CSTR), batch, and tubular plug flow Emphasizes temperature control and the critical impact of steady-state design on the dynamics and stability of reactors Covers chemical reactors and control problems in a plantwide environment Incorporates numerous tables and shows step-by-step calculations with equations Discusses how to use process simulators to address diverse issues and types of operations This is a practical reference for chemical engineering professionals in the process industries, professionals who work with chemical reactors, and students in undergraduate and graduate reactor design, process control, and plant design courses.
Download or read book In place Leaching of Primary Sulfide Ores written by and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: From AIME solution mining symposinm; Dallas, Texas, USA (Feb 1974). Experimental results obtained in laboratory leaching studies of primary copper sulfide ore in sulfuric acid systems pressurized with oxygen are interpreted by a computerized geometric model involving the movement of a reaction zone through the ore fragments. Physical properties of the ore, including size, shape, and mineral content, are considered. The leaching mechanism involves mixed kinetics and includes a surface reaction within a moving reaction zone plus pore diffusion of dissolved oxygen through the reacted portion of the ore fragment to the reaction zone, The results are applicable to conditions that would exist in nuclear solution mining or simiIar processes in which the ore is converted into rubble and then inundated by a leach solution adequately supplied with oxidants. Experimental results at 90 deg C are correlated with the model, which includes temperature-dependent parameters. (auth).
Download or read book Mineral water Interfacial Reactions written by Donald L. Sparks and published by . This book was released on 1998 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Clearly explains how to more effectively decipher and predict contaminant fate in the environment by combining kinetic methods and molecular-scale spectroscopic and microscopic techniques to analyze mineral/water interfacial reactions in situ. The book begins with a broad overview, then continues with three sections written by internationally known expert. The first deals specifically with spectroscopic/microscopic techniques that can be used in combination with macroscopic approaches to glean mechanistic information on mineral/water reactions and processes. The second section emphasizes computer models that are used to elucidate surface mediated reaction mechanisms. The remainder of the volume is organized around reaction type, including sorption/desorption of inorganic species, sorption/desorption of organic species, precipitation/dissolution processes, heterogeneous electron transfer reactions, photochemically driven reactions, and microbially mediated reactions. Mineral-Water Interfacial Reactions will be a valuable resource for environmental scientists, geochemists, soil chemists, microbiologists, and marine engineers who need to be familiar with the most current and effective methods for testing and controlling the mobility, speciation, and bioavailability of contaminants in the environment.
