Some Recent Developments In The Extraction Metallurgy Of Gold In South Africa PDF Download
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Total Pages | : |
Release | : 1980 |
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Download Some Recent Developments in the Extraction Metallurgy of Gold in South Africa Book in PDF, ePub and Kindle
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.
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Release | : 1978 |
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Download Recent Advances in the Extractive Metallurgy of Gold Book in PDF, ePub and Kindle
Author | : G. G. Stanley |
Publisher | : |
Total Pages | : 674 |
Release | : 1987 |
Genre | : Gold |
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Download The Extractive Metallurgy of Gold in South Africa Book in PDF, ePub and Kindle
Author | : G. G. Stanley |
Publisher | : |
Total Pages | : |
Release | : 1987 |
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Download Extractive Metallurgy of Gold in South Africa Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : |
Release | : 1980 |
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Download Carbon and the Recovery of Gold : Some Recent Developments by the National Institute for Metallurgy Book in PDF, ePub and Kindle
This paper describes some aspects of NIM's recent progress in the extraction of gold.
Author | : G. G. Stanley |
Publisher | : |
Total Pages | : 554 |
Release | : 1987 |
Genre | : Gold |
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Download The Extractive Metallurgy of Gold in South Africa Book in PDF, ePub and Kindle
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Release | : 1980 |
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Download Highlights of Current Metallurgical Research and Development in the South African Precious-metals and Ferro-alloy Industries Book in PDF, ePub and Kindle
Some of the current research-and-development programmes in South Africa are reviewed, including those involving the extraction metallurgy of gold, uranium, ferrochromium, ferromanganese, and the platinum-group metals, and the transfer of technology to the industry. The motivation for such research and development is the reduction of capital and operating costs, the improvement of existing processes by computer-assisted control and optimization, the development of new processes for ores not previously exploited, the optimization of energy consumption, and the further processing of minerals to intermediate and end products. In a country with a limited amount of highly-trained manpower, the optimization of metallurgical research and development has to be based on good technical interaction between the mining and metallurgical industries and their in-house laboratories on the one hand, and the national laboratories on the other. In addition, the successful transfer of technology from the research-and-development phase to industry is essential. The examples quoted demonstrate that the local metallurgical industry is supported by a vigorous research-and-development effort that should generate confidence in South Africa's continued large-scale supply of raw and processed mineral products at competitive prices.
Author | : G. G. Stanley |
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Total Pages | : |
Release | : 1987 |
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Download Extractive Metallurgy of Gold in South Africa Book in PDF, ePub and Kindle
Author | : John C. Yannopoulos |
Publisher | : Springer Science & Business Media |
Total Pages | : 285 |
Release | : 2012-12-06 |
Genre | : Technology & Engineering |
ISBN | : 1468484257 |
Download The Extractive Metallurgy of Gold Book in PDF, ePub and Kindle
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 | : D. E. R. Ayres |
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Total Pages | : 474 |
Release | : 1972 |
Genre | : Technology & Engineering |
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Download Gold Metallurgy in South Africa Book in PDF, ePub and Kindle