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Abstract. 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% unburned carbon and 2.2% ...
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This study investigated the use of microwave-assisted leaching to recover the vanadium (V) and nickel (Ni) of fly ash collected from power plants. The fly ash sample was characterized using XRF, ICP-OES, powder X-ray diffraction, FESEM, and a laser particle size analyzer. ... Chemical separation of fly ash components by thermal …
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As a second step in our work of metal recovery from heavy oil fly ash, mutual separation of V/Fe was studied using a chelating resin, DIAION CR11 or a strong acid …
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Murase et al. investigated extraction and separation of vanadium from a fly ash of Orimulsion. Air-Cl 2 or N 2-Cl 2 gas mixture were used to chlorinate valuable elements (V, Ni and Mg). The separation of V and Fe were achieved by controlled temperature of chlorination. V and Fe was selectively extracted by chlorination at 400 °C …
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Abstract. Low percentages of vanadium, nickel and iron are associated with the bitumen fraction of tar sands. Compounds of these elements are concentrated into the fly ash produced when the petroleum coke fraction of this bitumen is burned. It appears that these sands also represent a resource for vanadium and, to a lesser degree, for nickel ...
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Since the yield of heavy minerals obtained by separation was 62.24%, it indicated the physical separation method could significantly reduce the cost of leaching and recovering of fly ash metal ...
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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 ...
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An exhaustive characterization of IGCC fly ash has been published elsewhere [12] and the main chemical characteristics of this fly ash are summarized in Table 1. The optimal Ge extraction conditions (90 °C, water/fly ash ratio (W/FA) = 5 L/kg), 6 h, mechanical stirring, 500 rpm) from Puertollano IGCC fly ash prompted by Font et al. …
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Solvent Extraction and Separation of Nickel and Vanadium From Sulfate Leach Liquor of Power Plant Fly Ash Using D2EHPA and Cyanex 272 ... As a result, optimum separation of vanadium over nickel was achieved with a Cyanex 272 to D2EHPA ratio of 0.35 M: 0.25 M. Based on the optimum results, pH50 values for nickel and vanadium were changed …
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After some preliminary tests, two leaching stages of fly ash to recover vanadium, molybdenum and nickel were selected. A first stage was an alkaline leaching of fly ash to recover vanadium and molybdenum followed by a second stage using sulfuric acid leaching of the residual ash to recover nickel. The impact of some operational …
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Abstract. Heavy oil fly ash "HOFA" is the fly ash generated in power stations using heavy oil as fuel. HOFA is considered a hazardous waste because it contains considerable …
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DOI: 10.1016/J.CEJ.2011.07.080 Corpus ID: 98760333; Extraction and separation of vanadium and nickel from fly ash produced in heavy fuel power plants @article{AlGhouti2011ExtractionAS, title={Extraction and separation of vanadium and nickel from fly ash produced in heavy fuel power plants}, author={Mohammad A. …
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Read this article. Fly ashes resulting from the combustion of fuel containing high concentrations of vanadium that can be slightly removed by water and more …
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Burnet et al. introduced a chlorinating process, where the fly ash is first separated into magnetic and non-magnetic fractions. The non-magnetic fraction of CFA was mixed with carbon and chlorinated in a fixed bed. ... Guibal E (2007) Vanadium recovery from oil fly ash by leaching, precipitation and solvent extraction processes. …
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Conclusions sodium hydroxide (at controlled pH, ca. pH 12) and a pre- cipitation procedure (in two steps: pH 8 for Al precipita- The treatment of oil fly ash from power plants for the tion, and pH 5 in the presence of 1 M NH4Cl for selective recovery of vanadium can be performed in a vanadium precipitation) allows the selective recovery of two ...
