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Author: Ditend Kanyik Tesh
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 0
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Book Description
"At Newcrest's Lihir operation, pyrite is the main gold-bearing mineral. Previous work has shown that gold is not evenly distributed in the pyrite mineral, with some pyrite types containing a relatively higher proportion of gold and some being virtually barren. The first objective of this project was to identify a methodology that allows the classification of pyrite into different populations reflecting their chemistry and gold content. The second objective was to break the ore using a variety of different breakage devices, to enhance the liberation of arsenian pyrite and upgrade the Au/S ratio. ... The results from this project suggest that the breakage device and the mineralogy of the ore are the key factors in determining how minerals break. One major contribution of this project is the measurement of Vickers Microhardness of pyrite and arsenian pyrite in the ore tested. Vickers Microhardness measurements indicate that arsenian pyrite is softer than pyrite, which contributed to its deportment into the finest size classes. This was a novel finding as it had not been conducted before. It is believed that this knowledge will contribute to the understanding of the breakage properties of the ore." - Abstract.
Author: Ditend Kanyik Tesh
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 0
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Book Description
"At Newcrest's Lihir operation, pyrite is the main gold-bearing mineral. Previous work has shown that gold is not evenly distributed in the pyrite mineral, with some pyrite types containing a relatively higher proportion of gold and some being virtually barren. The first objective of this project was to identify a methodology that allows the classification of pyrite into different populations reflecting their chemistry and gold content. The second objective was to break the ore using a variety of different breakage devices, to enhance the liberation of arsenian pyrite and upgrade the Au/S ratio. ... The results from this project suggest that the breakage device and the mineralogy of the ore are the key factors in determining how minerals break. One major contribution of this project is the measurement of Vickers Microhardness of pyrite and arsenian pyrite in the ore tested. Vickers Microhardness measurements indicate that arsenian pyrite is softer than pyrite, which contributed to its deportment into the finest size classes. This was a novel finding as it had not been conducted before. It is believed that this knowledge will contribute to the understanding of the breakage properties of the ore." - Abstract.
Author: Mike D. Adams
Publisher: Elsevier
ISBN: 0080459080
Category : Technology & Engineering
Languages : en
Pages : 1077
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Book Description
The gold processing industry is experiencing change. As free-milling and oxide ores become depleted, more complex polymetallic and refractory ores are being processed, coupled with increasing pressure for stricter environmental compliance. Recent years have also seen a steady reduction in mineral processing and metallurgy graduates and a gradual loss of older operating experience. A contribution to documenting current and future best practice in gold ore processing seems timely.The focus of this volume is on advances in current gold plant operation, from conception to closure; chapters also cover innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage. Sufficient coverage is also given to the chemistry and engineering aspects. The general principle behind the structure of the volume is that of flowsheeting based on unit operations and applied to a mineralogical classification of gold ore types. From concept to closure, this book covers all unit operations, mineralogies and processes that are relevant to dealing with today's complex orebodies.Practical experience is vital to the successful development, operation and closure of any operation. The 42 chapters have been contributed by a total of 66 authors and co-authors who are experts from countries spanning the globe, and representing exhaustive practical knowledge covering many disciplines relevant to gold processing.* Current best practice as elucidated by a select panel of experts in the field* Innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage* Mineralogical-based approach to flowsheeting
Author: H. W. Mcculloch
Publisher:
ISBN:
Category : Gold
Languages : en
Pages : 70
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Book Description
Author: John Marsden
Publisher: SME
ISBN: 9780873352406
Category : Science
Languages : en
Pages : 688
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Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The profitable recovery of gold, uranium, and other minerals from South African gold ores in the 1970s resulted in a trend towards flotation as a complementary process to cyanidation. This trend has been encouraged by the ever-decreasing ore grades that are being mined and treated. The decision to build a flotation plant often hinges on a number of factors, including a desire to improve the recovery of gold from the residue, to produce pyrite and sulphuric acid, to recover gold from plant calcines, and to reduce capital and treatment costs. On South African gold mines it is normal practice to float the gold and gold-bearing minerals since they constitute the smallest component of the ore. It is important to establish what the gold-bearing minerals are, as well as their proportion. The same information, ie, type and proportion, is required for the gangue minerals. It is of note in South Africa that certain gold-bearing minerals are themselves of economic importance. Pyrite, for example, is used in the production of sulphuric acid, uraninite for uranium, and arsenopyrite for arsenic production. It is important to distinguish between the reasons for using flotation in the treatment of the so-called 'free milling' Witwatersrand ores and the refractory gold ores from areas such as Barberton, Sabie, and Gravelotte. In the latter case, it is essential to float the gold-bearing sulphide minerals (pyrite, arsenopyrite and, in certain cases, stibnite) from the gangue since the sulphides have to be roasted prior to cyanidation for economic gold extraction to be obtained. Fine milling of the concentrate does not give satisfactory results; however, recent developments have indicated that pressure or bacterial oxidative leaching can be considered as alternatives to roasting. On the other hand, the flotation of sulphides and other gold-bearing minerals from the 'free milling ores' with subsequent treatment will either improve the gold recoveries, or allow for higher tonnage throughputs at the same gold recovery for virtually the same milling circuit, and only further grinding of the concentrate is required. The majority of the gold and gold-bearing minerals in Witwatersrand ores are liberated after milling to between 60 and 80 per cent smaller than 75 um. The liberated gold can generally be floated with most thiol-type collectors, as well as with certain cationic collectors. The predominant sulphide minerals present in Witwatersrand ores are pyrite, followed by pyrrhotite and, in small quantities, arsenopyrite, chalcopyrite, sphalerite, and cobaltite. At present all the flotation plants treating gold ores practise a policy of 'bulk' flotation, where an attempt is made to maximize the gold recovery by floating all the gold-bearing minerals. The flotation conditions adopted are usually those that favour high pyrite recovery. Fortunately, gold has been found to be as floatable as pyrite under the conditions applied in most gold mines. However, this is not the case for other gold-bearing minerals that can be floated (eg, uraninite). The process routes used on South African mines are of three types: that in which flotation takes place within the milling circuit or on the final classifier overflow product; that in which the current cyanidation residues are floated; that involving the flotation of old cyanidation residues. This paper, after discussing the above aspects, goes on to consider the chemical and physical parameters of importance in flotation, and details the flotation practices of five plants in South Africa. The design and control of flotation plants are then discussed.
