PROCESSO PARA A PREPARACAO DE CONCENTRADOS DE DIOXIDO DE TITANIO

摘要

1. Process for making titanium dioxide concentrates by removing iron and vanadium from material containing titanium oxide and iron and vanadium oxides which comprises : allowing the material containing titanium oxide to travel downwardly under the influence of gravity inside a reaction zone heated to 800 to 1010 degrees C and reacting it which a countercurrently flowing mixture consisting of chlorine and up to 30 volume % inert gas, resulting iron (III) chloride and vanadium oxychloride becoming volatilized and a residue consisting essentially of titanium dioxide remaining behind.