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Solvent Extraction and Separation of Nickel and Vanadium From Sulfate Leach Liquor of Power Plant Fly Ash Using D2EHPA and Cyanex 272. Mehdi Noori, Ehsan Vahidi, Ata Babakhani. Download Free PDF. View …
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Increasing research activity is mostly observed in traditional areas: metal extraction from fly ash and the reduction of metals from the ash to V–Fe and Ni–Fe …
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Extraction of Vanadium from Athabasca Tar Sands Fly Ash. Theproduction of refinery grade oil from the Alberta tar s nds deposits ascurrently practiced by Suncor (formally Great Canadian O Sands l Ltd.--GCOS) generates a substantial amount of petroleum coke fly ash which contains appreciable amounts of valuable metals such as …
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In order to extract nickel and vanadium from heavy oil fly ash, Tokuyama et al. [31] investigated a process with two different steps; leaching and ion exchange. Al-Ghouti et al. [32] studied extraction and separation of vanadium and nickel from fly ash produced in heavy fuel plants. Although researchers have tried to develop a process for ...
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Abstract. The recovery of vanadium from heavy oil fly ash having a high carbon content was performed using a four-step process consisting of a preliminary burning in order to reduce the ...
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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, followed by Na 2 CO 3 leaching of the residual …
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Improving the purity of aluminum products can significantly enhance the comprehensive utilization value of fly ash. In the present paper, a novel process of preparing high-purity aluminum chloride of 99.99% from the aluminum-rich circulating fluidized bed fly ash by acid leaching-recrystallization method was developed, and the …
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Bioengineering approaches to vanadium and nickel separation from ashes appear to be far from production but potentially promising . Li and ... Chianeh, F.R.; Gu, T. Ultrasound-assisted leaching of vanadium from fly ash using lemon juice organic acids. RSC Adv. 2020, 10, 1685–1696. [Google Scholar] Liu, J. Recovery of Vanadium and …
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To achieve this goal, an industrial waste of El Kriymat boiler fly Ash was used for recovering its content of vanadium, nickel and zinc. About 97, 95 and 99% respectively of these economic elements were first dissolved from boiler fly ash magnetic concentrate (after physical concentration).
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Section snippets Materials. The fly ash sample was a mixture collected from different power plant stations in Iran which use oil as fuel. Sulfuric acid (H 2 SO 4) used in the leaching was obtained from Merck, with a purity of 96–98%.Ammonium iron (II) sulfate (NH 4) 2 Fe(SO 4)⋅6H 2 O, ammonium persulphate (NH 4) 2 S 2 O 8 and potassium …
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Navarro et al. (2007) succeeded in extracting vanadium from oil fly ash with both sulphuric acid and sodium hydroxide lixiviants. In addition to the economic benefit of recovering valuable material from a waste product, this also had the effect of reducing the toxicity of the fly ash, making it easier to dispose of.
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Chemical analysis on both metals precipitate on the extraction of vanadium from oil ashes, J. Chem. Soc. Faraday Trans. 1 (80) (1984) 1777–1785. revealed that the metal separation was satisfactory; however, co- [18] R. Navarro, J. Guzman, I. Saucedo, J. Revilla, E. Guibal, Vanadium recovery from precipitation of other metals like Fe was ...
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The main organic acid produced by this fungus is malic acid. The optimum parameters for bioleaching of V and Ni from HOFA are; the fly ash concentration is 1% (w/v), pH is 6 for V and pH is 8 for Ni, and the bioleaching time is 10 days. The maximum recovery obtained for V and Ni is 65.4% and 74.6%, respectively.
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Al-Ghouti et al. [32] studied extraction and separation of vanadium and nickel from fly ash produced in heavy fuel plants. Although researchers have tried to develop a process for extracting and ...
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This paper discusses the experimental extraction of vanadium and nickel from oil-fired fly ash. The results indicated that leaching of oil-fired fly ash in 0.5 N of sulfuric acid led to an extraction of 65% vanadium, 60% nickel, and 42% iron, along with an increase in the concentration of sulfuric acid. When leached in 2 N sodium hydroxide ...
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