Bacterial Leaching of Refractory Gold-bearing Ore and Sulphide Concentrates PDF Download
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Author:
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ISBN:
Category :
Languages : en
Pages : 126
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Book Description
Author: Douglas E. Rawlings
Publisher: Springer Science & Business Media
ISBN: 3662061112
Category : Science
Languages : en
Pages : 302
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Book Description
Biomining is the use of microorganisms in the recovery of metals from ores. During bioleaching, metals such as copper, nickel or zinc are oxidized through microbial action from the water-insoluble sulfide to the soluble sulfate forms. Although gold is inert to microbial action, microbes can also be used in gold recovery from certain types of ores because as they oxidize the ore, they open up its structure, thereby allowing a gold-solubilizing agent such as cyanide to penetrate the ore. The book describes several industrial bioleaching and biooxidation processes as well as the underlying theory and biology of the microbes involved.
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Languages : en
Pages :
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This paper describes the bacterial leaching of a gold-bearing flotation concentrate consisting predominantly of pyrite in single-stage and multi-stage continuous reactor systems. The results of experiments under steady-state conditions are interpreted in terms of a logistic growth model, and the theory is shown to provide a useful basis for the design and scale-up of bacterial leach reactors. The results indicate that the critical dissolved oxygen concentration in the pulp may be as low as 0.1 mg/l.
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: 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: 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 Thompson Chapman
Publisher:
ISBN:
Category : Leaching
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
A mechanistic model is derived for the non-linear relationship between the release of gold and the percentage of sulphide oxidized during the bacterial leaching of mixed pyrite and arsenopyrite concentrates. The original ratio of pyrite to arsenopyrite, the ratio of the rate constants for their breakdown, and the distribution of gold between these two minerals are the parameters used for the fitting of curves to the experimental data. During bacterial leaching, cylindrical pores develop along weaknesses in the sulphide lattice, which are therefore preferred sites of bacterial corrosion. If the gold is in a particulate form and preferentially associated with such structural weaknesses, the release of gold occurs at an accelerated rate that does not conform to the numerical model.
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.
