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Some Recent Developments In The Extraction Metallurgy Of Gold In South Africa

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Some Recent Developments In The Extraction Metallurgy Of Gold In South Africa

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Author :
language : en
Publisher:
Release Date : 1980

Some Recent Developments In The Extraction Metallurgy Of Gold In South Africa written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.

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.

Gold

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Author : Nathaniel Arbiter
language : en
Publisher: CRC Press
Release Date : 1990

Gold written by Nathaniel Arbiter and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Business & Economics categories.

The eight articles first appeared as volume 6 (no date) of Mineral processing and extractive metallurgy review. They review new methods of recovery for gold, and to some extent, silver, focus on the particular challenges of extraction from carbonaceous ores and from various sulfide-bearing ore, and the treatment of refractory gold ore, and discuss high-temperature and biological oxidation, high- temperature chlorination, and removing metals from leach liquor. Book club price, $40. Annotation copyrighted by Book News, Inc., Portland, OR

Recent Advances In The Extractive Metallurgy Of Gold

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Author :
language : en
Publisher:
Release Date : 1978

Recent Advances In The Extractive Metallurgy Of Gold written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.

The Extractive Metallurgy Of Gold In South Africa

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Author : G. G. Stanley
language : en
Publisher:
Release Date : 1987

The Extractive Metallurgy Of Gold In South Africa written by G. G. Stanley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Gold categories.

Extractive Metallurgy Of Gold In South Africa

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Author : G. G. Stanley
language : en
Publisher:
Release Date : 1987

Extractive Metallurgy Of Gold In South Africa written by G. G. Stanley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.

Highlights Of Current Metallurgical Research And Development In The South African Precious Metals And Ferro Alloy Industries

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Author :
language : en
Publisher:
Release Date : 1980

Highlights Of Current Metallurgical Research And Development In The South African Precious Metals And Ferro Alloy Industries written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.

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.

New Developments In The Extractive Metallurgy Industry

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Author : South African Institute of Mining and Metallurgy
language : en
Publisher:
Release Date : 1996

New Developments In The Extractive Metallurgy Industry written by South African Institute of Mining and Metallurgy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Metallurgy categories.