: KINETICS STUDY OF CARBOTHERMIC REDUCTION OF IRON OXIDES CONTAINED IN MONAZITE CONCENTRATE FOR RARE EARTH EXTRACTION

Kinetics of iron reduction process contained in Brazilian monazitic concentrate has been investigated in this study. Charcoal and petroleum coke were used as reducing agents under isothermal condition. The reduction experiments of monazite concentrate-reductant mixture have been performed at varying temperatures ranging between 973-1273K for 180 minutes. The materials are characterized by representative techniques like XRF, XRD and SEM, in order to evaluate the particles morphology, ore composition and identify the main phase of iron oxide. The isothermal kinetic study has been performed considering the loss of oxygen from the monazite iron oxides calculated from the thermogravimetric. The results showed that charcoal is a better reducer than petroleum coke and that, in both cases, the reaction follows the Ginstling-Brounshtein model for mixed control. The corresponding activation energies using Arrhenius equation are evaluated as 157.68 and 266.95 kJ/mole, for mixtures with charcoal and petroleum coke respectively

Palavras-chave

Monazite concentrate; Iron oxides; Reduction process; Charcoal; Coke petroleum

Como citar

Prada, Ivan Mauricio Daza; Beneduce, Flávio; Ribeiro, Tiago Ramos; Matias, Fabrício Rossi Marques. KINETICS STUDY OF CARBOTHERMIC REDUCTION OF IRON OXIDES CONTAINED IN MONAZITE CONCENTRATE FOR RARE EARTH EXTRACTION , p. 99-107. In: 49° Seminário de Redução de Minérios e Matérias-primas, São Paulo, 2019.
ISSN: 2594-357X , DOI 10.5151/2594-357X-33296