Sahu, K K and Agrawal, A and Pandey, B D (2005) Nickel recovery from spent nickel catalyst. Waste Management & Research, 23 (2). pp. 148-154.
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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 mu m 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.
|Official URL/DOI:||DOI: 10.1177/0734242X05052334|
|Uncontrolled Keywords:||spent nickel catalyst; leaching; hydro-metallurgical recovery; nickel oxalate; nickel sulphide; wmr 756-4|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Sahu A K|
|Deposited On:||14 Jul 2011 17:02|
|Last Modified:||16 Aug 2012 12:00|
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