Solubility of B-Nb2O5 and the Hydrolysis of Niobium(V) in Aqueous Solution as a Function of Temperature and Ionic Strength

Peiffert, Chantal; Nguyen-Trung, C.; Palmer, Donald A.; Laval, J.Y.; Giffaut, Éric

doi:10.1007/s10953-010-9495-z

Cited by 44 publications

(31 citation statements)

References 12 publications

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“…The above observations indicate that the dominant species at low HF is fluorinefree and charged. The latter is also suggested by the data of Peiffert et al (2010). Extrapolations of their data to higher temperature predict, albeit with a high degree of uncertainty, that the most abundant hydroxide species for temperatures ≥150 °C is Nb(OH) 4 + (Fig.…”

Section: Identification Of Dissolved Niobium Speciesmentioning

confidence: 56%

“…These estimates should be treated with caution, however, as it is not uncommon them to differ by many orders of magnitude from the stability constants determined experimentally at elevated temperature (e.g., Migdisov and Williams-Jones, 2007). According to Peiffert et al (2010), pH is the main factor controlling niobium hydroxide species solubility in fluoride-free solutions, although it needs to be noted that this conclusion is strictly valid only for temperatures below 70 °C.…”

Section: Introductionmentioning

confidence: 98%

“…However, they did not evaluate the aqueous niobium or tantalum speciation and thus did not determine stability constants that could be used to quantitatively evaluate niobium transport in hydrothermal fluids. The only experimental study that has quantitatively evaluated the stability of niobium species at elevated temperature is that of Peiffert et al (2010), but this study was limited to an investigation of niobium hydroxide complexes at temperatures from 10 ° to 70 °C. Estimates of the stability constants of niobium hydroxide species at elevated temperature are also available from extrapolations of stability constants determined experimentally for these species at ambient temperature .…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of the solubility and speciation of niobium in fluoride-bearing aqueous solutions at elevated temperature

Timofeev

Migdisov

Williams‐Jones

2015

Geochimica et Cosmochimica Acta

137

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Please cite this article as: Timofeev, A., Migdisov, Art.A., Williams-Jones, A.E., An experimental study of the solubility and speciation of niobium in fluoride-bearing aqueous solutions at elevated temperature, Geochimica et Cosmochimica Acta (2015), doi: http://dx. AbstractThe solubility of Nb 2 O 5 and the speciation of niobium in HF-bearing aqueous solutions have been determined at temperatures of 150, 200, and 250 °C and saturated water pressure. At a pH of ~2 and at low HF concentration, niobium is transported primarily as the species Nb(OH) 4 + and at high HF concentration, as the species NbF 2 (OH) 3°. Equilibrium constants for the formation of Nb(OH) 4 + range from -11.23 ± 0.26 to -10.86 ± 0.24 and for the formation of NbF 2 (OH) 3° from -3.84 ± 0.20 to -5.08 ± 0.42, at 150 and 250 °C.The results of this study show that the solubility of Nb 2 O 5 (solid) in aqueous fluids increases with increasing HF concentration, but is not strongly affected by temperature. The influence of pH is variable;at low pH and HF concentration, a decrease in pH increases the solubility of Nb 2 O 5 (solid). At higher pH the reverse may be true. Modeling of the transport and deposition of niobium suggests that simple mixing with a brine is not an effective method for removing niobium from solution. By contrast, interaction of an acidic fluid with carbonate rock results in a rapid reduction of capacity of the fluid to mobilize niobium.

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Section: Identification Of Dissolved Niobium Speciesmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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An experimental study of the solubility and speciation of niobium in fluoride-bearing aqueous solutions at elevated temperature

Timofeev

Migdisov

Williams‐Jones

2015

Geochimica et Cosmochimica Acta

137

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“…16,19,[35][36][37] The species NbO 3 − is a hypothetical species which was mentioned in few solubility studies 38,39 Equilibria involving hexaniobates and other minor species which would be more extractible cannot be excluded, but given the current knowledge on polyoxoniobate chemistry, the extraction of hexaniobates seems the most likely mechanism at a pH higher than ∼10. Therefore, reaction (5) can be considered to be a rational basis to describe the extraction of Nb(V) with methyltrioctylammonium chloride from alkaline media.…”

Section: Solvent Extraction Proceduresmentioning

confidence: 99%

Extraction of Nb(v) by quaternary ammonium-based solvents: toward organic hexaniobate systems

et al. 2016

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“…Waterless HCl electrolyte with tartaric acid was chosen for dissolution of the ferritic matrix. [16][17][18] A separate elemental analysis for inclusions was performed. The surface of a dissolved sample and inclusions on a polycarbonate (PC) filter were studied with a field emission scanning electron microscope (FESEM).…”

Section: Introductionmentioning

confidence: 99%

Determination of Alloying Elements Ti, Nb, Mn, Ni, and Cr in Double-Stabilized Ferritic Stainless Steel Process Sample Using an Electrolytic Extraction Method and Separate Analysis of Inclusions

Sipola

Alatarvas

Heikkinen

et al. 2015

Metall Mater Trans B

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TEIJA SIPOLA, TUOMAS ALATARVAS, EETU-PEKKA HEIKKINEN, and TIMO FABRITIUS Chromium, nickel, and manganese are common alloying elements in stainless steels. Additionally, titanium and niobium are added as microalloying elements to certain stainless steel grades. A double-stabilized stainless steel sample was dissolved in electrolyte using an electrolytic extraction method. Inclusions were separated from the electrolyte with vacuum filtration and put through a separate elemental analysis. Steel-soluble alloying elements were determined from the electrolyte after the extraction, and the elemental analysis of inclusions was performed. The results were compared to the ones obtained from the surface analysis commonly used in the steel industry. It was concluded that the alloying elements were distributed between inclusions and the steel matrix. Therefore, optical emission analysis from a solid steel sample can be misleading. The results might not accurately depict the composition of the steel matrix. Electrolytic extraction methods combined with elemental analysis provide accurate information about the real matrix composition of microalloying elements in steel. The method is also a tool for the simultaneous analysis of inclusions in 3D and soluble alloying elements.

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Solubility of B-Nb2O5 and the Hydrolysis of Niobium(V) in Aqueous Solution as a Function of Temperature and Ionic Strength

Cited by 44 publications

References 12 publications

An experimental study of the solubility and speciation of niobium in fluoride-bearing aqueous solutions at elevated temperature

An experimental study of the solubility and speciation of niobium in fluoride-bearing aqueous solutions at elevated temperature

Extraction of Nb(v) by quaternary ammonium-based solvents: toward organic hexaniobate systems

Determination of Alloying Elements Ti, Nb, Mn, Ni, and Cr in Double-Stabilized Ferritic Stainless Steel Process Sample Using an Electrolytic Extraction Method and Separate Analysis of Inclusions

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