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Author : P. A. Laxen
Publisher :
ISBN 13 : 9780869992029
Total Pages : 10 pages
Book Rating : 4.9/5 (92 download)
Download or read book Some Developments in the Extraction of Gold from Witwatersrand Ores written by P. A. Laxen and published by . This book was released on 1975 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (921 download)
Download or read book Some Developments in Gold Extraction from Witwatersrand Ores written by and published by . This book was released on 1975 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The extraction of gold from most ores of the Witwatersrand has been consistently high - approximately 95 per cent - for many years. The present high price of gold has stimulated research and development into potential improvements of the standard procedures. The occurrence of the gold and its association with other minerals is described briefly. The Witwatersrand reefs also contain uranium and pyrite, and some of the improvements to the standard gold-extraction process are associated with the recovery or concentration of one or both of these valuable constituents. For instance, the 'reverse-leach' process - in which acid treatment for the extraction of uranium precedes cyanidation - results in improved gold extraction. Some concentration techniques used on the present residues from cyanidation offer promise in improving the overall gold recoveries. Thucholite is an important carrier of residual gold, and its recovery from some residues by flotation appears to be economically justifiable. Wet high-intensity magnetic separation has given promising results in the laboratory and on a pilot plant for the recovery of both uranium and gold from a number of cyanide tailings. The benefits of gravity concentration and of the application of empirical modelling to the gold-extraction process have been demonstrated by a mining group. Some developments in instrumentation for control during cyanidation are discussed briefly.
Download or read book Developments in the Extraction of Gold from Witwatersrand Ores written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An account is given of the developments that have taken place in the extraction of gold from Witwatersrand ores. They are attributed to the introduction of processes for the extraction of the small amounts of uranium present in the ores; to the advances in technology resulting from scientific studies of the processes involved; and to recent sharp increases in the gold price and in working costs. Processing for uranium extraction has encouraged the use of separate high-grade and low-grade circuits, and of a 'reverse-leach' process in which acid leaching for the dissolution of uranium precedes cyanidation. Uranium extraction has also created a market for pyrite, which is used for the manufacture of sulphuric acid. The ways in which these factors benefit the extraction of gold are explained. Scientific studies and advances in technology have led, among other developments, to: an increased use of run-of-mine milling; the introduction of the carbon-in-pulp process for the adsorption of gold and electrolytic recovery of the eluted gold; the design of a wet high-intensity magnetic separator that is free from blockage by wood pulp for the recovery of gold and uranium in cyanidation residues; the development of a multi-variable mill-control system; techniques for the treatment of gravity concentrates other than amalgamation; a centrifugal mill for underground milling; and the production of gold of high purity by electrorefining. The increased price of gold has made the re-treatment of cyanidation residues profitable, and various processes have been developed for this purpose. Similarly, the higher capital and operating costs have encouraged simpler, more economical flowsheets, which involve large items of equipment and automatic sorting methods.
Download or read book Established Procedures and New Advances in the Extraction of Gold, Uranium, and Pyrite from Witwatersrand Ores written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution of basic industrial circuits for the extraction of gold, uranium, and pyrite from Witwatersrand (WWR) ores is described. Special emphasis is placed on the influence of the mineralogical composition of the ore on the choice of the various circuits that have been used for the treatment of the three major types of WWR ore: banket, carbon seam, and pyritic quartzite. The impact of recent developments in the processing of WWR ores on the basic metallurgical circuits and possible future trends in the extractive metallurgy of WWR ores are discussed.
Download or read book Some Recent Developments in the Extraction Metallurgy of Gold in South Africa written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The South African gold industry is approximately one hundred years old, and is still characterized by a dynamic spirit of research and innovation. With the apparently inexorable rise in the price of gold, even minor improvements in recovery or reductions in operating costs have major economic significance. Recent advances in metallurgical research and development include the following: (i) An electrochemical explanation for the gold-cementation process. This indicates why such large amounts of zinc - some twenty times the stoichiometric requirement - together with lead nitrate are necessary for the almost complete precipitation of gold from cyanide solution. (ii) Application of the carbon-in-pulp process to the direct extraction of dissolved gold from cyanidation pulps. Novel features include a technique for retaining the loaded granules of activated carbon against the pulp flow, a new technique for subsequent stripping of the gold from the carbon, and the development of a packed-bed electrode cell for electrowinning of the gold from the eluate. A solution to the problem of clogging in the ball matrix of wet high-intensity magnetic separators used for the beneficiation of Witwatersrand uranium-and-gold-bearing residues. The balls, which are in a carousel, are removed continuously through a side discharge, are cleaned, and are returned to the separator. (iv) The development of a powerful but compact centrifugal mill for the underground milling of Witwatersrand ores in deep mines so that the milled product can be concentrated and then pumped to the surface, the discard material being used as backfill in the excavation. The anticipated reduction in the amount of energy required to hoist low-grade ores through thousands of metres, together with a reduction in ventilation and supporting structures, promises to extend the lives of mines that have become too deep to be exploited economically with existing technology. (v) The large-scale reclamation of gold from tailings dumps. One example involves the retreatment of several mine dumps many kilometres apart at a central processing plant - the Ergo project. Apart from a plant handling 2100 tons of dump material per hour, housing 156 flotation cells (the majority of which are 14 000 litres in volume) and three tailings-thickener tanks each 138 metres in diameter, the production and transportation of the pulp is an impressive exercise.
