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 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 The Use of Activated Charcoal in a NIMCIX Column for the Recovery of Gold from Cyanide Solutions written by and published by . This book was released on 1984 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a resume of the work undertaken during the CHARGOLD project between January 1976 and July 1980. Investigations were carried out on the recovery of gold by activated charcoal in a continuous ion-exchange (NIMCIX) column from the following solutions: (a) an unclarified filtrate from the dewatering filters of a uranium plant, (b) an unclarified calcine filtrate, (c) a Merrill barren solution from the uranium plant at Vaal Reefs North Gold Mine (West Section), and (d) a clarified pregnant solution from Durban Roodepoort Deep Gold Mine. Barren solutions high in gold were obtained from the unclarified filtrate owing to a rapid build-up of calcium carbonate on the charcoal. This was overcome by regular washing with acid or adjustment of the pH value of the feed. Gold and silver displace the base metals once there is competition for absorption sites. The absorption of gold from Merrill barren solution was poor owing to the high concentrations of calcium on the charcoal. Recoveries of 90 and 99 per cent were obtained from the unclarified calcine filtrate and the clarified pregnant solution respectively. The charcoal was successfully eluted with sodium hydroxide followed by washing with water at 90 degrees C. The concentration of sodium hydroxide has no significant effect on the efficiency of elution, although pretreatment for at least 1 hour is essential. The temperature of the stripping water should be as high as possible, but the hardness of the water is not critical. The charcoal was regenerated in a rotary kiln at a temperature of 800 degrees C. The gold in the resulting eluate was recovered in an electrowinning cell designed at the Anglo American Research Laboratories.
Download or read book Unrestricted Mintek Publications written by and published by . This book was released on 1987 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 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 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 Advances in Gold Processing Technology written by and published by . This book was released on 1996 with total page 100 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 Recovery of Gold by a Carbon in pulp Process written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A process for adsorbing gold from a leach pulp by means of activated carbon is described in which the leach pulp (the leach solution together with the subdivided gold bearing ore) is diluted to a specific gravity of less than that of the activated carbon and is subsequently passed upwardly through a multistage liquid/solid contacting column. The contacting column is of the Cloete, Haines ZA713139 - File 17-0-07) type having perforated plates or trays defining a series of vertically adjacent stages and the operation of the column has a cycle which includes a first part during which upward flow of diluted pulp fluidizes the activated carbon, a second part in which the carbon is allowed to settle on the trays and a third part during which a reverse flow of diluted pulp carries carbon downwardly through the column from one stage to another. In the third part of the cycle, loaded carbon is removed from the lowermost stage and treated to recover adsorbed gold therefrom.
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
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 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 Geotitles written by and published by . This book was released on 1992 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Geoscience Documentation written by and published by . This book was released on 1991 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
