For instance a plant processing 16 000 tonnes of fly ash annually recovers 404 tonnes of vanadium pentoxide at $/kg V 2 O 5 Operating expenses constitute 88% of the total recovery cost dominated by labor gas cleaning solid
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 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
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 exchange The first step is leaching with water to dissolve Ni Mg Al and Zn and acid solution is used in the second step to recover V The metals Ni and V are
1 Introduction Fly ash is a solid residue which is collected in off gas treatment system of power plants using heavy fuel oils This residue is an important secondary resource for vanadium after primary resource of the ore concentrates and the metallurgical slag Xiao et al 2010 The production of these fly ashes is of environmental concern Tsai and Tsai 1998 Al
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 mg/l gallium and 35 mg/l vanadium was obtained by leaching with mol/l sulfuric acid These metals were then concentrated by use of a chelating resin
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 been
The invention is addressed to the recovery of vanadium by the treatment of fly ash derived from bituminous or petroleum products such as bituminous schists In accordance with the practice of this invention the fly ash is treated with a concentrated caustic soda solution selectively to solubilize vanadium and in adding calcium oxide to the reacting solution in an amount within
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
Semantic Scholar extracted view of "A study of the extraction of vanadium and nickel in oil fired fly ash" by Shang Lin Tsai et al 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 Expand 42
Hydrometallurgy 2001 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 fraction followed by an acid leaching and an oxidative precipitation of vanadium pentoxide
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 Additional leaching tests
Most of vanadium element remains in the incineration fly ash and its weight composition can reach up to 18 wt% Xiao et al 2010 With the concerns of green chemistry many research works have been done to recover vanadium from fly ash by using a variety of leaching agents Izquierdo and Querol 2012
PhD in Hydrometallurgy & Mineral Processing University of Tehran Cited by 718 Hydrometallurgy Bio hydrometallurgy Recycling Minerals Processing kinetic modelling vanadium and lithium extraction from coal fly ash Sodium salts roasting and organic acids leaching H Rezaei SZ
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 Roast Leach
DOI / 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 L{ o}pez Soler and Pilar Coca and Francisco
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 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 the vanadium recovery
The steadily growing demand for non ferrous metals a shift to heavier crude oil recovery and tightened environmental standards have increased the importance of heavy petroleum feedstock HPF as a raw source of metals This paper reviews the recent developments in the recovery of vanadium and nickel from HPF During crude oil processing
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
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 exchange The first step is leaching with water to dissolve Ni Mg Al and Zn and acid solution is used in the second step to recover V The metals Ni and V are
