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. These metals were then concentrated …
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% …
The properties of the fly ash used in this work, collected from the electrostatic precipitator of a power plant burning heavy oil, are reported in Table 1.The high carbonaceous fraction content (around 70%) of the sample makes a preliminary thermal treatment suitable for concentrating the inorganic fraction to be submitted afterwards to …
Metallurgical slags, vanadium processing slams, vanadium-containing quartzites, shales, pitch [16], uranium ore [17], bauxites [18], ash residuals from power units burning heavy oil fractions [19 ...
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.
The fly ash (FA) from the combustion of heavy oil in power stations is characterized by fine particles containing toxic metals. The sample utilized in this study was gathered from the dust precipitators of seven heavy-oil-consuming Iranian power plants. Substantial quantities of heavy metals, particularly vanadium, iron, and nickel, have …
DOI: 10.1016/J.JHAZMAT.2006.02.041 Corpus ID: 24735074; Recovery of gallium and vanadium from gasification fly ash. @article{Font2007RecoveryOG, title={Recovery of gallium and vanadium from gasification fly ash.}, author={Oriol Font and Xavier Querol and Roberto Juan and Raquel Casado and Carmen R. Ruiz and Angel …
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 …
RECOVERY FROM DUSTS AND SLAGS VANADIUM RECOVERY AS FeV FROM PETROLEUM FLY ASH Y. Xiao1, C. R. Mambote2, H. Jalkanen1, Y. Yang1 and R. Boom1 1 2 Department of Materials Science and Engineering, Delft University of Technology Mekelweg 2, 2628 CD Delft, the Netherlands; [email protected] Consultek Research, …
The fly ash produced by oil sands operations in northern Alberta represents a large, high grade, potential resource for vanadium production in Canada. After extensive batch testing, a conceptual process flow sheet for the recovery of vanadium from oil sands fly ash was developed.
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 carbonaceous ...
High energy consumption and metal loss are disadvantages of the pyrometallurgical process for the treatment of vanadium-containing industrial wastes such as fly ash and spent catalyst [110].
The present work focuses on the design of integrated processes for vanadium recovery from oil fly ash. The processes firstly consist in a leaching step, …
At first, the formation of NiFe 2 O 4 by reacting the nickel and iron content of the fly ash was practiced through thermal processing. To determine the optimum roasting condition resulting in the formation of NiFe 2 O 4, different experiments, including roasting followed by acid leaching, were carried out.For roasting with air, 100 g of the sieved fly …
This framework was used to perform a life cycle GHG emissions assessment of a water leaching and salt roasting process to extract vanadium from fly ash. For the upstream GHG emissions, we collected direct emissions data and energy consumption from the literature, and, for the process emissions, we developed a model to estimate energy and ...
Vanadium recovery from oil fly ash by leaching, precipitation and solvent extraction processes
product could be obtained for the further vanadium recovery process. Therefore, 10 g of the oil fly ash C for 4 h. After the carbon removal process, the vanadium concentration in the sample was increased from Fig. 1. Proposed flow sheet of vanadium extraction. Vanadium Recovery from Oil Fly Ash by Carbon Removal and …
The process developed involves a high temperature (875 to 950 °C) roasting of the fly ash in the presence of sodium chloride and water vapor carried out in a rotary screw kiln, followed by dilute sodium hydroxide atmosphereic leaching (98 °C) to solublize about 85 pet of the vanadium originally present in the fly ash.
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 …
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 from the …
Semantic Scholar extracted view of "Valorization of fly ash by nickel ferrite and vanadium oxide recovery through pyro-hydrometallurgical processes: Technical and environmental assessment." by A. Hamidi et al. ... A process for recovering V and Ni from oil fly ash and for making the ash harmless has been developed. More than 80% of V …
This study developed an effective and practical process for recovering vanadium as vanadium pentoxide (V2O5) from spent refinery catalysts. It involves four stages: leaching, purification, precipitation, and calcination. Vanadium was first leached using NaOH; then, the solution was purified by precipitation. Next, vanadium was …
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 …
The process developed involves a high temperature (875 to 950 °C) roasting of the fly ash in the presence of sodium chloride and water vapor carried out in a rotary screw kiln, followed by dilute ...
The 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. Because of particular vanadium migration behaviors, the distribution of vanadium in phases …
Along 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 …
This framework was used to perform a life cycle GHG emissions assessment of a water leaching and salt roasting process to extract vanadium from fly ash. For the upstream GHG emissions, the authors collected direct emissions data and energy consumption from the literature, and, for the process emissions, the authors developed …
Processing of vanadium-containing flyash was investigated by Pickles and Alcock (1983). An extended arc flash reactor was employed to treat a flyash containing about 8% NiO and 42% V 2 O 5. Anthracite and petroleum coke were used as reducing agents. ... The ash was first pre-treated in rectangular steel trays (200×100×30 mm) in a …
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 carbonaceous ...
A 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 …
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 ...
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 …
In this work, vanadium (V) was selectively extracted from fuel-oil fly ash using a leaching process utilizing organic acids extracted from lemon juice with assistance from ultrasound and H2O2. Response Surface Methodology (RSM) was used to optimize the main operating factors. The V recovery was 88.7% at the optimal
Several processes are reported in the literature for extracting vanadium from the fly ashes, such as roasting vanadium bearing materials in the presence of sodium salt, combined with alkaline...
Holloway and Etsell [12,42] reported that the optimum roasting conditions for processing C-free ash from oil sands were determined to be 2-3 h roasting time at 850-900 °C with 20 to 30% NaCl …
