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Primary germanium is most commonly extracted as a by-product of zinc smelting, but some is also derived from copper smelting and from coal (fly ash). While the U.S. does produce some primary metal ...
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In this article, a hydrometallurgical method for the selective recovery of germanium from fly ash (FA) has been tested at pilot plant scale. The pilot plant flowsheet comprised a first stage of water leaching of FA, and a subsequent selective recovery of the germanium from the leachate by solvent extraction method. The solvent extraction method ...
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Germanium recovery from coal fly ash by hydrometallurgical procedures was studied at the pilot scale (5 kg of fly ash/h). Results were used to design the equipment of a demonstration-sized plant (200 kg of fly ash/h). The process is based on hydrometallurgical operations: firstly a germanium extraction from fly ash by leaching and a consequent Ge separation from the other elements present in ...
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CN102787242B Method for recovering germanium and indium from germanium-containing material generated from lead and zinc smelting process 12/10/2013 US8603216 Extraction …
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The method of extraction of germanium from slag processing of polymetallic ores, including the opening of the slag extraction of germanium in the solution and selective sorption of Germany from solution by ion exchange, characterized in that the opening lead autoclave leaching slag alkali solution with a concentration of 20 wt.% at a ...
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non-dispersive extraction; germanium; fly ash; heavy metals Introduction Various forms of germanium have extensive applica-tions. It can be used in photodetectors (pure form), high refraction glass (as GeO 2), etc. Since the chemical purity of germanium is essential in its application, the recovery, separation, and purification of germanium is
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The solvent extraction of germanium and some heavy metals by commercial tri-octyl/decyl amine (Alamine 336), N-methyl-N, N-dioctyl chloride (Aliquat 336) and phosphine oxide (Cyanex 923) has been studied.In each extraction system, germanium was only extracted from a solution containing nickel, cadmium, cobalt, and zinc, which had a composition similar to gasification coal fly …
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The present work dealt with the characterization and treatment of liquid wastes produced during the hydrometallurgical recovery of germanium (Ge) from fly ash. The main metals causing reasons for environmental concern were arsenic (As), nickel (Ni) and antimony (Sb).
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Results were used to design the equipment of a demonstration-sized plant (200 kg of fly ash/h). The process is based on hydrometallurgical operations: firstly a germanium extraction from fly ash by leaching and a consequent Ge separation from the other elements present in the solution by solvent extraction procedures.
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At first, I thought they were going to remove a proper FLY from this woman's arm. Like a living, flying insect monster was going to wriggle out. That would have been cool, but …
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Concentrations of Ge(OH)4 (denoted as Gei, or inorganic germanium) and Si(OH)4 were measured in water column and pore water samples from San Pedro and…
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Germanium has been used to treat depression, arthritis, vision problems, elevated blood pressure, heavy metal poisoning, and cancer. Germanium ores are rare. Germanium is a hard, grayish-white element that has a metallic luster and the same crystal structure as diamond. In addition, germanium is a semiconductor, with electrical properties ...
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The PGCs obtained in the form of highly dispersed and coarse fly ashes and the slag should be converted into commercial compounds of germanium with the simultaneous extraction of valuable elements and the production of commercial aluminum sulfate and a mineral additive to concrete, as indicated previously [13, 14]. Experimental studies have ...
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Characterization and treatment of wastewater produced during the hydro-metallurgical extraction of germanium from fly ash Notice. The full text article is not available. The article you have requested is supplied via the British Library and is not available for immediate download.
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Germanium (Ge) is considered a critical element due to its many industrial applications; Ge is a metalloid used in solar cells, fiber optics, metallurgy, chemotherapy, and polymerization catalysis. The main sources of Ge are sulfides ores of Zn, Pb, and Cu, coal deposits, as well as by-products and residues from the processing of these ores and coals (e.g., smelting flue dust and coal fly ashes).
