@article{Hamidi2023ValorizationOF, title={Valorization of fly ash by nickel ferrite and vanadium oxide recovery through pyro-hydrometallurgical processes: Technical and environmental assessment.}, author={Amir Reza Hamidi and Sina Shakibania and Alireza Mahmoudi and Fereshteh Rashchi and Ehsan Vahidi}, journal={Journal of …
عرض المزيد1. Introduction1.1. Vanadium properties and applications. Vanadium is primarily used as an additive to steel in the form of ferrovanadium (Moskalyk and Alfantazi, 2003).Around 85% of the vanadium produced globally is used for this purpose (Swinbourne et al., 2016).Only minor amounts of vanadium are needed for this purpose, with …
عرض المزيدA process for recovering V and Ni from oil fly ash and for making the ash harmless has been developed. More than 80% of V and Ni are recovered. This process involves two-step leaching and ion exchange. The first step is leaching with water to dissolve Ni, Mg, Al, and Zn, and acid solution is used in the second step to recover V. …
عرض المزيدThe optimal Ga extraction conditions was determined as 25 degrees C, NaOH 0.7-1 M, NaOH/FA ratio of 5 L/kg and 6 h, attaining Ga extraction yields of 60-86%, equivalent to 197-275 mg of Ga/kg of fly ash. Re-circulation of leachates increased initial Ga concentrations (25-38 mg/L) to 188-215 mg/L, while reducing both content of …
عرض المزيدvanadium in fly ash was easier than that in stone coal. Keywords Stone coal ·Combustion fly ash ·Vanadium phases ·Sequential chemical extraction Introduction Stone coal is a kind of carbonaceous shale that contains vanadium. In China, the reserves of vanadium in stone coal are 1.18×l05 t in terms of V 2O 5, accounting for
عرض المزيدThe aim of this report is to determine the most effective conditions for a continuous solvent extraction circuit for the recovery of the vanadium component in fly …
عرض المزيدAlong with the studies on Ga, potential extraction of vanadium from this fly ash was also investigated. Vanadium is commonly recovered from titaniferous magnetite ores and as V2 O5 from by-products of crude oil, being mainly used to produce high-strength and low-alloy steels [22]. Since 50:50% coal/petcoke blend is gasified in Puertollano IGCC ...
عرض المزيدTeng, Y. Vanadium: A Review of. Different Extraction Methods to. Abstract: The excessive input of heavy metals such as vanadium (V) into the environment has been one of the consequences of global industrial development. Excessive exposure to V can pose a potential threat to ecological safety and human health.
عرض المزيدThis 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% vanadium by ...
عرض المزيدHeavy 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 amounts of …
عرض المزيدThe present work focuses on the design of integrated processes for vanadium recovery from oil fly ash. The processes firstly consist in a leaching step, …
عرض المزيدHeavy 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 amounts of heavy metals. However, it contains significant amounts of vanadium "V" and nickel "Ni", which are precious metals for manufacturing processes. This paper presents …
عرض المزيدDOI: 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. …
عرض المزيدVanadium extraction from fly ash. Fly ash specifically refers to the soot collected after burning fuel and coal, which is enriched with vanadium and can be used as a source of vanadium. Fly ash is generally treated by leaching with water, alkali, or acid solutions, where vanadium is separated from other impurities.
عرض المزيدThe 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 …
عرض المزيدThe composition of the fly ashes is reported in Table 1. Of the three oil-fired fly ash samples, sample C is characterised by a high carbonaceous fraction and by a lower vanadium content. The Orimulsion fly ash shows a much higher vanadium content than the oil fly ashes. Due to the Table 1 Main constituents of the fly ashes Žwt.%. Oil fly …
عرض المزيدRecovery of vanadium and nickel from an oil fly ash is studied in a two-step leaching process, carried out under ambient pressure without calcination. In the leaching, nickel …
عرض المزيدRecovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review. Ashraf Bakkar * a, Mohamed M. El-Sayed Seleman b, Mohamed M. Zaky …
عرض المزيدAbstract. In order to reduce the environmental impact due to land disposal of oil fly ash from power plants and to valorize this waste material, the removal of vanadium was investigated using leaching processes (acidic and alkaline treatments), followed by a second step of metal recovery from leachates involving either solvent extraction or ...
عرض المزيدDOI: 10.1007/s10163-022-01512-8 Corpus ID: 252914127; Phase transformation mechanism of boiler ash roasted with sodium salt for vanadium extraction @article{Ibrahim2022PhaseTM, title={Phase transformation mechanism of boiler ash roasted with sodium salt for vanadium extraction}, author={Ahmed H. Ibrahim and Xian …
عرض المزيدA study of the extraction of vanadium and nickel in oil-fired fly ash | Semantic Scholar. DOI: 10.1016/S0921-3449 (98)00007-X. Corpus ID: 95828226.
