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Nov 13, 2017· 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% vanadium by weight. A vanadium-enriched product was obtained after carbon removal, and the vanadium content of this product was 19% by weight. Next, the vanadium-enriched product was .
Jan 16, 2012· Speciation of vanadium was carried out using a seven‐step sequential extraction procedure of the coal bottom ash each releasing species of vanadium: Water soluble, exchangeable, carbonate, reducible, oxidizable, sulfide, and residual fractions. Total vanadium concentration in the coal bottom ash is 701 mg kg −1 d.w.
Charah disputed Lassiter's interpretation of the Coal Ash Management Act. State lawmakers passed CAMA, as it's known, in 2014, after the Dan River disaster, and amended it in 2016. CAMA was intended to prevent Duke or any public utility from building new — or expanding the existing — unlined coal ash basins or impoundments in North ...
Speciation of vanadium was carried out using a seven‐step sequential extraction procedure of the coal bottom ash each releasing species of vanadium: Water soluble, exchangeable, carbonate, reducible, oxidizable, sulfide, and residual fractions. Total vanadium concentration in the coal bottom ash .
The fly ash produced during the upgrading of the Alberta oil sands contains between 2.0 and 3.5 wt% vanadium, and represents a significant vanadium resource (3.6 million kilograms per year or 3.5% of total world vanadium production). Research was performed to move vanadium recovery from the oil sands fly ash towards commercialization.
The Puertollano Integrated Coal Gasification Combined Cycle (IGCC) Power Plant (Spain) fly ash is characterized by a relatively high content of Ga and V, which occurs mainly as Ga 2 O 3 and as Ga 3+ and V 3+ substituting for Al 3+ in the Al–Si fly ash glass matrix. Investigations focused on evaluating the potential recovery of Ga and V from these fly ashes.
A comparative study of vanadium recovery from titaniferous magnetite using salt, sulphate, and soda ash roast-leach processes S. Nkosi, P. Dire, N. Nyambeni, and X.C. Goso Mintek, Randburg A comparative study of vanadium recovery from titaniferous magnetite (titanomagnetite) using the salt, sulphate, and soda ash roast-leach processes was
Aug 19, 2016· Increasing production and disposal of coal fly ash (CFA) is a matter of serious environment concern. However, CFA contains various beneficial metals and mineral matters whose demand is increasing in the industrialized world, while natural supplies are diminishing. Therefore, recovery of these potential resources from CFA can be an alternative way to save mineral resources, .
@article{osti_22443569, title = {Simultaneous recovery of vanadium and nickel from power plant fly-ash: Optimization of parameters using response surface methodology}, author = {Nazari, E. and Rashchi, F., E-mail: [email protected] and Saba, M. and Mirazimi, S. M.J.}, abstractNote = {Highlights: • Leaching of vanadium and nickel from fly ash (14.43% V and 5.19% Ni) in sulfuric acid was performed.
fine fly ash with a long atmospheric residence time. Vanadium concentrates on the surface of particulate matter from coal combustion. The concentration of vanadium in fly ash from residual fuel-oil burning averages around 8% (range 2-18%), representing 56% (39-74%) of the vanadium concentration in fuel.
preferred route for the recovery of vanadium from the fly ash, due to the relatively low operating and energy cost. The examples include alkali and acid leaching, or roasting then water/alkali/acid leaching followed by purification (solvent extraction or ion exchange) and V2O5 precipitation. As a high
vanadium recovery process and coal - mapguide. stage was an alkaline leaching of fly ash to recover vanadium and molybdenum followed . Recovery of vanadium from heavy oil and Orimulsion . Read 'Recovery of vanadium from heavy oil and Orimulsion fly ashes, Hydrometallurgy' on DeepDyve, the largest online rental service for scholarly research ...
Vanadium recovery from oil fly ash by leaching. Solvent extraction of vanadium and aluminum from Na 2 CO 3 leaching of oil fly ash (top) using Aliquat 336 and vanadium stripping with NH 4 Cl + NH 3 (1.5 M) (bottom) (Experimental conditions: leaching: Na 2 CO 3 (0.66 M), contact time: 24 h, L/S: 4 mL g −1, room temperature; solvent extraction: pre-treatment of leachate with H 2 O 2 and pH ...
Though vanadium recovery was not complete from oil fly ash (with a 70% recovery level), the proposed procedure allowed an efficient, simple and complete recovery of vanadium (greater than 98%) from the leachate in the form of a pure product, that could be valorized. Improving the process would consist in increasing vanadium leaching efficiency.
Vanadium processing, preparation of the metal for use in various products.. Vanadium (V) is a grayish silver metal whose crystal structure is a body-centred cubic (bcc) lattice, with a melting point of 1,926° C (3,499° F). The metal is used principally as an alloying addition to high-strength low-alloy (HSLA) steels and, to a lesser extent, in tool steels and iron and steel castings.
The most abundant form of vanadium in coal bottom ash is residual fraction of vanadium (196 mg kg−1 d.w.). ..., and salt addition on vanadium recovery by salt roasting and water leaching.
A vanadium recovery approach utilizes oil fly ash (OFA), in contrast to coal fly ash, for separation and recovery of vanadium. OFA is first carbon burned to reduce the volume for recycling, and also to provide a fuel for other industrial processes. Following an almost 90% weight reduction from carbon burning, the remaining material includes about 18% vanadium.
RECOVERY OF VANADIUM AND NICKEL FROM PETROLEUM FLYASH Masud A. Abdel-latif Mintek, Randburg, Republic of South Africa Masudal@mintek Key words: Flyash, DC arc furnace, Pre-treatment, Smelting, Vanadium, Nickel, Extraction, Recovery. ABSTRACT Flyash is a powdery residue generated by the power stations that use heavy oil as the
Vanadium recovery of Thermal Power Plant Ash (TPPA) is an attractive process which simultaneously satisfies the pollution control standards regarding TPPA disposal and provides a valuable source ...
A 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.
Recovery 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 ...
Coal ash is a waste product of coal combustion used for electrical power generation. Fly ash (from smoke stacks) and bottom ash (from boilers and combustion chambers) may contain trace metals including aluminum, arsenic, cadmium, chrome, copper, mercury, nickel, lead, selenium, vanadium.
Abstract. Oil fly ash (OFA) is a by-product originated from burning of crude and residual oil for energy. OFA is defined as hazardous waste in many countries because it is acidic
Vanadium and silver extraction from enriched coal sources dates back to the 1800s, and germanium extraction is still active by companies such as Umicore. 1 When coal is combusted, some valuable components can be found in the fly ash captured by the electrostatic precipitators and/or fabric filters commonly applied at coal-fired power plants.
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