A study of the extraction of vanadium and nickel in oil-fired fly ash

Influence of anthropogenic combustion emissions on the deposition of soluble aerosol iron to the ocean: Empirical estimates for island sites in the North Atlantic

“…In this regard, it is important to note that both vanadium and nickel are highly enriched in crude oil, relative to other metals, as the maturation process leads to the formation of vanadyl-and nickel porphyrin compounds (Aleshin et al, 1984;Lewan, 1984;Amorim et al, 2007;Rana et al, 2007). Hence, the combustion of heavier fuel oil fractions in electrical power plants, heating boilers and ships produce aerosols that are rich in V and Ni (Rahn, 1981;Bacci et al, 1983;Spengler and Thurston, 1983;Mamane et al, 1986Mamane et al, , 2008Divita et al, 1996;Tsai and Tsai, 1998;Li, 2000;Vitolo et al, 2000Vitolo et al, , 2001Wang et al, 2006;Navarro et al, 2007;Seggiani et al, 2007). Indeed, fly ash from power plants burning heavy fuel oil can contain as much as several percent V and Ni by mass ( Table 2).…”

“…Seggiani et al (2007) report that up to 90% of oil fly ash consists of unburned carbon and inorganic oxides of V (0.6-3%), Ni (0.1-1.7%) and Fe (1-5%). In contrast to the more siliceous nature of coal fly ash, particles of oil fly ash tend to be small, vesicular, carbon-rich spheres with highly porous surfaces (Bacci et al, 1983;Mamane et al, 1986;Tsai and Tsai, 1998;Huffman et al, 2000;Vitolo et al, 2000Vitolo et al, , 2001Hsieh and Tsai, 2003;Desboeufs et al, 2005;Jang et al, 2007;Seggiani et al, 2007). Hence, oil fly ash may be characterized as a mixture of Fe, V and Ni oxides in a matrix of amorphous carbonaceous material with a high surface area to weight ratio.…”

A review of metal recovery from spent petroleum catalysts and ash

“…In a study conducted by Tsai and Tsai (1998), three different leaching reactants were tested on porous unburnt carbon, vanadium, nickel oxide and oil-fired fly ash samples. Sulfuric acid, sodium hydroxide, water with ammonia were investigated in leaching of fly ash: 65% of vanadium, 60% of nickel, 42% of iron were recovered by 0.5 N sulfuric acid solution.…”

Improved extraction of vanadium from a Chinese vanadium‐bearing stone coal using a modified roast‐leach process

“…There are numerous studies on the extraction of vanadium from petroleum residues, vanadium‐bearing minerals and metallurgical slag 9. Acid leach is a commonly used process to extract vanadium from heavy oil fly ashes,10–13 vanadium‐bearing clay,14 vanadium‐bearing phosphate ores15 and spent catalysts 16. In some cases, this leach can also be carried out in an alkali solution 2, 11.…”