A study of chromite carbochlorination kinetics

Abstract : The carbochlorination of a chromite concentrate was studied between 500 °C and 1000 °C using boat experiments. The reaction products were analyzed by scanning electron microscopy (SEM), x-ray diffraction (XRD), and chemical analysis. The carbochlorination of a chromite concentrate at about 600 °C led to the partial selective elimination of iron, thus increasing the Cr/Fe ratio in the treated concentrate. Total carbochlorination of the chromite concentrates and volatilization of the reaction products was achieved at temperatures higher than 800 °C. The kinetics of the chromite carbochlorination was studied between 750 °C and 1050 °C using thermogravimetric analysis (TGA). The results were discussed in terms of the effects of gas flow rate, temperature, partial pressure of Cl2+CO, and Cl2/CO ratio on the carbochlorination process. It was observed that the temperature effect changed significantly with the progress of the reaction. The initial stage of the carbochlorination was characterized by an apparent activation energy of about 135 and 74 kJ/mol below and above 925 °C, respectively, while a value of about of 195 kJ/mol was found for the remainder of the carbochlorination process.
Type de document :
Article dans une revue
Metallurgical and Materials Transactions B, Springer Verlag, 1999, 30 (4), pp. 577-587. 〈10.1007/s11663-999-0018-5〉
Liste complète des métadonnées

Littérature citée [4 références]  Voir  Masquer  Télécharger

https://hal.univ-lorraine.fr/hal-01508076
Contributeur : Ndue Kanari <>
Soumis le : jeudi 25 mai 2017 - 14:13:17
Dernière modification le : jeudi 11 janvier 2018 - 06:18:12
Document(s) archivé(s) le : lundi 28 août 2017 - 17:06:15

Fichier

NK_Chromite_CCl.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Ndue Kanari, I. Gaballah, Eric Allain. A study of chromite carbochlorination kinetics. Metallurgical and Materials Transactions B, Springer Verlag, 1999, 30 (4), pp. 577-587. 〈10.1007/s11663-999-0018-5〉. 〈hal-01508076〉

Partager

Métriques

Consultations de la notice

182

Téléchargements de fichiers

85