Title
Chlorination kinetics of an ilmenite concentrate and sequential characterization of obtained materials
Date Issued
01 January 2017
Access level
metadata only access
Resource Type
conference paper
Author(s)
Queiroz C.A.
Suguihiro N.
Souza R.
Navarro R.
Solorzáno G.
Brocchi E.
Pontifical Catholic University of Rio de Janeiro
Publisher(s)
GDMB Verlag GmbH
Abstract
Titanium is a high value metal, both as regards the production of special steels as well as obtaining of TiO2 for white pigment industry. In this context, processes carried out in order to chemically process concentrates containing ilmenite (FeTiO3) have become increasingly important. Therefore, reducing chlorination reactions at high temperatures are an interesting processing route, given the possible formation of TiCl4 in gaseous form. This, in a further step could be transformed in its respective metal through the well-known Kroll Process or oxidized in order to produce its oxide. Alternatively, in the absence of the agent, the process becomes selective, favoring the formation of iron chlorides. Given this outlook, the purpose of the present work is to study the direct chlorination of ilmenite concentrate, aiming to selective extract iron as a volatile chloride varying the flow rate of Cl2 (0.16 - 0.64 L.min-1) and the reaction temperature (873 - 1273 K). The feasibility process was investigated by prior thermodynamic modeling, and the kinetic behavior assessed via mass variation measures as a function of time. Both the starting materials as well as reaction products were characterized by means of XRD, XRF and SEM/EDS. The results suggest, in agreement with the thermodynamic predictions, that the process allows the selective formation of iron chlorides while the titanium content in the concentrate remains unreacted concentrating it in the solid material. From the kinetics perspective, a more relevant weight loss was observed at 1273 K, in fact, suggesting a significant amount of volatile material production. Additionally, for higher flow rates of chlorine in the range between 0.16 and 0.32 L/min resulted in progressively higher reaction rates, indicating for this range a remarkable influence of diffusion factors on the kinetics of the process.
Start page
949
End page
959
Volume
3
Language
English
OCDE Knowledge area
Termodinámica
Subjects
Scopus EID
2-s2.0-85081159800
Resource of which it is part
Proceedings - European Metallurgical Conference, EMC 2017
ISBN of the container
978-394027674-2
Conference
Proceedings - European Metallurgical Conference, EMC 2017. 9th European Metallurgical Conference, EMC 2017
Sponsor(s)
The authors are extremely grateful to CNPq and FAPERJ for the financial support and scholarships as well as Prof. Maria Isabel Pais for her support with the FRX analysis.
Sources of information:
Directorio de Producción Científica
Scopus