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 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 concept of a multistage fluidized-bed column for the treatment of unclarified solutions dates back to the mid-1950s. Mintek, then the National Institute for Metallurgy, started developmental work on a continuous ion-exchange contactor in 1968, which culminated in the installation of a demonstration NIMCIX plant for the recovery of uranium at the Blyvooruitzicht Gold Mine in 1976. A number of NIMCIX plants were subsequently erected, both in South Africa and abroad, for the recovery of uranium from unclarified liquors. This technology has now been successfully applied to the recovery of gold by the use of activated carbon. The work described in the paper was carried out on a pilot plant that incorporated a seven-stage NIMCIX column and a Zadra-type elution-electrowinning circuit. An interesting feature of the operation was the adjustment of the feed solution to a pH value between 7,5 and 7,8 to reduce fouling of the carbon by carbonate and to improve the loading of gold onto the carbon. The use of a NIMCIX column in place of a tank-cascade for the recovery of gold from unclarified solutions promises lower plant capital costs, which could enhance the viability of, for example, a low-grade heap-leaching operation.
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 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 The Recovery of Gold by Activated Carbon in a NIMCIX Column written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Columns filled with activated carbon have been used in the past to recover gold, often at low concentrations, from solution streams. These streams have included barren solutions after zinc precipitation, return-dam solutions, dewatering-filter filtrates, heap-leaching solutions and a high-tenor solution resulting from the pressure cyanidation of a refractory ore. These columns have been operated by different methods, for instance, as fixed-bed upflow columns, or as single (deep) fluidized beds, with or without a retaining screen on top to prevent carry-over of the carbon, which allows for higher solution flowrates. However, the most successful method of operation has been as a multiple-stage fluidized-bed column in the countercurrent mode, eg, the NIMCIX column. This configuration allows for a stable gold-concentration profile by preventing axial mixing, and thus ensures efficient extraction of the gold from solution, since the most active carbon always 'sees' the least concentrated solution. It also has lower capital and operating costs than other options. Fluidized-bed columns have an added advantage in that they can treat unclarified solutions and slurries. The NIMCIX column has been satisfactorily tested with slurries containing up to 23 per cent solids in the carbon-in-pulp-in-column (CIPIC) process. In the light of its versatility, the NIMCIX column can be incorporated into a variety of possible flow-schemes for the recovery of gold. Some of these are described, and the costs of installing a NIMCIX column to recover gold from both a solution and a slurry are discussed.
Download or read book Recovery of Gold from Arsenopyrite Concentrates by Cyanidation carbon Adsorption written by Harold J. Heinen and published by . This book was released on 1980 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gold Recovery Using Activated Carbon written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gold Recovery Using Activated Carbon written by Pia Sinisalo and published by . This book was released on 2016-09-23 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Recovery Of Gold From Secondary Sources written by Syed Sabir and published by World Scientific. This book was released on 2016-06-29 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: New discoveries of the properties of gold at a nanoscale, and its effective use in modern technologies, have been driving a virtual 'gold rush'. Depleting natural resources has meant that the recovery of gold continues to grow in importance and relevance.The Recovery of Gold from Secondary Sources analyses the most advanced technology in gold recovery and recycling from spent sources of mobile phones, unwanted electronic equipment and waste materials. State-of-the-art techniques of hydrometallurgical and bio-metallurgical processing, leaching, cementing, adsorbing and separation through bio-sorbents are all described in detail, providing a guide for students and researchers. Discussion of environmentally friendly methods of recovery are presented, in order to provide modern-day alternatives to previous techniques. For those interested in the study of gold recovery this book gives a comprehensive overview of current recovery, making it the ultimate source of information for students, researchers, chemists, metallurgists, environmental scientists and electronic waste recovery experts.
Download or read book The Development of a Process for the Recovery of Gold from Gold bearing Solutions by Means of Activated Carbon Or Resin in a NIMCIX Column written by Mintek and published by . This book was released on 1990 with total page 14 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 Oxidation Process for Improving Gold Recovery from Carbon bearing Gold Ores written by Bernard J. Scheiner and published by . This book was released on 1971 with total page 22 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 Recovery of Gold from Return dam Solutions by Activated Carbon in a Multistage Column written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A pilot-plant investigation in a NIMCIX contactor has shown that activated carbon can extract more than 93 per cent of the gold in return-dam solutions. The average gold concentration in the barren solution was less than 0.003 mg/l from a feed averaging 0.048 mg/l. The carbon was eluted by the Zadra procedure. The operating conditions of the elution-electrowinning circuit are reported, and the elution of the gold and other metals is discussed. The reactivation of the carbon by use of the Rintoul kiln is described, together with the results of reactivation. The cost and the consumption of reagents in the process cycle is presented in sufficient detail to allow the economic viability of this technique for the recovery of gold from low-grade solutions to be evaluated.
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 Extraction of Gold III Using Modified Activated Carbon written by and published by . This book was released on 2009 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The activated carbons were modified with various potentially gold binding reagents by impregnation technique and their extraction efficiencies toward gold were evaluated. Tetrabutyl ammonium iodide (TBA) was found to be the most effective adsorbent for gold in terms of both extraction efficiency and speed. Various parameters were optimized around the preparation and utilization of this modified carbon in both batch and column methods. Several interfering ions commonly found in gold waste samples were found to have absolutely no effects to the extraction of gold. The adsorption isotherm was studied but no definite relation to any model was established. The breakthrough curve was used to demonstrate the improvement in gold extraction of the TBA-impregnated carbon over a commercial activated carbon and determine the adsorption capacity. The breakthrough capacity of the TBA-carbon and the commercial carbon were 90.62 and 18.00 mg/g respectively. The TBA-carbon was successfully applied to the recovery of gold from a real industrial waste sample.
Download or read book Gold written by Nathaniel Arbiter and published by CRC Press. This book was released on 1990 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
