A novel method for the separation of niobium and titanium from sulfuric acid-oxalate solutions using N235 and MIBK

Sun, Linquan; Yu, Hao; Meng, Fancheng; Qi, Tao; Zheng, Shili; Peng, Yihe; Wang, Lina

doi:10.1016/j.hydromet.2021.105748

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…Comparing the infrared spectral curves of the single-stage extraction-loaded organic phase (c) and the acidified organic phase (b), it can be found that the characteristic peak of Cl − appeared at 622 cm −1 in the single-stage extraction-loaded organic phase, 35 which proves that Cl − exists in the loaded organic phase, that is, the Cl − in the aqueous phase is extracted into the loaded organic phase. 36 Moreover, the absorbance of SO 4 2− at 1221 cm −1 decreases from 0.05 to 0.02. The decrease in peak intensity indicates that SO 4 2− content decreases after extraction, which shows that the exchange of Cl − and SO 4 2− occurs during the extraction process.…”

Section: Resultsmentioning

confidence: 96%

“…35 which proves that Cl − exists in the loaded organic phase, that is, the Cl − in the aqueous phase is extracted into the loaded organic phase. 36 Moreover, the absorbance of SO 37 According to the infrared spectrum curve of the saturated loaded organic phase (d) and single-stage extraction loaded organic phase (c), it can be found that the peak intensity of Cl − at 622 cm −1 does not change significantly, but the peak area increases, indicating that Cl − concentration increases after saturation extraction.…”

Section: Reaction Chemistry and Engineering Papermentioning

confidence: 99%

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Purification of chlorine-containing copper smelting wastewater using extraction-stripping-salting out method

et al. 2023

React. Chem. Eng.

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Section: Resultsmentioning

confidence: 96%

Section: Reaction Chemistry and Engineering Papermentioning

confidence: 99%

Purification of chlorine-containing copper smelting wastewater using extraction-stripping-salting out method

et al. 2023

React. Chem. Eng.

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“…This significantly affects the concentrate grade and product quality. In niobium-containing alloys that are produced via pyrometallurgical processes [3,4] and in niobium oxide that is produced via hydrometallurgical processes [5][6][7][8][9] using Bayan Obo mine materials, the difficulty in separating niobium and titanium leads to low product quality. This severely limits the range of product applications.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Niobium Oxide and Titanium Oxide in NaF–Na3AlF6 Molten Salt

Zhang,

Yu,

Liang

et al. 2024

Metals

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The Bayan Obo ore deposit is a world-renowned polymetallic coexistence mine that integrates important elements, such as rare earths, iron, niobium, and titanium. The chemical properties of niobium and titanium are similar, and the two often coexist in the Bayan Obo deposit as isomorphs, making them difficult to separate. Therefore, the separation of niobium and titanium is crucial for the efficient utilization of niobium resources in the Bayan Obo ore deposit of China. To discuss the feasibility of separating niobium and titanium by selective electrolysis, cyclic voltammetry and square wave voltammetry were used to study the reduction mechanism of niobium oxide and titanium oxide in NaF–Na3AlF6 molten salt. The results revealed significant differences in the diffusion coefficients and reduction steps of Nb5+ and Ti4+ during reduction at a molybdenum cathode. At 950 °C, the diffusion coefficient of Nb5+ during reduction at a molybdenum cathode was 3.57 × 10–6 cm2/s. Also, in the NaF–Na3AlF6 system, Nb5+ underwent a three-step reduction as follows: Nb(V)→Nb(IV)→Nb(I)→Nb. The diffusion coefficient of Ti4+ during reduction at the molybdenum cathode was 9.92 × 10–7 cm2/s, and Ti4+ underwent a two-step reduction in the NaF–Na3AlF6 system: Ti(IV)→Ti(I)→Ti. When Nb2O5 and TiO2 were both present in the NaF–Na3AlF6 system, the deposition potential of niobium metal (−0.64 V) differed from that of titanium metal (−0.77 V). These differences in diffusion coefficient, reduction step, and deposition potential enabled selective electrolytic separation of niobium and titanium.

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“…In the modern hydrometallurgical industry extraction and sorption are widely used to improve the quality of raw materials and products and deep purification of technological solutions [ [10], [11]].…”

Section: Introductionmentioning

confidence: 99%

Studies for hydrometallurgical processing of titanium-magnesium production sludge with niobium extraction in solution

Ultarakova¹,

Karshyga²,

Lokhova³

et al. 2022

KIMS/CUMR/MShKP

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The material composition of sludge deposits from titanium-magnesium production was studied by chemical, X-ray, and microprobe analysis methods. Studies of the phase composition of the collector sludge showed that niobium is mainly bound with aluminum and titanium in oxide compounds. The particles of these compounds are very small and surrounded by the clay and carbonate component of the sludge collector. The chemical and mechanical activation processes of the sludge from the titanium-magnesium production sludge collector were executed based on the data obtained on the material composition. Alkaline leaching of sludge from sludge collector after preliminary activation was executed. The optimum conditions for the niobium extraction from the sludge of the sludge dump from the titanium-magnesium production were determined: sodium hydroxide concentration of 200 g/dm3, glycerol 5 g/dm3, S:L = 1:10, temperature 95 °C, leaching process duration - 4 hours. The addition of glycerol during alkaline leaching of sludge inhibits the transition of hexaniobate into insoluble sodium metaniobate enabling to increase the niobium extraction by 1.3 times with transfer into the solution of up to 80% of the extracted metal.

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A novel method for the separation of niobium and titanium from sulfuric acid-oxalate solutions using N235 and MIBK

Cited by 11 publications

References 43 publications

Purification of chlorine-containing copper smelting wastewater using extraction-stripping-salting out method

Purification of chlorine-containing copper smelting wastewater using extraction-stripping-salting out method

Electrochemical Behavior of Niobium Oxide and Titanium Oxide in NaF–Na3AlF6 Molten Salt

Studies for hydrometallurgical processing of titanium-magnesium production sludge with niobium extraction in solution

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