Results 261 to 270 of about 702,238 (308)

Bioprocessing for Enhanced Gold Recovery

Mineral Processing and Extractive Metallurgy Review, 1992
The use of autotrophic and heterotrophic microorganisms in the solublisation of gold from refractory sulphides and oxide ores is discussed. Basic microbiological characteristics of the leaching bacteria are outlined. Reaction mechanisms in the biooxidation of gold-bearing arscnopyrite and pyrite an: illustrated with special reference of Thiobacillus ...
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Selective Gold Recovery Using Orange Waste

Separation Science and Technology, 2009
Abstract Orange waste was crosslinked with sulfuric acid to immobilize the hesperetin-like molecule. Au(III) was selectively recovered from hydrochloric acid, exhibiting the negligible affinity to other precious metals and base metal ions. The isotherm demonstrated that the maximum loading capacity on the crosslinked orange waste is approximately 10 ...
Hidetaka Kawakita, Minoru Abe, Jun-Ichi Inoue, Keisuke Ohto, Hiroyuki Harada, Katsutoshi Inoue   +5 more
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Optimisation of gold recovery by selective gold flotation for copper-gold-pyrite ores

Minerals Engineering, 2001
Abstract Gold flotation is often overlooked as a processing option as the precious metal is viewed as being associated with the sulphide particles present in the ore, even when a proportion of the gold is free. Gold does float readily, however, and the free gold can be selectively floated away from an ore containing sulphides.
K Forrest, D Yan, R Dunne
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Poly-thiosemicarbazide membrane for gold recovery

Separation and Purification Technology, 2014
Abstract A novel polymeric membrane adsorber with a high density of adsorption sites that can selectively capture Au(III) ions, is proposed as an efficient alternative to recover gold from dilute solutions. Poly-thiosemicarbazide (PTSC), a polymer that contains one chelate site per monomeric unit, was used to fabricate the membranes. This polymer can
Luis Francisco Villalobos, Tahir Yapici, Klaus-Viktor Peinemann   +2 more
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Recovery of Secondary Gold

1991
The cleanest kinds of precious metal scrap are old jewelry, metal parts of old dentures, and the dust and bits produced in the manufacture of jewelry or dentures. Old jewelry may be made of sterling1 silver, carat2 gold (alloyed gold), or of base metals plated with gold.
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Recovery of gold from electronic scrap

Journal of Chemical Education, 1988
In this paper, the authors describe a method for purification of a small amounts of gold to high purity.
James W. Hill, Tommy A. Lear
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Recovery of Gold from Solutions

1991
Cyanidation has been used to extract gold (and silver) from ores, concentrates, and calcines since the 1890s. The precipitation of gold from cyanide solutions by zinc cementation was patented in 1884 and was applied industrially as early as the cyanidation process.
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Coal–oil assisted flotation for the gold recovery

Minerals Engineering, 2005
Abstract Using coal–oil agglomeration method for free or native gold recovery has been a research subject for many researchers over the years. In this study, a new approach “coal–oil assisted gold flotation” was used to recover gold particles. The coal–oil–gold agglomeration process considers the preferential wetting of coal and gold particles.
Cilingir, Y, ŞEN, SEZAİ, SEYRANKAYA, ABDULLAH   +2 more
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Recovery of Gold with Japanese Cedar Wood Powder

ChemSusChem, 2009
Gold is primarily obtained from its rich ores in nature. However, in most technologically advanced countries the so-called “urban mines,” formed by piles of obsolete electric and electronic devices, are attracting much attention as a rich source of gold and other precious metals. Although urban mines contain high concentrations of gold in comparison to
Durga, Parajuli, Koichi, Hirota
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The Mineralogy of gold and its relevance to gold recoveries

Mineralium Deposita, 1990
Processing of most gold ores, other than placers, involves conventional gravity separation and direct cyanidation. The difficult (or refractory) gold ores are not amenable to direct cyanidation and these ores require detailed mineralogical investigations to assist in determining the recovery processes.
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