Author: K.A. Natarajan
Publisher: Elsevier
ISBN: 0128040998
Category : Technology & Engineering
Languages : en
Pages : 504
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Book Description
Biotechnology of Metals: Principles, Recovery Methods and Environmental Concerns deals with all aspects of metal biotechnology in different areas, such as biogenesis, biomaterials, biomimetic strategies, biohydrometallurgy, mineral biobeneficiation, electrobioleaching, microbial corrosion, human implants, concrete biocorrosion, microbiology of environment pollution, and bioremediation. As the technology of this interdisciplinary science has diversified over the last five years, this book provides a valuable source for scientists and students in a number of disciplines, including geology, chemistry, metallurgy, microbiology, chemical engineering, environment, civil engineering, and biomedical engineering. - Offers comprehensive coverage of an interdisciplinary subject - Outlines the role of microbiology and biotechnology in mining, metallurgy, waste disposal and environmental control - Covers new topics, such as biogenesis, biomaterials processing, the role of micro-organisms in causing corrosion, and much more - Presents scientifically illustrated experimental research methods in metals biotechnology
Author: Mike D. Adams
Publisher: Elsevier
ISBN: 0444636706
Category : Science
Languages : en
Pages : 1050
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Book Description
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: John C. Yannopoulos
Publisher: Springer Science & Business Media
ISBN: 1468484257
Category : Technology & Engineering
Languages : en
Pages : 285
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Book Description
The history of gold begins in antiquity. Bits of gold were found in Spanish caves that were used by Paleolithic people around 40,000 B.C. Gold is the "child of Zeus," wrote the Greek poet Pindar. The Romans called the yellow metal aurum ("shining dawn"). Gold is the first element and first metal mentioned in the Bible, where it appears in more than 400 references. This book provides the most thorough and up-to-date information available on the extraction of gold from its ores, starting with the miner alogy of gold ores and ending with details of refining. Each chapter con cludes with a list of references including full publication information for all works cited. Sources preceded by an asterisk (*) are especially recom mended for more in-depth study. Nine appendices, helpful to both students and operators, complement the text. I have made every attempt to keep abreast of recent technical literature on the extraction of gold. Original publications through the spring of 1989 have been reviewed and cited where appropriate. This book is intended as a reference for operators, managers, and designers of gold mills and for professional prospectors. It is also designed as a textbook for extractive metallurgy courses. I am indebted to the Library of Engineering Societies in New York, which was the main source of the references in the book. The assistance of my son, Panos, in typing the manuscript is gratefully acknowledged.
Author: R. N. Guest
Publisher:
ISBN: 9780869995815
Category : Gold
Languages : en
Pages : 9
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Book Description
Author: Vaikuntam Iyer Lakshmanan
Publisher: Springer Nature
ISBN: 3030325490
Category : Technology & Engineering
Languages : en
Pages : 293
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Book Description
The book describes all aspects of technical innovation related to the gold and silver industries, from ore identification through to processing. It includes details of comminution, pre-concentration and beneficiation, commercially available and recently developed innovative pyro and hydrometallurgical processes, including leaching processes, separation and purification, and recovery and refining. The book focuses on capital and operating cost estimation, process simulation, waste remediation and minimization. Sustainable gold and silver processes are examined with the use of clean technologies and efficient use of energy and water. Topics such as supply and demand of gold and silver, their exchange in major global markets, and the factors that influence gold and silver prices and major economic indices are discussed. Presents emerging trends and innovations in the areas of ore body knowledge, mining, processing, waste management, economics, finance and automation; Describes emerging enablers for the gold and silver industries such as digitization, automation and remote operations; Promotes breakthroughs in mining, processing, waste management, energy and water from an integrated operations perspective.
