Separation and recovery of rare metals from spent hydrodesulfurization catalysts by solvent extraction
- Saga Univ., Honjo, Saga (Japan). Dept. of Applied Chemistry
- Catalysts and Chemicals Industries Co., Ltd., Kitakyushu (Japan)
The sulfuric acid leaching of spent hydrodesulfurization catalysts yields an acidic solution rich in rare metals such as molybdenum, vanadium, cobalt, and nickel in addition to aluminum. For the purpose of separating and recovering the rare metals from the solution, basic solvent extraction characteristics of the metals involved with commercially available acidic organophosphorus reagents like TR-83, PC-88A, PIA-8 and CYANEX 272 as well as aliphatic alpha-hydroxyoxime LIX 63 from sulfuric acid media were investigated in the present work. It was demonstrated that CYANEX 272, PIA-8 and LIX 63 possessed excellent selectivity for molybdenum and vanadium over the other metals at comparatively low pH. Further, recovery of molybdenum and vanadium from the total leach liquor by the selected extractants was discussed. Additionally, in order to achieve preferential separation and recovery of cobalt and nickel over an appreciable amount of aluminum from the raffinate obtained after recovering molybdenum and vanadium, a systematic investigation was conducted on synergistic extraction behaviors of the mixed solvents of LIX 63 in combination with a series of acidic extractants such as CYANEX 272, PIA-8, PC-88A, D{sub 2}EHPA, TR-83 and OPEHPA for cobalt, nickel and aluminum. It was elucidated that all of these mixtures could exhibit a good synergistic effect for extraction of cobalt and nickel, and that the lower the pKa of the acidic extractants, the greater the synergism. Contrarily, the extraction of aluminum, was considerably suppressed by LIX 63. Effective extraction of cobalt and nickel away from aluminum was accomplished from the sulfate solution at low pH (1.0--2.5) with the mixtures.
- OSTI ID:
- 197261
- Report Number(s):
- CONF-951105-; ISBN 0-87339-318-X; TRN: IM9612%%35
- Resource Relation:
- Conference: 3. international symposium on reycling of metals and engineered materials, Point Clear, AL (United States), 12-16 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of Third international symposium: Recycling of metals and engineered materials; Queneau, P.B. [ed.] [Hazen Research, Inc., Golden, CO (United States)]; Peterson, R.D. [ed.] [Reynolds Metals Co., Muscle Shoals, AL (United States)]; PB: 1048 p.
- Country of Publication:
- United States
- Language:
- English
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