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Minerals 2016, 6(4), 107; https://doi.org/10.3390/min6040107

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

Department of Resources Engineering, National Cheng Kung University, 70101 Tainan, Taiwan
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Academic Editor: William Skinner
Received: 12 September 2016 / Revised: 2 October 2016 / Accepted: 11 October 2016 / Published: 17 October 2016
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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 TiO2 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 WO42 from the solution, because the fraction of two adjacent positively-charged sites on the IRA900 resin was higher and separate from the coexisting VO43−. 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. View Full-Text
Keywords: tungsten recovery; spent SCR catalyst; leaching-ion exchange tungsten recovery; spent SCR catalyst; leaching-ion exchange
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Wu, W.-C.; Tsai, T.-Y.; Shen, Y.-H. Tungsten Recovery from Spent SCR Catalyst Using Alkaline Leaching and Ion Exchange. Minerals 2016, 6, 107.

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