Srikanth, S and Alex, T C and Premchand, (1999) Reduction roasting of central Indian Ocean nodules by use of fuel oil: a thermodynamic and kinetic analysis. Transactions of the Institution of mining and metallurgy section c-mineral processing and extractive metallurgy, 108 ( ). C138-C146.
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The thermodynamics and kinetics of the reduction roasting of multi-metal central Indian Ocean nodules with fuel oil (neutral oil) were studied by a combination of equilibrium thermodynamic calculations with thermogravimetric and reduction investigations. Oxygen partial-pressure and temperature regimes suitable for the liberation and selective reduction of the copper, nickel and cobalt phases were delineated. The weight loss accompanying the various stages of reduction was deduced from the thermogravimetric results and compared with theoretical calculations. Laboratory-scale reduction-roasting experiments were carried out and the process parameters were optimized. The effect of the extent of reduction on the recoveries of Cu, Ni and Co was studied by leaching in an ammonia-ammonium carbonate medium and also by a metallization test. The process parameters studied were amount of reductant, temperature and time of roasting. Leach recoveries in excess of 96% for Cu and Ni and 85% Co could be achieved with the use of neutral oil under optimum roasting conditions.
|Uncontrolled Keywords:||Thermodynamic and kinetic analysis|
|Deposited By:||Sahu A K|
|Deposited On:||21 Jun 2010 11:33|
|Last Modified:||30 Nov 2011 09:48|
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