Author : United States. Energy Research and Development Administration. Technical Information Center
Publisher :
ISBN 13 :
Total Pages : 1682 pages
Book Rating : 4.3/5 (129 download)
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 1682 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. Energy Research and Development Administration
Publisher :
ISBN 13 :
Total Pages : 646 pages
Book Rating : 4.:/5 (319 download)
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 752 pages
Book Rating : 4.:/5 (3 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Claudia Gasparrini
Publisher : Springer Science & Business Media
ISBN 13 : 364277184X
Total Pages : 348 pages
Book Rating : 4.6/5 (427 download)
Download or read book Gold and Other Precious Metals written by Claudia Gasparrini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: A view of gold and other precious metal extractions from a new and wider angle, taking in both the earth and the metallurgical sciences. To name but a small number of the topics covered: - Occurrences of gold and silver minerals in their ores - Photomicrographs of refractory and amenable minerals/ores - The use of irregular gold and silver distributions for efficient planning of the extraction process - Microanalytical techniques - Descriptions of uranium and many base metals for comparison. Written with a broad audience in mind, from the manager of operations to the metallurgist, for the field geologist or other earth scientist, and for the professor and student alike.
Author : Mike D. Adams
Publisher : Elsevier
ISBN 13 : 0080459080
Total Pages : 1077 pages
Book Rating : 4.0/5 (84 download)
Download or read book Advances in Gold Ore Processing written by Mike D. Adams and published by Elsevier. This book was released on 2005-12-02 with total page 1077 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : M.I. El Guindy
Publisher : Elsevier
ISBN 13 : 1483189481
Total Pages : 672 pages
Book Rating : 4.4/5 (831 download)
Download or read book Precious Metals 1982 written by M.I. El Guindy and published by Elsevier. This book was released on 2013-10-22 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precious Metals 1982 presents the variety of technical innovations in the application of precious metals. This book discusses the advances in recovery and refining and analysis of precious metals. Organized into 10 parts encompassing 47 chapters, this book begins with an overview of the fundamental experiments to elicit the mode of solidification for a small casting using the investment casting method. This text then describes the various medical uses of silver and its salts with the antibacterial properties of silver ions used in burn therapy, water purification, and to prevent infections. Other chapters consider the practical feasibility of a process involving the reaction of oxygen with gold particles in a potassium cyanide solution to produce potassium gold cyanide. This book discusses as well the major catalytic applications of the precious metals. The final chapter deals with fraud involving gold. This book is a valuable resource for engineers, metallurgists, geologists, jewelers, and goldsmiths.
Author :
Publisher :
ISBN 13 :
Total Pages : 642 pages
Book Rating : 4.:/5 (334 download)
Download or read book Information Circular written by and published by . This book was released on 1983 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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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 : Peter G. Chamberlain
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.3/5 (91 download)
Download or read book Gold and Silver Leaching Practices in the United States written by Peter G. Chamberlain and published by . This book was released on 1984 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. R. F. Handley
Publisher :
ISBN 13 :
Total Pages : 248 pages
Book Rating : 4.F/5 ( download)
Download or read book Historic Overview of the Witwatersrand Goldfields written by J. R. F. Handley and published by . This book was released on 2004 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 818 pages
Book Rating : 4.2/5 (849 download)
Download or read book The Encyclopaedia Britannica written by and published by . This book was released on 1902 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. Congress. House. Committee on Science and Technology
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.3/5 (121 download)
Download or read book Oversight of Energy Development in Africa and the Middle East written by United States. Congress. House. Committee on Science and Technology and published by . This book was released on 1980 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
