Vanadium Recovery from Oil Fly Ash by Carbon Removal and Roast-Leach Process

Jung, Myung-Won; Mishra, Brajendra

doi:10.1007/s11837-017-2653-7

Cited by 16 publications

(7 citation statements)

References 8 publications

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“…A three-step process, beginning with carbon burning and followed by salt roasting and water leaching, was conducted on HOFA containing 85 wt% unburned C and 2.2 wt% V. 52 The burning step for 4 h at 650 °C removes the most of carbon and consequently raises the V content up to 19 wt%. Then, the burned ash (enriched with V) is roasted for 4 h at 650 °C with sodium carbonate “Na 2 CO 3 ” in order to convert V oxides to sodium metavanadate “NaVO 3 ” ( eqn (5) and (6) ), which is a water-soluble vanadium compound.…”

Section: Leaching Of V and Ni From Hofamentioning

confidence: 99%

“…Then, the burned ash (enriched with V) is roasted for 4 h at 650 °C with sodium carbonate “Na 2 CO 3 ” in order to convert V oxides to sodium metavanadate “NaVO 3 ” ( eqn (5) and (6) ), which is a water-soluble vanadium compound. 52,53 V 2 O 5 + Na 2 CO 3 = 2NaVO 3 + CO 2 (g) V 2 O 3 + Na 2 CO 3 + O 2 (g) = 2NaVO 3 + CO 2 (g) …”

Section: Leaching Of V and Ni From Hofamentioning

confidence: 99%

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Recovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review

et al. 2023

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Section: Leaching Of V and Ni From Hofamentioning

confidence: 99%

Section: Leaching Of V and Ni From Hofamentioning

confidence: 99%

Recovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review

et al. 2023

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“…Currently, the main sources for vanadium production are titanomagnetite ores [ 12 , 13 , 14 , 15 ]. Additionally, vanadium is extracted from coal [ 16 , 17 , 18 ], fly ash [ 19 , 20 ], spent catalysts [ 21 , 22 ], and other sources [ 23 ]. Titanomagnetite ores are processed to produce vanadium converter slag, from which vanadium pentoxide is obtained by chemical means [ 7 , 12 , 24 , 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hydrometallurgical Methods for Obtaining Vanadium Concentrates from the Waste by Chemical Production of Vanadium Pentoxide

et al. 2022

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The paper describes hydrometallurgical methods to recycle wastes of vanadium pentoxide chemical fabrication. Sludges containing a significant amount of V2O5 can be considered as an additional source of raw materials for vanadium production. We studied the one-stage leaching method using various iron-based reductants for converting V5+ to V4+ in a solution allowing to precipitate V when its concentration in the solution is low. As a result of the reduction leaching with further precipitation, we obtained concentrates with V2O5 content of 22–26% and a high amount of harmful impurities. Multistage counterflow leaching can be used to fabricate solutions with vanadium pentoxide concentration suitable for vanadium precipitation by hydrolysis and adding ammonium salts. The solutions with V2O5 content of ≈15 g/L can be obtained from the initial sludge by three-stage counterflow vanadium leaching. A concentrate with a content of 78 wt% V2O5 can be precipitated from these solutions at pH = 2.4 by adding ammonium chloride. Additionally, concentrate with V2O5 content of ≈94 wt% was precipitated from the solution with a concentration of >20 g/L V2O5 obtained from the roasted sludge. The concentrates were purified for increasing the vanadium content to 5–7%. The consumption and technological parameters of the considered processes are presented in the paper.

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“…The hydrometallurgical methods of ash processing described in the literature are divided into acidic [ 29 , 30 , 31 ], alkaline [ 16 , 32 , 33 , 34 ], and aqueous [ 10 , 22 , 23 , 27 , 35 ]. Beforehand, the material can be roasted using additives.…”

Section: Introductionmentioning

confidence: 99%

Study of Forms of Compounds of Vanadium and Other Elements in Samples of Pyrometallurgical Enrichment of Ash from Burning Oil Combustion at Thermal Power Plants

2022

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The results of the processing of ash from the combustion of fuel oil after roasting with the addition of Na2CO3 followed by aluminothermic melting are presented. As a result, metallic nickel and vanadium slag were obtained. Studies of slag, metal, and deposits on the electrode were carried out. The resulting metal contains about 90 wt% Ni. The main phases of scurf on the electrode are a solid solution based on periclase (Mg1–x–y–zNixFeyVzO), sodium-magnesium vanadate (NaMg4(VO4)3), and substituted forsterite (Mg2–x–yFexNiySiO4). The processing of ash made it possible to significantly increase the concentration of vanadium and convert it into more soluble compounds. Vanadium amount increased from 16.2 in ash to 41.4–48.1 V2O5 wt% in slag. The solubility of vanadium was studied during aqueous leaching and in solutions of H2SO4 and Na2CO3. The highest solubility of vanadium was seen in H2SO4 solutions. The degree of extraction of vanadium into the solution during sulfuric acid leaching of ash was 18.9%. In slag, this figure increased to 72.3–96.2%. In the ash sample, vanadium was found in the form of V5+, V4+ compounds, vanadium oxides VO2 (V4+), V2O5 (V5+), and V6O13, and nickel orthovanadate Ni3(VO4)2 (V5+) was found in it. In the slag sample, vanadium was in the form of compounds V5+, V4+, V3+, and V(0÷3)+; V5+ was presented in the form of compounds vanadate NaMg4(VO4)3, NaVO3, and CaxMgyNaz(VO4)6; V3+ was present in spinel (FeV2O4) and substituted karelianite (V2–x–y–zFexAlyCrzO3). In the obtained slag samples, soluble forms of vanadium are due to the presence of sodium metavanadate (NaVO3), a phase with the structure of granate CaxMgyNaz(VO4)6 and (possibly) substituted karelianite (V2–x–y–zFexAlyCrzO3). In addition, spinel phases of the MgAl2O4 type beta-alumina (NaAl11O17), nepheline (Na4–xKxAl4Si4O16), and lepidocrocite (FeOOH) were found in the slag samples.

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Vanadium Recovery from Oil Fly Ash by Carbon Removal and Roast-Leach Process

Cited by 16 publications

References 8 publications

Recovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review

Recovery of vanadium and nickel from heavy oil fly ash (HOFA): a critical review

Analysis of Hydrometallurgical Methods for Obtaining Vanadium Concentrates from the Waste by Chemical Production of Vanadium Pentoxide

Study of Forms of Compounds of Vanadium and Other Elements in Samples of Pyrometallurgical Enrichment of Ash from Burning Oil Combustion at Thermal Power Plants

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