Download or read book A Review of the AARL Process for the Elution of Gold from Activated Carbon written by and published by . This book was released on with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Kinetics of the Elution of Gold from Activated Carbon by the Zadra Method written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The kinetic model developed previously for the elution of aurocyanide from activated carbon is shown to successfully predict the efficiency of gold elution by the Zadra procedure. Laboratory-scale data, which were obtained from elutions involving fixed-bed columns and gold extraction in a simulated electrowinning cell, are interpreted in terms of the model. Several chemical influences on the efficiency of the Zadra elution process that have hitherto not received attention, are also discussed. The washing of loaded carbon with acid prior to elution and the decomposition of cyanide during elution are shown to have deleterious effects on the elution rate under certain conditions. It is suggested that the employment of concentrations of cyanide that are lower by a factor of ten (about 0.05 per cent NaCN, ie, 0.01 M) than those used in typical Zadra operations (about 0.5 per cent NaCN, ie, 0.1 M) would not noticeably affect the elution kinetics, but would reduce reagent consumption significantly. However, the use of higher concentrations of cyanide is necessary if washing with hot acid is extensive.
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 A Process for the Recovery of Gold from Activated Carbon by Leaching and Electrolysis written by J. B. Zadra and published by . This book was released on 1950 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Kinetics of the Elution of Gold from Activated Carbon written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the rate of elution of aurocyanide from activated carbon in small laboratory reactors is reported. The effects of various operating parameters such as the concentrations of cyanide, hydroxide, and gold in the eluant, the temperature, and the flowrate of the eluant on the rate were investigated. A semi-empirical kinetic model, which was previously developed for the adsorption of gold on to activated carbon, is shown also to describe quantitatively the kinetics of elution. This model is extended to the description of the rate of elution of carbon from fixed bed columns by the Zadra elution procedure. The electrowinning of gold in closed circuit with the elution column is included as part of the model. The use of the model in the prediction and optimization of the performance of actual elution plants is also described.
Download or read book Carbon in pulp Technology for the Extraction of Gold written by and published by . This book was released on 1982 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process for Recovering Gold and Silver from Activated Carbon by Leaching and Electrolysis written by J. B. Zadra and published by . This book was released on 1952 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Elution of Gold and Silver from Activated Carbon Using Organic Solvents and the Reactivation of the Eluted Carbon Using Steam written by J. P. Martin and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Processing Gold Ores Using Heap Leach carbon Adsorption Methods written by Harold J. Heinen and published by . This book was released on 1978 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research and Development in Extractive Metallurgy 1987 written by and published by . This book was released on 1987 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Randol Gold Forum 1988 written by Randol International Ltd and published by . This book was released on 1988 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Au gold Recovery Using an Activated Carbon Column written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of a process involving the use of activated carbon in a multi-stage column (NIMCIX contactor) for the recovery of gold from unclarified pregnant solutions was investigated on pilot-plant scale. It was found that satisfactory extractions, corresponding to a recovery of 99,6 per cent, can be achieved with an average gold concentration of 0,0077 p.p.m. in the barren solutions from a feed averaging 1,89 p.p.m. The results show that excessive loading of CaCO3 can be prevented by lowering of the pH of the feed to about 7,6. This obviates the need for the carbon to be treated with hydrochloric acid. The gold was eluted from the carbon by the Zadra procedure. The operating conditions of the elution and electrowinning circuits are reported, and the elution of the gold and other metals is discussed. The reactivation of the carbon, which was carried out in a vibrating-deck kiln, is described, and the effects of this reactivation on the activity of the carbon and its microstructure are also discussed. The consumption of reagents in the adsorption and elution circuits is presented in sufficient detail to allow the potential of the activated-carbon process as an alternative to the Merill-Crowe process for the treatment of high-grade solutions to be evaluated. In addition, the results of parallel small-scale investigations on the effect of pH on the loading of CaCO3, gold, and other metals on activated carbon are presented and discussed briefly.
Download or read book A Process for the Recovery of Gold from Activated Carbon by Leaching and Electrolysis written by and published by . This book was released on 1950 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions of Society of Mining Engineers Inc written by and published by . This book was released on 1988 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book World Gold 91 written by and published by Australasian Institute of Mining and Metallurgy. This book was released on 1991 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Randol Gold Forum 90 written by Randol International Ltd and published by . This book was released on 1990 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Elution of Gold from Activated Carbon by Sodium Sulphide written by Melinda Grimes and published by . This book was released on 1996 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
