Sivasakthi, P. and Sathaiyan, N. (2012) Cobalt Recovery from Waste Catalysts (Petroleum Refining Industry from Gujarat). Open Journal of Metal, 2. pp. 24-30.

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A hydrometallurgical process has been developed for cobalt recovery from a waste catalyst (petroleum refining Indus- try). This waste catalyst containing about 2.18 weight % of Co, is highly contaminated by Mg, Al, Si, Ca, Fe, Ni, Cu, Zn, Mo. The major steps are: 1) The spent catalyst is roasted with flux material in an electrical furnace at very high temperature (700°C) for a specific duration; 2) The roasted sample is leached with sulphuric acid to bring the metal con- tents into solution form; 3) For separating cobalt values from the leach solution, the solution pH is raised by NaOH ad- dition, where all cobalt content is precipitated at a pH of about 12; 4) This cobalt hydroxide precipitate is filtered and dissolved in minimum amount of sulphuric acid to get cobalt sulphate solution which is used as the electrolyte for the electrolytic recovery of cobalt. For optimizing various parameters like 1) H2SO4 concentration; 2) Duration; 3) Cobalt concentration; 4) Current density; 5) Temperature; 6) Stirring etc. The particle surface morphology and deposited lay- ers have been characterized by scanning electron microscopy (SEM). A compact metallic deposit containing 70% cobalt was obtained

Item Type: Article
Uncontrolled Keywords: Hydrometallurgical; Electrowinning; Cobalt; Flux Material; Waste Catalysts; H2SO4 Leaching
Subjects: Electrohydrometallurgy
Depositing User: Dr. N Meyyappan
Date Deposited: 03 Jun 2013 13:06
Last Modified: 03 Jun 2013 13:06

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