Fly ashes resulting from the combustion of fuel containing high concentrations of vanadium that can be slightly removed by water and more efficiently by alkaline or acid solutions.
The correlation between time and nickel separation in the leaching process has also been approved by nickel recovery from power plant fly ash. The time has a very little impact on percentage of ...
Petroleum fly ash is a solid residue generated in the power plants using crude oil and petroleum coke as fuel, which is a valuable resource for vanadium. Stricter environmental regulations and sustainable material utilization demand high vanadium recovery, safer treatment and disposal.
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.
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 involves two-step leaching and ion excha...
In this study, it was aimed to extract vanadium (V) and nickel (Ni) from a petroleum coke ash (PCA) using a roasting process without additives, followed by leaching with sulfuric acid (H2SO4). The experiments were designed based on the Taguchi approach, taking into account the parameters of temperature, acid concentration, time, and solid ratio. …
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 …
This work is the first application of mechanically breaking pore to the flotation separation of unburned carbon and ash from coal gasification fly ash and provides valuable inspiration for the design of porous particles flotation, not limited to the separation of gasification fly ash.
Thus, recovery of vanadium and nickel from heavy fuel fly ash is important from the viewpoint of reclamation of vanadium and nickel which are considered as one of the most hazardous metal species creating serious hydrometallurgical problem in terms of environmental conservation (Amer, 2002).
Petroleum fly ash is a solid residue generated in the power plants using crude oil and petroleum coke as fuel, which is a valuable resource for vanadium. Stricter environmental regulations and sustainable material utilization demand high vanadium recovery, safer treatment and disposal. Several processes are reported in the literature for extracting …
Vanadium is commonly recovered from titaniferous magnetite ores and as V 2 O 5 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 plant, fly ash is predictably enriched in V (up to >6000 mg/kg).
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 ...
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 …
Fly ashes resulting from the combustion of fuel containing high concentrations of vanadium that can be slightly removed by water and more efficiently by alkaline or acid solutions. This uncontrolled release can contaminate water sources and requires appropriate storage of fly ashes. This study investigated the possibility of cleaning the …
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 amounts of heavy metals. However, it contains significant amounts of vanadium "V" and nickel "Ni", which …
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 ...
The paper proposes an environmentally friendly process for recovering germanium, lithium, and vanadium from coal fly ash (CFA) using thermal pretreatment and hydrometallurgy.
Coal fly ash (CFA), an industrial by-product of high-temperature combustion of coal in coal-fired power plants, is one of the most complex and largest amounts of industrial solid wastes generated in China. It is widely recognized that CFA should be considered as a potential alumina resource to substitute bauxite. In this review, the features of high-alumina fly …
Recycling process of fly ash generated from oil burning. Materials Transactions 42, 2465–2471. Miura, K., Nozaki, K., Isomura, H., Hashimoto, K., Toda, Y., 2001b. Leaching and solvent extraction of …
Vanadium Extraction by Carbon Burning and Roast-Leach Processes. Three different steps, such as carbon burning, salt roasting, and water leaching, were conducted to …
Petroleum fly ash is a solid residue generated in the power plants using crude oil and petroleum coke as fuel, which is a valuable resource for vanadium. Stricter environmental regulations and sustainable material utilization demand high vanadium recovery, safer treatment and disposal. Several processes are reported in the literature for extracting …
Vanadium metallurgy is the technology of extracting vanadium compounds from vanadium-containing materials and producing metallic vanadium. ... secondary …
Recovery of vanadium and nickel from this ash is also of economical concern. The fly ash deriving from heavy fuel oil combustion contains appreciable levels of vanadium (up to 13 wt.%) and nickel ...
Al-Ghouti MA, Al-Degs YS, Ghrir A, Khoury H, Ziedan M (2011) Extraction and separation of vanadium and nickel from fly ash produced in heavy fuel power plants. Chem Eng J 173 (2011):191–197
Al-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 Company.
Petroleum fly ash is a solid residue generated in the power plants using crude oil and petroleum coke as fuel, which is a valuable resource for vanadium. Stricter environmental regulations and sustainable material utilization demand high vanadium recovery, safer treatment and disposal. Several processes are reported in the literature for extracting …
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 provided that …
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 alloys. Bioengineering …
Semantic Scholar extracted view of "Extraction and separation of vanadium and nickel from fly ash produced in heavy fuel power plants" by M. Al‐Ghouti et al.
In this investigation a model was developed to predict the synergistic effect of Cyanex 272 and D2EHPA on co-extraction and separation of nickel and vanadium from sulfate leach liquors of power plant fly ash with the aim of increasing separation efficiency. The stoichiometric coefficient of vanadium was determined for sole D2EHPA and three …
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 by use of a …
Request PDF | Recovery of gallium and vanadium from gasification fly ash | The Puertollano Integrated Coal Gasification Combined Cycle (IGCC) Power Plant (Spain) fly ash is characterized by a ...
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 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 …
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 …
In Jordan, large amounts of fly ash (FA) are produced as a result of burning heavy fuel in power plants. Extraction of metals from FA is an important …
Abstract. 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 ...
Petroleum fly ash is a solid residue generated in the power plants using crude oil and petroleum coke as fuel, which is a valuable resource for vanadium.
