Recovery Of Gold And Silver In Secondary Slag From Gold Refining Process By Co Precipitation With Metal Hydroxides
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Recovery Of Gold And Silver In Secondary Slag From Gold Refining Process By Co Precipitation With Metal Hydroxides
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Author : Romchat Chairaksa
language : en
Publisher:
Release Date : 2005
Recovery Of Gold And Silver In Secondary Slag From Gold Refining Process By Co Precipitation With Metal Hydroxides written by Romchat Chairaksa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Precious metals categories.
Purification of gold using chlorine gas as an extracting agent is one of the oldest and most widely used process in large scale gold refining, so called "Miller Chlorination Process" Slag derived from this process is usually called "Primary slag" generally containing 5-10 wt% gold. Secondary slag produced after smelting of the primary slag generally contains approximately 200-300 ppm gold and 1000 ppm silver, which indicates the high potentiality for further recovery of precious metals (Au and Ag). The aim of this study is to develop an effective recovery system for gold and silver, from secondary slag during gold refining process. The recovery process consists of both physical process (comminution and shaking table) and chemical separation (extraction with nitric acid and aqua regia respectively). The extracted gold and silver were recovered by co-precipitation with metal (e.g. Fe, Cu) hydroxides at pH 6, and then, the co-precipitation including goldwas dissolved with 1 M hydrochloric acid or 1 M nitric acid. The result of physical separation process showed alloy of Au-Ag-Cu was liberated from the slag under the size of 70 Mesh. After passing the shaking table, the concentration of slag was upgraded from 0.015% to 0.126% of gold and from 0.174% to 1.56% of silver. Then, the two-stage leaching with nitric acid and aqua regia was applied to recover silver as AgCl precipitate, and gold as [AuCl[subscript 2]] with AgNo[subscript 3] impurities. Then, the solution or leachate was further concentrated by co-precipitation with metal (Fe, Cu) hydroxides at pH 6. The chlorohydroxy Au (III) complexes co-precipitated on metal hydroxides are reduced to elemental gold (Au[superscript 0]) without adding any reducing reagents. The gold and silver was further purified by (comparatively) dissolved using 1M HNO[subscript 3] and 1M HCI. The results showed that gold and silver could be effectively purified by treatment of 1M HNO[subscript 3] rather than that of 1M HCI.
The Recovery Of Gold From Secondary Sources
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Author : Syed Sabir
language : en
Publisher: World Scientific
Release Date : 2016-06-29
The Recovery Of Gold From Secondary Sources written by Syed Sabir and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-29 with Science categories.
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.
Gold
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Author : Nathaniel Arbiter
language : en
Publisher: CRC Press
Release Date : 1990
Gold written by Nathaniel Arbiter and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Business & Economics categories.
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
The Chemistry Of Gold Extraction
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Author : John Marsden
language : en
Publisher: SME
Release Date : 2006
The Chemistry Of Gold Extraction written by John Marsden and has been published by SME this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
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.
A Process For The Recovery Of Gold From Activated Carbon By Leaching And Electrolysis
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Author : J. B. Zadra
language : en
Publisher:
Release Date : 1950
A Process For The Recovery Of Gold From Activated Carbon By Leaching And Electrolysis written by J. B. Zadra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1950 with Gold categories.
Recovery And Refining Of Precious Metals
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Author : C.W. Ammen
language : en
Publisher: Springer
Release Date : 1984
Recovery And Refining Of Precious Metals written by C.W. Ammen and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Juvenile Nonfiction categories.
Hydrometallurgical Treatment Of Electronic Scrap To Recover Gold And Silver
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Author :
language : en
Publisher:
Release Date : 1985
Hydrometallurgical Treatment Of Electronic Scrap To Recover Gold And Silver written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Electronic materials categories.
Precious Metals Recovery From Low Grade Resources
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Author :
language : en
Publisher:
Release Date : 1985
Precious Metals Recovery From Low Grade Resources written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Precious metals categories.
This information circular describes research the Bureau of Mines has conducted to improve technology for recovering precious metals from low-grade resources. Many of the reported findings are recent, and some of te work described is ongoing. Topics discussed include cyanidation of carbonaceous gold ores to enhance gold recovery, a new method for precipitating mercury during cyanide leaching of gold ores, a staged heap leaching process to generate suitable solutions for direct electrowinning of gold, the use of anion-exchange resins to recover gold from cyanide solutions, and precious metals recovery from electronic scrap.
Recovering Precious Metals
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Author : George E. Gee
language : en
Publisher: Watchmaker Publishing
Release Date : 2002-10-28
Recovering Precious Metals written by George E. Gee and has been published by Watchmaker Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-10-28 with Precious metals categories.
Refining Precious Metal Wastes Gold Silver Platinum Metals
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Author : Calm Morrison Hoke
language : en
Publisher:
Release Date : 1984
Refining Precious Metal Wastes Gold Silver Platinum Metals written by Calm Morrison Hoke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Metallurgy categories.
