Download or read book The Flotation of Gold and Pyrite from South African Gold mine Residues written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: At present there are some nineteen flotation plants treating gold-bearing material in South Africa. In some plants, flotation is an integral part of the main process for gold recovery whereas, in others, old dump material or tailings from current ore is treated. In this paper, a brief general survey of flotation plants on gold mines is presented, and then the results of an investigation into the flotation behaviour of gold and pyrite on several selected plants for the retreatment of dumps and of plants for the treatment of tailings from current ore. The intimate association of gold with pyrite made it necessary for the flotation of these minerals to be studied simultaneously. From the size and chemical analysis of the sample material collected from five plants, the following conclusions can be drawn. 1. The gold recovery in the fine size range (smaller than 12 um) can be as high as 80 per cent in those plants treating milled ore. Low gold recoveries in this size range for plants treating tailings can be attributed to the smaller percentage of free gold present, as well as to the presence of fine pyrophyllite in certain plants. 2. The presence of fine pyrophyllite in flotation feeds inhibits the rate of flotation of gold and pyrite. 3. The addition of copper sulphate and a depressant in the flotation of dumps that contain pyrophyllite results in an increased rate of flotation of pyrite, this leading also to improved gold recovery. This result has been substantiated in the laboratory. 4. The rate of gold and pyrite flotation is greater from plants treating coarse milled ore than from plants treating tailings. Consequently, shorter flotation residence times (ie, less total cell volume), and fewer cleaning stages, are required for coarsely milled flotation feeds. 5. Amine collectors can be as effective as xanthate collectors for the recovery of gold and pyrite in alkaline circuits with pH values higher than 10 for coarse-size feeds. An amine collector has the advantage that it does not inhibit the leaching of gold with cyanide as does a xanthate collector. 6. The sulphur limitations on flotation concentrates from gold flotation plants restrict the gold recovery. Lowering of the grade would result in improved gold recoveries in the fine and coarse sizes. Attempts to improve gold recovery on all the gold flotation plants continue; however, there are two areas that need more immediate attention. Firstly, the improved recovery of fine gold, especially from flotation plants using old tailings as feed, need to be considered more thoroughly and, secondly, the design of fluidized-bed roasters to accept lower sulphur concentrates should also be considered. (AUCON).
Download or read book The Recovery of Pyrite and Gold from Acid leach Residues from the Merriespruit Gold Mine written by and published by . This book was released on 1984 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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
Download or read book The Recovery of Pyrite and Gold from Acid leach Residues from the Merriespruit Gold Mine written by Peter William Overbeek and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gold Metallurgy and the Environment written by Sadia Ilyas and published by CRC Press. This book was released on 2018-02-19 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives an overview of all the gold extraction processes along with their mechanistic study and environmental impact. Reviews extraction techniques previously employed as well as recently evolved technology for gold leaching, provides technical flow sheets for processing of ores with a diversity of lixiviants and offers a compulsory overview of every gold processing technique It also discusses recent integrated techniques including hydro- and bio-metallurgical techniques with examples
Download or read book The Recovery of Pyrite and Gold from Acid leach Residues from the Merriespruit Gold Mine written by PW. Overbeek and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Batch flotation tests on acid-leach residue from Merriespruit Gold Mine showed that concentrate grades of up to 40 per cent sulphur can be readily obtained, although at low recoveries. Flotation tests at the pilot plant gave better results than did the batch tests. The initial results showed that 76 per cent of the sulphur content of the feed can be recovered in a concentrate that assays 47,0 per cent sulphur. Attempts to improve the recovery at the expense of the grade were not successful, the highest recovery obtained being 79,7 per cent at a concentrate grade of 36,8 per cent sulphur. The gold recovery at that stage was 47,2 per cent. A gradual deterioration in flotation response was noted as the tests progressed, and this was attributed to possible deterioration of the feed material due to oxidation. However, this was not proved conclusively. It was concluded that, by use of the flotation conditions recommended by the sponsor, the required grade of 38 per cent sulphur could be readily obtained at recoveries of more than 75 per cent of the sulphur present in the feed material. In a second phase of the project, cyanidation tests were carried out on roasted and unroasted flotation concentrates produced in the pilot plant. The average gold extraction for the roasted material was 68 per cent. Additions of lime were found to be important, and an excess of lime resulted in lower gold extractions. The extraction of gold from unroasted material was not as successful as from the roasted material. The maximum recovery from unroasted material after fine grinding was 63 per cent. The consumption of lime was high in all these tests, and 22 kg of lime per ton of concentrate was used for the test in which the maximum gold extraction was obtained. Finally, settling tests were carried out on tailings so that the settling characteristics in an acid medium could be established. It was found that, in the pH range 3,5 to 4,5, the settling rate was two to three times lower than it had been as a pH range 3,5 to 4,5, the settling rate was two to three times lower than it had been at a pH value of 11,0.
Download or read book The Flotation of Pyrite from Buffelsfontein Gold Mine written by and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the investigation was the reduction of the losses of gold and pyrite in the flotation plant at Buffelsfontein Gold Mine. Laboratory-scale batch tests showed that the recovery of pyrite is decreased in the presence of sulphates of magnesium, calcium, and iron, or in the presence of cyanide if copper sulphate is absent. The recoveries are increased with increased conditioning times and residence times. Both the grade of concentrate and the rate of flotation are influenced by the temperature of the pulp, and conditioning with sulphur dioxide is beneficial. The grade of the concentrate is influenced by the dosage of collector. The present dosage of 100 g/t is satisfactory. Various methods for the oxidation of residual cyanide were tested. Alkaline flotation after the oxidation of cyanide by chlorination and by sodium sulphite and air yielded similar recoveries to the standard acid flotation, but the sulphur grade of the concentrate was lower. The relationship between residence time and flotation performance was quantified. The results of laboratory batch tests were scaled up and used in a computer simulation of the flotation circuit. The recycling of the recleaner tailings to the head of the rougher bank would increase the recoveries of gold and sulphur by 8 and 10,4 per cent respectively. The recoveries could be further increased by increased residence times.
Download or read book Gold Ore Processing written by Mike D. Adams and published by Elsevier. This book was released on 2016-05-03 with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Journal of the South African Institute of Mining and Metallurgy written by South African Institute of Mining and Metallurgy and published by . This book was released on 1987 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Flotation of Pyrite from Buffelsfontein Gold Mine written by Ana Maria Ribeiro Botelho de Sousa and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Chemistry of Gold Extraction written by John Marsden and published by SME. This book was released on 2006 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Recovery of Gold and Pyrite from a Residue Dump at Crown Mines written by W. Keleghan and published by . This book was released on 1976 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Flotation of Pyrite from Siliceous Gangue by Cationic Collectors written by K. G. Ashurst and published by . This book was released on 1968 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Journal of the Chemical Metallurgical and Mining Society of South Africa written by Chemical, Metallurgical, and Mining Society of South Africa and published by . This book was released on 1921 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CIM Bulletin written by Canadian Institute of Mining and Metallurgy and published by . This book was released on 1999 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Journal of the Chemical Metallurgical Mining Society of South Africa written by and published by . This book was released on 1926 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the XVI International Mineral Processing Congress written by K. S. Eric Forsberg and published by . This book was released on 1988 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
