Recovery of Mo, V, Ni and Co from spent hydrodesulphurization catalysts
- Saga Univ. (Japan)
Spent hydrodesulphurization catalysts were roasted and totally dissolved into sulfuric acid solution. The solution contained 2600 Mo, 810 V, 1000Co, 210 Ni, 40 Fe and 12400 Al in ppm. Molybdenum, vanadium, nickel and cobalt were selectively and effectively recovered separately from large amount of solvent extraction technique as follows. Molybdenum, vanadium and iron were coextracted at pH {approx_equal} 1 with 40 vol.% Cyanex 272 reagent in EXXSOL D80 leaving other elements in raffinate. The loaded solvent was scrubbed by 0.5 M sulfuric acid to selectively strip vanadium and iron. Molybdenum was stripped by 6.0 vol.% aqueous ammonia solution to produce ammonium molybdate. The scrubbed vanadium and iron were extracted again with 40 vol.% Cyanex 272 reagent after adjustment of pH to 1.5 by adding calcium oxide. The loaded vanadium and iron were stripped with 6.0 vol.% aqueous ammonia solution and 0.5 M sulfuric acid, respectively. From the raffinate, small amount of nickel and cobalt were consisting of LIX 63 and various acidic extractants.
- OSTI ID:
- 141294
- Report Number(s):
- CONF-930304-; TRN: 93:003688-0970
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
- Country of Publication:
- United States
- Language:
- English
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