Anion exchange of chromium, molybdenum and tungsten species of various oxidation states, providing the basis for separation and purification in HCl solutions

Kékesi, Tamás; Törók, Tamás I.; Isshiki, Minoru

doi:10.1016/j.hydromet.2004.10.012

Cited by 28 publications

(17 citation statements)

References 4 publications

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“…Obviously, the higher pH value was advantageous for the separation of W and V by IRA900 resin. It has been reported that V and W exist as VO 4 3− and WO 4 2− , respectively, at pH 13.5 [21][22][23].…”

Section: Effects Of Ph On Adsorptionmentioning

confidence: 99%

“…V and W exhibit very similar chemical properties and are produced commercially by relatively similar procedures [20]. Therefore, it is difficult to separate V from W. However, in alkaline solution, V and W exist as VO 4 3− and WO 4 2− , respectively [21][22][23]; therefore, the difference in the number of negative charges may be exploited to separate V and W using ion exchange. However, very few reports are available on the recovery W and V from spent SCR catalyst [24].…”

Section: Introductionmentioning

confidence: 99%

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Tungsten Recovery from Spent SCR Catalyst Using Alkaline Leaching and Ion Exchange

Tsai

Shen

2016

Minerals

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Abstract:The recovery of tungsten (W) from a honeycomb-type spent selective catalytic reduction (SCR) catalyst using an alkaline leaching-ion exchange method was investigated. Spent SCR catalyst mainly consists of TiO 2 and other oxides (6.37% W, 1.57% vanadium (V), and 2.81% silicon (Si), etc.). The ground catalyst was leached at the optimal conditions, as follows: NaOH concentration of 0.3 kg/kg of catalyst, pulp density of 3%, leaching temperature of 70 • C, particle size of −74 µm, and leaching time of 30 min. In this study, the leaching rate values of V and W under the above conditions were 87 wt %, and 91 wt %, respectively. The pregnant solution was then passed through a strong base anion exchange resin (Amberlite IRA900). At high pH conditions, the use of strong base anion exchange resin led to selective loading of divalent WO 4 2− from the solution, because the fraction of two adjacent positively-charged sites on the IRA900 resin was higher and separate from the coexisting VO 4 3− . The adsorbed W could then be eluted with 1 M NaCl + 0.5 M NaOH. The final concentrated W solution had 8.4 g/L of W with 98% purity. The application of this process in industry is expected to have an important impact on the recovery of W from secondary sources of these metals.

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Section: Effects Of Ph On Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tungsten Recovery from Spent SCR Catalyst Using Alkaline Leaching and Ion Exchange

Tsai

Shen

2016

Minerals

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“…[36,[38][39][40][41][42][43][44][45][46][47] According to Figure 7, La was not absorbed in the range from 0 to 12 mol L À1 HCl. However, Bi absorption reached extremely high values of about 1 mol L À1 HCl.…”

Section: Elimination Of Bi By Anion Exchange Separationmentioning

confidence: 99%

Preparation and Evaluation of High-Purity La2O3

Lee

Uchikoshi

Mimura

et al. 2010

Metall Mater Trans B

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A separation procedure based on extraction chromatography using the di(2-ethylhexyl) phosphoric acid (D2EHPA) impregnated resin, anion exchange with DIAION SA 10 resin, and oxalate precipitation has been developed for the preparation of high-purity La 2 O 3 in hydrochloric acid media at a high La concentration. The metallic impurities Ce, Pr, Nd, Sm, K, Mg, Ca, Zn, Cu, Co, Mn, Pb, Al, In, and Fe, but not Bi, were removed efficiently from La by extraction chromatography using a D2EHPA impregnated resin. The Bi was separated from the La by anion exchange (DIAION SA 10) separation. Thus, a high-purity LaCl 3 solution was obtained by anion exchange separation and extraction chromatography. La 2 O 3 was prepared from the purified LaCl 3 solution by oxalate precipitation. Glow discharge mass spectrometry was applied for purity evaluation of the prepared La 2 O 3 . The purity of the prepared La 2 O 3 was more than 99.9998 pct total rare earth oxide.

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“…2 The sorption of elements from hydrochloric acid solutions on strong base anion-exchange resins. 8,[28][29][30][31][32][33][34][35][36][37] The separation procedure was devised based on Fig. 2.…”

Section: Experimental Methodsmentioning

confidence: 99%

Modeling of Elution Curves in Preparative Chromatography Using Anion-Exchange Resin for Cobalt Purification

2009

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There have been many studies on the modeling of elution and breakthrough curves of ion-exchange chromatography. A precise representation of elution curves using an appropriate mathematical model is significant for the application and expansion of ion-exchange chromatography. The significance of precise modeling particularly increases when the yield and purity of the product are important. However, no previous studies have proposed a model that can perfectly represent experimental elution curves. We investigated the purification of various metals by anion-exchange separation and determined an optimum condition for purification of an element through trial and error. An appropriate model replicating the elution curves accurately is greatly needed to reduce the testing phase. Consequently, this paper proposes a novel model called the plate theory in multi-path mode, in which three virtual paths are assumed. The results show that this model well represents the experimental elution curves. In addition, the model was validated by comparing the distribution coefficients obtained from the fitting results with those determined by previously reported batch experiments.

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Anion exchange of chromium, molybdenum and tungsten species of various oxidation states, providing the basis for separation and purification in HCl solutions

Cited by 28 publications

References 4 publications

Tungsten Recovery from Spent SCR Catalyst Using Alkaline Leaching and Ion Exchange

Tungsten Recovery from Spent SCR Catalyst Using Alkaline Leaching and Ion Exchange

Preparation and Evaluation of High-Purity La2O3

Modeling of Elution Curves in Preparative Chromatography Using Anion-Exchange Resin for Cobalt Purification

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