Download or read book The Mechanism of Adsorption of Au CN 4 Onto Activated Carbon written by and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Au(CN)4(-) species adsorbs onto activated carbon as a chemically unchanged ion pair of the type M(n+)[Au(CN)4(-)]n, in a manner similar to that postulated for Au(CN)2(-). The affinity of carbon for Au(CN)4(-) is greater than that for Au(CN)2(-). A Mossbauer spectroscopic investigation has confirmed that Au(CN)4(-) is the species adsorbed from both acidic and neutral solutions. The Mossbauer spectrum of carbon that is loaded with Au(CN)4(-) and subsequently boiled in hydrochloric acid is interpreted in terms of the presence of Au(CN)2Cl2(-), Au(CN)2(-) and AuCN as products of the decomposition of Au(CN)4(-).

Download or read book The Mechanism of Adsorption of Dicyanoaurate on Activated Carbon written by Arturo Sabio Ibrado and published by . This book was released on 1992 with total page 426 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 Mechanisms of Adsorption of Ag CN 2 and Ag on to Activated Carbon written by and published by . This book was released on 1992 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silver is adsorbed onto activated carbon from potassium cyanide solution initially in the form of the K+Ag(CN)2- ion pair. Infrared spectra suggest that the cyanide stretching frequency for Ag(CN)2- is shifted to lower wavenumbers upon adsorption, to approximately that of Ag(CN)4 3-. This may be a result of an aggregation of the species on the carbon surface. Boiling in hydrochloric acid results in the formation of AgCN and AgCl. The presence of AgCN is also indicated on Ag(CN)2- -loaded carbons that have dried at temperatures of 120 degrees C or higher. Subsequent treatment with hot sodium hydroxide solution results in the reduction of all of the silver on the carbon to the metallic state, with some desorption of Ag(CN)2-. When silver is loaded onto activated carbon from a silver nitrate solution, adsorption takes place via a dual mechanism, with reduction to metallic silver and precipitation of AgCl both taking place on the carbon surface.

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 Information Circular written by and published by . This book was released on 1978 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Mechanism of Adsorption of Aurocyanide Onto Activated Carbon written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanism of adsorption of aurocyanide onto activated carbon and its subsequent elution are examined in this study, with special reference to the effects of acid and alkali treatment on the system. The results, including a careful analysis of the distribution of all ions in the adsorption and elution processes, are discussed, and evidence for the adsorption and elution mechanisms involved is presented. It is proposed that, under normal plant conditions, aurocyanide is extracted onto activated carbon in the form of an ion pair, M(n+)[Au(CN)2(-)]n, and eluted by hydroxide or cyanide. The hydroxide or cyanide ions react with the carbon surface, rendering it relatively hydrophilic with a decreased affinity for neutral species. Additional adsorption mechanisms are shown to operate under other conditions of ionic strength, pH, and temperature, and it is suggested that this may account in part for the lack of agreement among workers.

Download or read book Hydrometallurgy 2008 written by and published by SME. This book was released on 2008 with total page 1201 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Metal Impurities on the Adsorption of Gold by Activated Carbon in Cyanide Solutions written by S. A. N. Sheya and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Activated Carbon Adsorption written by Roop Chand Bansal and published by CRC Press. This book was released on 2005-05-24 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: High surface area, a microporous structure, and a high degree of surface reactivity make activated carbons versatile adsorbents, particularly effective in the adsorption of organic and inorganic pollutants from aqueous solutions. Activated Carbon Adsorption introduces the parameters and mechanisms involved in the activated carbon adsorption

Download or read book Fundamentals of Aqueous Metallurgy written by Kenneth N. Han and published by SME. This book was released on 2002 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive technical reference provides an overview of aqueous metallurgy and its applications. The text presents the physiochemical principles of various water-based processes.

Download or read book Report of Investigations written by and published by . This book was released on 1989 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparative shortwall and room and pillar mining costs written by Larry E. Green and published by . This book was released on 1977 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Adsorption of the Cyano Complexes of Groups IB and IIB Metals on Activated Carbon written by Arturo Sabio Ibrado and published by . This book was released on 1986 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Minerals Metals and Materials 2016 written by Shadia Ikhmayies and published by John Wiley & Sons. This book was released on 2016-02-09 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: Characterization is an important and fundamental step in material research before and after processing. This bookfocuses on the characterization of minerals, metals, and materials as well as the application of characterization results on the processing of these materials. It is a highly authoritative collection of articles written by experts from around the world. The articles center on materials characterization, extraction, processing, corrosion, welding, solidification, and method development. In addition, articles focus on clays, ceramics, composites, ferrous metals, non-ferrous metals, minerals, electronic, magnetic, environmental, advanced and soft materials. This book will serve the dual purpose of furnishing a broad introduction of the field to novices while simultaneously serving to keep subject matter experts up-to-date.

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.