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The solvent extraction (SX) method for the recovery of germanium from fly ash is based on the germanium-1, 2-dihydroxybenzene (catechol, ) (C 6 O 2 H 6 ) chelate and the subsequent extraction of the complex using tri- n -octylamine (TOA) ((C …
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Germanium is a chemical element with the symbol Ge and atomic number 32. It is a lustrous, hard-brittle, grayish-white metalloid in the carbon group, chemically similar to its group neighbors silicon and tin.Pure germanium is a semiconductor with an appearance similar to elemental silicon. Like silicon, germanium naturally reacts and forms complexes with oxygen in nature.
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A method is disclosed for recovering gallium and/or germanium from fly ash which comprises pelletizing the fly ash, treating the pellets in the presence of an oxidizing gas at a temperature of from about 900° C. to just below the fusion temperature of the pellets, treating the pellets in the presence of a reducing gas at the same temperature range, and recovering gallium and/or germanium ...
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Increasing the extraction temperature to 50, 90 and 150 °C, Ge extraction yields were kept at similar levels, while reducing the content of impurities, the water/fly ash ratio and extraction time.
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(1985). Extraction and Flameless AAS Determination of Germanium in Lignite Fly Ash. Analytical Letters: Vol. 18, No. 19, pp. 2467-2475.
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Monday, December 7, 2015 Germanium in the coal fly ash In recent years its practiced a new way of producing germanium Methods of Germanium extraction Germanium is a semiconductor, hard, and crystalline element. Germanium …
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This article is concerned with a simple hydrometallurgical method for the selective recovery of germanium from fly ash (FA) generated in an integrated gasification with combined cycle (IGCC) process. The method is based on the leaching of FA with water and a subsequent concentration and selective separation of germanium by a solvent method.
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Minerals 2015, 5 299 1. Introduction Germanium is not very abundant in the Earth's crust, occurring only at a concentration of 1 to 7 ppm [1]. It is widely dispersed in nature, sometimes as a pure metal in association with more abundant elements (such as Zn and its minerals) and as germanium oxide. By far, the most important application of germanium is in the manufacturing of semiconductors ...
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In each extraction system, germanium was only extracted from a solution containing nickel, cadmium, cobalt, and zinc, which had a composition similar to gasification coal fly ash aqueous leach solutions.
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(2019). Non-dispersive selective extraction of germanium from fly ash leachates using membrane-based processes. Separation Science and Technology: Vol. 54, No. 17, pp. 2879-2894.
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Arroyo, F., Fernánde z-Pe reir a, C., Co ca, P., 201 0, Precipitation of Germanium from C oal Fly Ash Leachates . Coal Combustion and Gasifi cation Products 2, 28 - 34, doi: 10. 4177/C CGP …
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Hydrometallurgical extraction (1) The present work dealt with the characterization and treatment of liquid wastes produced during the hydrometallurgical recovery of germanium (Ge) from fly ash. The main metals causing reasons for environmental concern were arsenic (As), nickel (Ni) and... yielded a 97.5% removal of metals.
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Germanium is recognized as an important metalloid used in high-technology applications. One of the recent usages is as arrays in X-ray fluorescence microscopy (Agyeman-Budu et al. 2016).Lead–zinc–silver and copper ores, as well as coal fly ashes, are the main resources of germanium (Yellishetty et al. 2017).Due to the rare mined resources of germanium, the efficient recovery of germanium ...
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Under a comparable Cyanex 923 condition, the germanium extraction efficiency by the aforementioned extractants was in the order Aliquat Fly ashes 336 > Alamine 336 > Cyanex 923. The slope analysis method showed that 2 moles of Alamine 336 and Aliquat 336, as well as 4 moles of Cyanex 923, participated in the extraction of germanium.
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Download Extraction Of Germanium And Gallium From Coal Fly Ash And Phosphorus Furnace Flue Dust Book For Free in PDF, EPUB. In order to read online Extraction Of Germanium And Gallium From Coal Fly Ash And Phosphorus Furnace Flue Dust textbook, you need to create a FREE account. Read as many books as you like (Personal use) and Join Over 150.000 Happy Readers.
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The invention relates to a method for selectively leaching germanium and gallium from complex smelting slag with the germanium and the gallium or ore with the germanium and the gallium, and belongs to the field of non-ferrous metal hydrometallurgy and secondary-resource recycling. The method for selectively leaching the germanium and the gallium from the complex smelting slag with the ...
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