Extraction of vanadium from athabasca tar sands fly ash

Gomez-Bueno, C. O.; Spink, D.R.; Rempel, Garry L.

doi:10.1007/bf02654468

Cited by 33 publications

(14 citation statements)

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“…For some samples, very high (50 to 70 pct) and very low salt additions (0 to 10 pct) were tested, which were outside the range of additions reported in earlier testwork. [5,7,11] Very high additions of salt resulted in vanadium extractions approaching 85 to 90 pct, while lower additions show a slight decrease in extraction from roasting without NaCl before increasing to the maximum extractions at the optimum roasting conditions (20 to 30 pct NaCl).…”

Section: A Salt Roasting and Water Leachingmentioning

confidence: 96%

“…[5,6,[11][12][13]16,[20][21][22] One test series was conducted to delineate the effect of carbon on vanadium extraction during salt roasting of the Suncor fly ash ( Figure 4). As-received and "carbon-free" fly ash samples from 1986 were combined to give various nominal carbon contents and salt was added to give a salt addition of 25 pct, based on the total weight of carbon-free fly ash in each sample.…”

Section: Side Reactionsmentioning

confidence: 99%

“…[5][6][7][8][9][10][11][12][13] Vanadium extractions from Suncor fly ash of between 80 and 90 pct were reported, by roasting between 750 °C and 900 °C with salt or soda additions from 10 to 40 pct. Some of these results led to pilot scale testwork at beakers at 95 °C to 97 °C for 1 hour before cooling and filtering the slurry.…”

Section: Introductionmentioning

confidence: 99%

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Salt roasting of suncor oil sands fly ash

Holloway,

Etsell

2004

Metall Mater Trans B

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Fly ash samples from 25 years of Suncor's oil sands upgrading operations were tested to determine the effects of time, temperature, and salt addition on vanadium recovery by salt roasting and water leaching. The optimum roasting conditions for "carbon-free" ash were determined to be 2 to 3 hours roasting at 850 °C to 900 °C with NaCl additions of 20 to 30 pct that resulted in vanadium extractions of 75 to 85 pct for all samples tested. Leach solutions contained less than 150 mg/L Al, Fe, Ni, Si, and Ti and typically analyzed 12-20 g/L V, 0.3 to 0.6 g/L Mo, 3.2 g/L K, and 10 g/L Na. Sodium carbonate (100 g/L) was also a selective lixiviant for vanadium and produced 2 to 7 pct higher extractions than water leaching. Characterization tests showed that most of the mineral matter in the Suncor fly ash is initially present as a poorly crystalline aluminosilicate glass, but crystallizes on heating with NaCl to form distinct aluminosilicate (albite and hauyne) and iron-titanium (pseudobrookite and hematite) phases. Water-soluble vanadium and molybdenum compounds are likely formed by reacting with NaCl during this crystallization. These tests indicate that insoluble vanadium and molybdenum are associated with the aluminosilicates and that nickel is associated with the iron-titanium minerals.

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Section: A Salt Roasting and Water Leachingmentioning

confidence: 96%

Section: Side Reactionsmentioning

confidence: 99%

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Salt roasting of suncor oil sands fly ash

Holloway,

Etsell

2004

Metall Mater Trans B

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“…are desirable. Prior roas-ting and leaching [2,3] followed by solvent extraction is convenient for such purpose. It can build up concentra-tion by using low organic to aqueous phase ratio (O/A) in ex-traction and high O/A in stripping.…”

Section: Introductionmentioning

confidence: 99%

Liquid-Liquid Extraction of V(IV) from Sulphate Medium by Cyanex 301 Dissolved in Kerosene

Biswas¹,

Karmakar²

2013

IJNM

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“…The separation methods include soda roasting and acid leaching. Currently, research is being conducted to investigate soda roasting as it enables the selective separation of the desired metal [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].In soda roasting, NaOH, Na 2 CO 3 , and NaCl are used as leaching agents, and this method is mainly divided into pyrometallurgy and hydrometallurgy [3,4,[6][7][8][9][10][11][12][13][14][15][16][17]. When using Na 2 CO 3 or NaCl as the soda roasting agent, the roasting process is conducted at 900-1200 or 800-900 8C.…”

mentioning

confidence: 99%