عرض المزيدRecovery of vanadium, nickel and molybdenum from fly ash of heavy oil-fired electrical power station. J. Stas A. Dahdouh Omar Al-Chayah. Environmental Science, Engineering. 2007. 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 …
عرض المزيدA process has been developed to recover gallium and vanadium from coal fly ash in which they exist at very low concentration in a mixture of high concentration of less desirable species. Aqueous solution containing 2.8 mg/l gallium and 35 mg/l vanadium was obtained by leaching with 1.5 mol/l sulfuric acid. These metals were then concentrated by use of a …
عرض المزيدThis study investigated the possibility of cleaning the ashes by leaching the material and recovering vanadium by solvent extraction (for metal concentration solutions higher than 200 mg V L −1) using several amine extractants (Primene JM-T, Amberlite LA-2, Alamine 336, and Alamine 304), a quaternary ammonium salt (Aliquat 336), and by a ...
عرض المزيدPetcoke is a solid carbon-rich residue produced during petroleum refining. Petcoke mineral matter is rich in vanadium that, when alloyed with other metals, can significantly improve its properties. Vanadium extraction from steel slags is well studied, while extraction from secondary sources such as petcoke is not well understood. …
عرض المزيدVanadium recovery from oil fly ash by … Vanadium recovery from oil fly ash by leaching, precipitation and solvent extraction processes [An article from: Waste Management] [R. Navarro, J. Guzman, I. … » Free Online Chat. Vanadium recovery from oil fly ash by leaching, … 1. Waste Manag. 2007;27(3):425-38. Epub 2006 Mar 23.
عرض المزيدSolvent extraction of vanadium and aluminum from Na2CO3 leaching of oil fly ash (top) using Aliquat 336 and vanadium stripping with NH4Cl + NH3 (1.5 M) (bottom) (Experimental conditions: leaching: Na2CO3 (0.66 …
عرض المزيدAbstract In the current project, V2O5 extraction from fuel fly ash was carried out, and the advanced extraction method was investigated. This reduced the percentage of industrial fuel fly ash residue pollution in the environment. The project was done with two materials: V2O5 and fuel fly ash. The extraction method includes …
عرض المزيدAl-Ghouti et al. [45] used Akita's procedure with some modifications for extraction and separation of vanadium (V) and nickel (Ni) from fly ash in the Jordanian Central Electricity Generating ...
عرض المزيدThe production of refinery grade oil from the Alberta tar sands deposits as currently practiced by Suncor (formally Great Canadian Oil Sands Ltd.—GCOS) generates a substantial amount of petroleum coke fly ash which contains appreciable amounts of valuable metals such as vanadium, nickel and titanium. Although the recovery of …
عرض المزيدVanadium Extraction by Carbon Burning and Roast-Leach Processes. Three different steps, such as carbon burning, salt roasting, and water leaching, were …
عرض المزيدRecovery of vanadium and nickel from an oil fly ash is studied in a two-step leaching process, carried out under ambient pressure without calcination. In the leaching, nickel is dissolved with NH 4 Cl in the first step, followed by vanadium leaching with Na 2 CO 3 in the second step. Both leachants depress the dissolution of iron and aluminium …
عرض المزيدThe vanadium in fly ash mainly existed in organic matter, aluminosilicate and Fe–Mn oxides, and the other vanadium existed in exchangeable fraction. Through the burning process, the vanadium was released and enriched in fly ash. ... (2010) Analysis on roasting process of vanadium extraction from stone coal [J]. Nonferrous Metals …
عرض المزيدThe industrial solid waste sample bearing nickel, vanadium, magnesium and iron as the major constituent was collected from SK Company, South Korea and had a greenish-yellow appearance. Weighed amount of the sample (as received) was digested in a mixed acid composed of HClO 4, H 2 SO 4 and HNO 3 and diluted to 100 ml for metal …
عرض المزيدConclusion. Direct H 2 SO 4 processing of Egyptian boiler ash to produce sulphate of vanadium and nickel is achieved by leaching under oxygen pressure. Iron is converted to basic iron sulphate which is then hydrolysed to iron oxide. The optimum conditions of pressure leaching process are; temperature 200 °C, partial oxygen …
عرض المزيدIn this study, the Taguchi design method was employed to determine the optimum experimental parameters in extraction of vanadium by NaOH leaching of oil-fired fly. Prior to designed experiments, the raw precipitates were mechanicallly milled using a high-energy planetary ball mill. Experimental parameters were investigated as follows: …
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