An extraction of 98.6% was observed, and a highly pure strip solution was produced by stripping the loaded organic with strong caustic solution. Sulfuric acid leaching is more commonly used for extraction of vanadium from its mineral sources, but alkaline leaching can have many benefits relative to acid leaching, including
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Abstract A cleaner method featuring non-salt roasting and ammonium bicarbonate leaching has been studied for the extraction of vanadium from vanadium slag. Compared to the traditional alkaline salt roasting followed by water leaching process, chromium spinel in the raw vanadium slag will not be converted to carcinogenic chromate salts and exhaust gas will not be produced in the non-salt ...
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Extraction of vanadium from this resource has been studied, extensively, over the past decade, especially, for the leaching and purification process [15, 29, 30]. Acid leaching, followed by ...
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The new process of vanadium extraction from molten vanadium slag by direct oxidation and sodium activating method is reasonable and feasible. The experimental results show that in the new process, vanadium in the roasted slag exists mainly in the form of water-soluble sodium vanadate and the vanadium water leaching efficiency can reach to 80%,
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Vatolin N.A., Khalezov D., Inanimate, VA, Leontiev L.I.], including the leaching of vanadium-containing material with obtaining alkaline vanadium-containing solution and the extraction of vanadium by mixing strong soda vanadium-containing solutions with monohydroxy alcohols, followed by separation of the solution into two phases: the top ...
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The dissolution kinetics of vanadium from spent hydroprocessing catalyst was investigated by leaching with sulfuric acid at atmospheric pressure. The effects of stirring speed (400-800 rpm), initial sulfuric acid concentration (0.60-1.20 mol/l) and reaction temperature (373-423 K) on the vanadium dissolution were studied.
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The main difference is time, with the standard process method takes about 4 days from start to finish while the heap leaching process take about 200 days, with the same types of minerals breaking down to supply the vanadium. The heap leach process just accomplishes that over a longer period of time.
ChatA method ( 10 ) for the extraction and recovery of vanadium from its ores, the method ( 10 ) characterised by the steps of: (i) Acid leaching ( 12 ) of an ore containing vanadium and iron to extract vanadium and iron into solution; (ii) Passing the product ( 78 ) of the leach step (i) to a solid/liquid separation step ( 80 ); (iii) Passing the liquid product ( 82 ) of separation step (ii) to a ...
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These vanadium-containing materials can be treated by a great deal of processes such as calcium reduction, roasting/leaching, solvent extraction, and ion exchange for extraction of vanadium either as a pure metal, ferrovanadium, or in the form of vanadium pentoxide and other inorganic vanadium compounds [2, 9].
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A process has been developed at the laboratory scale for leaching of vanadium from a vanadium residue using mixed hydrofluoric and sulfuric acid solutions, and NaClO as an oxidant.
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Extraction of vanadium from spent oil hydrotreating catalyst by acid leaching under atmospheric pressure or by pressurized acid leaching is an innovative hydrometallurgical technology, which attracts more and more attention due to its high recovery ratio of vanadium and low environmental pollution (Cai et al., 2013; Cheraghi et al., 2015; El-Nadi et al., 2009; Kim et al., 2014; Luo et al., 2020; Nguyen and Lee, 2014).
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The vanadium occurrence in stone coal, water leaching, and acid leaching residue was investigated by energy dispersive spectrometer (EDS) mapping and point analysis, and the vanadium transitions during roasting-leaching of stone coal were revealed. In the roasting process, vanadium-bearing muscovite is converted to K-Na-feldspar, accompanying the liberation of vanadium. Most liberated vanadium ...
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The desilication efficiency and efficiency of vanadium loss in the overall purification process were 99.9% and 5.8%, respectively. The impurity concentrations (Si:Al and As) in the final purified liquor were low, and these concentrations will not affect the subsequent processes. Solvent extraction Extraction and stripping processes were ...
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Abstract 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 selective precipitation.
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verted into spinel in vanadium slag.24) Consequently, a new type of vanadium slag with high chromium content (820 mass%) is produced and represents a potential source of chromium. A problem is however the lack of effective chro-mium extraction method with high recovery percentage. The commonly-used chromium extraction route based on
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An extraction process to recover vanadium from low-grade vanadium-bearing titanomagnetite was developed. In this study, a mixed solvent system of di(2-ethylhexyl) phosphate (D2EHPA) and tri-n-butyl phosphate (TBP) diluted with kerosene was used for the selective extraction of vanadium from a hydrochloric acid leaching solution that contained low vanadium concentration with high concentrations ...
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To extract vanadium in an environment friendly manner, this study focuses on the process of leaching vanadium from vanadium slag by high pressure oxidative acid leaching. Characterizations of the raw slag, mineralogy transformation, and the form of leach residues were made by X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The result shows that the ...
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Results show that the leaching extent of vanadium was 92.98% when the calcification roasted materials were treated with 80 g/L NaHCO 3 solution and leached at 100 °C for 120 min. Additionally, only 1.84% silicon, 0.05% chromium, 0.06% iron, and 0.05% manganese were co-leached along vanadium, meaning that an effective selective vanadium extraction was achieved. The leaching solution was treated with thioacetamide (TAA) in a hydrothermal reaction at 140 °C for 16 h, which resulted in a ...
ChatThe fundamental understanding of vanadium hydrometallurgy was developed in three phases: vanadium (V) leaching, vanadium (III) oxidative leaching, and solvent extraction of vanadium (V&IV). In the first section, VO leaching was studied in three steps. First, vanadium leaching and solubility of VO⁺ at different pHs and temperatures were investigated in sulfuric acid. Secondly, the ...
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The result shows that the vanadium slag is composed of major phases of fayalite, titanomagnetite, and spinel. During the high pressure oxidative acid leaching process, the fayalite and spinel phases are gradually decomposed by sulfuric acid, causing the release of vanadium and iron in the solution.
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Abstract A cleaner method featuring non-salt roasting and ammonium bicarbonate leaching has been studied for the extraction of vanadium from vanadium slag. Compared to the traditional alkaline salt roasting followed by water leaching process, chromium spinel in the raw vanadium slag will not be converted to carcinogenic chromate salts and exhaust gas will not be produced in the non-salt ...
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For the process of vanadium extraction from stone coal, the vanadium recovery by the roasting-leaching procedure is around 6575%, while for other procedures, such as ion exchange, solvent extraction, and vanadium precipitation, the vanadium recoveries are more than 97% [9,10]. Therefore, the total vanadium recovery depends on the vanadium recovery of the roasting-leaching step [11].
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