Study of Carbochlorination Selectivity of Hematite in the Presence of Titania

F. C. GENNARI; A. E. BOHE; D. M. PASQUEVICH

Metallurgical Processes for the early twenty-first century

TMS (Minerals, Metals, Materials)

Año: 1994; p. 507 - 519

Chlorination process has been proposed to the treatment of complex and polymetallic minerals. However, very little is known about the interaction between metal chlorides formed durin chlorination and the feasibility of performing selective chlorination of substances composing the mineral. This paper reports a laboratory-scale research to determine the degree to which hematite can selectively be carbochlorinated in the presence of titania. Findings shows that mixture carbochlorination begins at 773 K, but rapidly reaction is stopped. Then, a region of passivity is observed when the reaction temperature increases. This region ranges from 733 to about 820 . At higher temperatures both oxides react with chlorine to produce the respective chlorides. We conclude that hematite is preferentially chlorinated only at temperatures ranging from 820 to 1033 K. Findings of this research are interpreted using TGA, XRD, SEM and TEM.