Separation and recovery of vanadium from leached solution of spent residuehydrodesulfurization (RHDS) catalyst using solvent extraction |
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| Affiliation: | 1. Research & Development Centre, Sungeel Hi-Tech Ltd., Khajwa-dong, Seo-gu, Incheon 404-250, Republic of Korea;2. Research & Development Centre, KC Cottrell Co., Ltd., Donggyo-dong, Mapo-gu, Seoul 121-898, Republic of Korea;3. Research Institute of Catalyst Technology, Hanseo University, Seosan, Chungnam, 356-706, Republic of Korea;1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No. 1 Bei Er Tiao, Zhong Guan Cun, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;2. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Leached solution, generated by oxalic acid washing of spent residue hydrodesulfurization (RHDS) catalyst, was used for separation and recovery of vanadium. First of all, solvent extraction, using mixture of 20% (v/v) Alamine-336 and 5% (v/v) tri-butyl phosphate (TBP) as a phase modifier, was conducted to extract molybdenum completely at pH 0.50. Then molybdenum-free solution was used for vanadium extraction at pH 1.25 with 20% Alamine-336 and 5% TBP. Stripping of vanadium from loaded organic solution was performed with 1.5 M H2SO4 at O/A phase ratio of 5:1 where more than 99% of vanadium was stripped in two stages. The stripped vanadium solution was further processed by precipitating with ammonium hydroxide to recover ammonium-meta-vanadate which was calcined to obtain vanadium pentoxide. Finally a conceptual process was established for recovery of high purity vanadium pentoxide from oxalic acid leached solution of spent residue hydrodesulfurization (RHDS) catalyst. |
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| Keywords: | Leached solution Organic acid Oxalic acid Solvent extraction Stripping |
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