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Waste Management & Research, Vol. 23, No. 2, 148-154 (2005)
DOI: 10.1177/0734242X05052334

Nickel recovery from spent nickel catalyst

Kamala K. Sahu

Non-Ferrous Process Division, National Metallurgical Laboratory, Jamshedpur, India, drkksahu{at}yahoo.com, kksahu{at}nmlindia.org

Archana Agarwal

Non-Ferrous Process Division, National Metallurgical Laboratory, Jamshedpur, India

Banshi D. Pandey

Non-Ferrous Process Division, National Metallurgical Laboratory, Jamshedpur, India

A process for nickel recovery from a spent catalyst of definite composition has been developed using the hydro-metallurgical route. The processing steps includes direct sulphuric acid leaching followed by separation of iron as well as silica and other impurities. For a 152 µm particle size catalyst, extraction of about 98% nickel was achieved at 363 K in 2 h using a sulphuric acid concentration (v/v) of 8% and a pulp density of 10%. The dissolution of nickel followed diffusion-controlled leaching kinetics. Increase in temperature and sulphuric acid concentration resulted in increase in the nickel recovery. The activation energy for nickel dissolution was calculated to be 62.8 kJ mol-1. Finally, nickel was recovered as value-added products such as sulphide and oxalate with overall recovery of 90 and 88% of nickel, respectively.

Key Words: Spent nickel catalyst • leaching • hydro-metallurgical recovery • nickel oxalate • nickel sulphide • wmr 756-4


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