The uranium and vanadium are separated from the liquid by solvent extraction followed by a liquid-liquid ion exchange process which separates the uranium leaving the vanadium in the acid solution. This is subsequently oxidised and removed from the organic salts with soda ash. Vanadium polyvanadate is precipitated by the addition ammonium sulphate.
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Vanadium: Extraction, Manufacturing and Applications offers systematic coverage of the state-of-the-art in research and development of vanadium. ... coal ash, and meteorites. The sun's spectral lines also indicate the presence of vanadium. Select Chapter 4 - Extraction of vanadium from titanoferrous magnetite: mineral processing and ...
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The general scheme of vanadium and nickel extraction from fly ash is shown in Figure 6. 5.5. Pyrometallurgical Methods. Pyrometallurgical approaches [119,120,121,122] are qualitatively different from sintering with salts or controlled oxidation; their product are alloys of the target metals with a less expensive metal, usually Fe.
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DOI: 10.2139/ssrn.3954870 Corpus ID: 244057799; Vanadium Extraction from Stone Coal Using a Novel Two-Stage Roasting Technology @article{Tang2022VanadiumEF, title={Vanadium Extraction from Stone Coal Using a Novel Two-Stage Roasting Technology}, author={Zhidong Tang and Zhenya Zhou and Jia Xu Jin and Yong-sheng …
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Extraction and separation of vanadium and nickel from fly ash produced in heavy fuel power plants. Chemical Engineering Journal 2011, 173 (1), 191-197. …
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Although the recovery of vanadium from petroleum ash is a well established commercial practice, it is shown in the present work that such processes are not suitable for recovery of vanadium from the GCOS fly ash. ... H. Ottertun and S. Strandell:Solvent Extraction of Vanadium (IV) with D2EHPA and TBP, International Solvent Extraction Conference ...
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This research mainly focuses on the recovery of vanadium from oil fly ash by carbon removal and the roast-leach process. The oil fly ash contained about 85% …
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Vanadium as a rare element has a wide range of applications in iron and steel production, vanadium flow batteries, catalysts, etc. In 2018, the world's total vanadium output calculated in the form of metal vanadium was 91,844 t. The raw materials for the production of vanadium products mainly include vanadium-titanium magnetite, …
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Three different steps, such as carbon burning, salt roasting, and water leaching, were conducted to extract vanadium from the oil fly ash. First, a vanadium …
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Amidst vanadium's growing demand and environmental concerns in mining, the researchers, using naphthalimidedioxime, crafted a breakthrough method for eco-friendly recovery. Their acid-stable ...
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Akita et al. 50 studied the recovery of nickel and vanadium from oil fly ash in a two-step leaching process. Ni is leached with NH 4 Cl solution in the first step, …
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In this investigation, recovery and separation of nickel and vanadium from leach liquors of power plant fly ash were investigated by solvent extraction using D2EHPA, Cyanex 272, and their mixtures in…
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Tsai et al. [10] investigated vanadium extraction from oil-fired fly ash with a sodium hydroxide solution at 30 °C, and found that the recovery of vanadium reached 80% after 2 h. Another study treated black shale by ultrasonic leaching at 50 °C for 40 min, and determined that the vanadium recovery was approximately 67.7% [11] .
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Petcoke generated during bitumen upgrading is a potential source of vanadium for the global market. Recovering vanadium from the fly ash originating from the combustion of petcoke appears to be a suitable route for commercial implementation, given its high extraction rate. Although the technical fea …
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The effect of roasting and leaching variables on vanadium extraction from boiler ash, such as roasting temperatures, NaCl dosages, roasting time, and solid:liquid ratios has been studied. The ...
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Extraction of vanadium and molybdenum from alkaline leaching solution of boiler ash was investigated. The ash coming from heavy oil-fired electrical power station was leached with 8 mol dm^-3 sodium…
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However, the extraction percentage should be evaluated in the context of bulk V content in the leached material; for example, 80% V leached from 3990 ppm in asphaltite ash provide more V than recovery …
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Petcoke generated during bitumen upgrading is a potential source of vanadium for the global market. Recovering vanadium from the fly ash originating from the combustion of petcoke appears to be a suitable route for commercial implementation, given its high extraction rate. Although the technical feasibility of the recovery process has been …
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Fly ashes resulting from the combustion of fuel containing high concentrations of vanadium that can be slightly removed by water and more efficiently by alkaline or acid solutions. This uncontrolled release can contaminate water sources and requires appropriate storage of fly ashes. This study investigated the possibility of cleaning the …
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The results obtained showed that, to extract vanadium with amines, it was necessary to work at pH 2 and oxidize, because vanadium in the ashes is essentially in a reduced state. 3 4 pH Raffinate Figure 1 Effects of amine type and acidity on vanadium extraction Extraction results are based on 10 min bath shaker tests made using equal …
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The solid residues produced from Ge extraction with water, performed at 25 and 90 °C, water/fly ash (W/FA) ratio of 2, 5, and 10 L/kg and 6, 12, and 24 h on Puertollano IGCC fly ash, were used as a starting material for the Ga and V extraction tests.Since the preliminary water leaching did not noticeably altered the major fly ash …
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Highlights Large amounts of fly ash are produced as a result of burning diesel fuel in power stations. Ni is selectively eluted from the FA using NH 3 solution and was precipitated as NiS. V is extracted from Ni-free-FA by Na 2 CO 3 solution and precipitated by NH 4 Cl. The proposed method herein showed a high recovery (97%) for both metals.
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Anionic resins react with and separate pentavalent vanadate ions "V(V)" from other impurities in aqueous solutions, but chelating resins are used to extract V(IV) from acidic solutions. 80,88 Although there are several papers on using ion exchange resins for the separation of vanadium ions from other impurities in various media, the ...
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Vanadium remains in the raffinate, which is fed into a second solvent extraction circuit. There vanadium in turn is extracted in the organic phase, stripped with a 10 percent soda ash solution, and precipitated with ammonium sulfate. The ammonium metavanadate precipitate is filtered, dried, and calcined to V 2 O 5.
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Extraction of Vanadium from Athabasca Tar Sands Fly Ash C. O. GOMEZ-BUENO, D. R. SPINK AND G. L. REMPEL The production of refinery grade oil from the Alberta tar sands deposits as currently ... The GCOS fly ash has a larger vanadium concentration than most known commerical vanadium mineral deposits and this fact …
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A variety of chemical and physical separation methods have been implemented to extract vanadium and nickel from oil-coming wastes. Chemical separation of fly ash components by thermal processing ...
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The effect of roasting and leaching variables on vanadium extraction from boiler ash, such as roasting temperatures, NaCl dosages, roasting time, and solid:liquid ratios has been studied. The ...
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The distribution of vanadium in fly ash became more scattered, and the leaching of vanadium in fly ash was easier than that in stone coal. In order to extract vanadium from fly ash, some leaching agents such as sulfuric acid, hydrochloric acid, alkali and ammonia could be used to dissolve the unsolvable vanadium compounds.
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For instance, in 1987–1990, GRES-19 alone shipped 300 tons of ash waste for the extraction of vanadium . The rich ash was used to produce ferrovanadium. The technological properties of ash and fuel oil slag, taking into account the processing experience and data published by other authors, imply that this type of raw material can …
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There are many papers reporting the extraction of vanadium from fly ashes, petroleum fly ash and oil-fired fly ash using different operations. In this work, the simple method with the highest yield was studied for the extraction of vanadium pentoxide from fly ash in comparison with the work previously [5, 9–11].
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