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Yanggu, South Korea

Kim H.-I.,Sungeel Hi Technology Ltd. | Lee K.-W.,Sungeel Hi Technology Ltd. | Mishra D.,Sungeel Hi Technology Ltd. | Yi K.-M.,Sungeel Hi Technology Ltd. | And 3 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2015

Alamine-336, diluted with kerosene and iso-decanol, was used for separation of vanadium (IV) and molybdenum (VI) from leached solution generated by oxalic acid washing of spent residue hydrodesulfurization (RHDS) catalyst. The variation of aqueous pH represented that there was complete extraction of both vanadium (IV) and molybdenum (VI) at equilibrium pH 3.8. Both metals were extracted by two stages counter current process using 10% Alamine-336 along with 5% iso-decanol at organic to aqueous phase ratio 1:2. The metal loaded organic was then used for selective stripping of each metal. About 99% of vanadium (IV) and molybdenum (VI) was selectively stripped with 1.5. M sulfuric acid and 2. M ammonia solution, respectively. Both stripped solutions can be further processed for the preparation of respective oxide components of vanadium and molybdenum. © 2014.


Kim H.-I.,Sungeel Hi Technology Ltd. | Lee K.-W.,Sungeel Hi Technology Ltd. | Mishra D.,Sungeel Hi Technology Ltd. | Yi K.-M.,Sungeel Hi Technology Ltd. | And 3 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2014

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. © 2014 Published by Elsevier B.V.

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