Recovery of Vanadium and Nickel from a High CaCO_3 Containing Petroleum Coke Ash by Roasting and Acidic Leaching. 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 (H_2SO_4). The….
A variety of chemical and physical separation methods have been implemented to extract vanadium and nickel from oil-coming wastes. Chemical separation of fly ash components by thermal processing ...
The metals from the bottom ash were much easier to extract in contrast with the fly ash. For the bottom ash, 71 wt% of Co, 75.69 wt% of Cr, 56.19 wt% of Cd, 35.23 wt% of Ba, 30.2 wt% of Pb, and 5. ...
This can be achieved by selective solvent extraction of V from liquors obtained by ash-leaching. The use of solvents also makes feasible the recovery of V …
Vanadium extraction by Aliquat 336 (60 mM, in kerosene with 5% of isodecanol to prevent the formation of a third phase) was performed with a contact time of 30 min and a Vaq./Vorg. ratio of 1. ... Vanadium …
A large number of studies have been carried outon the extraction of vanadium using ash from thermal power plants as a raw material [11][12][13] [14] [15][16] and few research is devoted the study ...
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 from heavy oil and Orimulsion fly ashes. 10.1016/S0304-386X (00)00099-2. Sitnikova et al, 1990. Role of thermal oxidation in the process of vanadium extraction from refinery coke (solid oil residues). 10.1016/0031-6458 (90)90017-A. As this is a critical review, the authors should have reviewed existing …
Extraction and separation of vanadium (V) and nickel (Ni) from FA is achieved using Akita's procedure with some modifications. In the first step, Ni is …
In order to extract nickel and vanadium from heavy oil fly ash, Tokuyama et al. [31] investigated a process with two different steps; leaching and ion exchange. Al-Ghouti et al. [32] studied extraction and separation of vanadium and nickel from fly ash produced in heavy fuel plants.
Vanadium Extraction by Carbon Burning and Roast-Leach Processes. 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-enriched product could be obtained after carbon removal since the material contained a huge amount of …
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 …
The uranium and vanadium are separated from the liquid by solvent extraction followed by a liquid-liquid ion exchange process which separates the uranium leaving the vanadium in the acid solution. This is subsequently oxidised and removed from the organic salts with soda ash. Vanadium polyvanadate is precipitated by the addition ammonium sulphate.
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 …
The extraction of V and Ni from a petroleum coke ash (PCA) by pyro- and hydro-metallurgical methods, including roasting in the absence of additive and H 2 SO 4 …
The most suitable conditions necessary to leach vanadium ions from fly ash and to recover the vanadium (V) ions using tricaprylyl methyl ammonium chloride as a …
The sintering in high Al, Si ash also affects vanadium extraction using sulfuric acid . On the other hand, roasting the slag with NaOH and leaching it with …
As can be seen, the conventional methods for vanadium extraction used in the processing of titanomagnetite ores, heavy-oil ash, and products of their processing cannot be applied to black shale. Considering the relatively low costs associated with vanadium extraction from shale, the survey of domestic black shale is an urgent task.
The results indicated that leaching of oil-fired fly ash in 0.5 N of sulfuric acid led to an extraction of 65% vanadium, 60% nickel, and 42% iron, along with an increase in the concentration of sulfuric acid. When leached in 2 N sodium hydroxide solution, the extraction of vanadium was 80%, and the extraction of nickel was negligible.
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 …
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 (H_2SO_4). The experiments were designed based on the Taguchi approach, taking into account the parameters of temperature, acid concentration, time, …
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% …
Vanadium remains in the raffinate, which is fed into a second solvent extraction circuit. There vanadium in turn is extracted in the organic phase, stripped with a 10 percent soda ash solution, and precipitated with ammonium sulfate. The ammonium metavanadate precipitate is filtered, dried, and calcined to V 2 O 5.
Environmental Science, Chemistry. 2010. Extraction of vanadium and molybdenum from alkaline leaching solution of boiler ash was investigated. The ash coming from heavy oil-fired electrical power station was leached with 8 mol dm^-3 sodium…. Expand. 3.
Vanadium as a rare element has a wide range of applications in iron and steel production, vanadium flow batteries, catalysts, etc. In 2018, the world's total vanadium output calculated in the form of metal vanadium was 91,844 t. The raw materials for the production of vanadium products mainly include vanadium-titanium magnetite, …
The distribution of vanadium in fly ash became more scattered, and the leaching of vanadium in fly ash was easier than that in stone coal. In order to extract vanadium from fly ash, some leaching agents such as sulfuric acid, hydrochloric acid, alkali and ammonia could be used to dissolve the unsolvable vanadium compounds.
The paper proposes an environmentally friendly process for recovering germanium, lithium, and vanadium from coal fly ash (CFA) using thermal pretreatment and hydrometallurgy. To this end, three sets of experiments were conducted: parameter screening, optimization, and kinetic modeling. The Taguchi method was employed to develop screening tests and …
Vanadium 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. ...
Abstract. One of the principal problems during vanadium recovery from combustion residues is its purification, mainly from iron and nickel. This can be achieved by selective solvent extraction of V from liquors obtained by ash-leaching. The use of solvents also makes feasible the recovery of V from boiler washing water and leaching ponds.
