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Kinetic study of the thermal decomposition of low-grade nickeliferous laterite ores

AuthorsLópez Gómez, Félix Antonio ; Ramirez, M. C.; Pons, J. A.; López-Delgado, Aurora ; Alguacil, Francisco José
Low grade nickeliferous laterite ores
Thermal decomposition
Issue Date2008
CitationJournal of Thermal Analysis and Calorimetry 94 (2) : 517-522 (2008)
AbstractThis study presents an evaluation of the decomposition kinetic of low-grade nickeliferous laterite by thermogravimetric analysis. Kinetic parameters were calculated using the Ozawa and the iso-conversional Friedman methods. Simplified kinetics models like those based on the reaction order were also applied for the simulations. Two-dimensional shrinkage models of the reaction interface mechanism were adopted as describing the thermal transformation process from non-isothermal kinetic analysis. The iso-conversional method (model-free kinetics) reveals that the decomposition of low-grade nickeliferous laterite does not follow a single mechanism because the determined activation energies and pre-exponential factor are not constant during the course of the reaction.
Publisher version (URL)http://dx.doi.org/10.1007/s10973-007-8679-2
Appears in Collections:(CENIM) Artículos
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