Patent ID: 6803024
Filing Date: 2004-10-12
Classification: C01G,C01P,C22B

Abstract:
A method of treating titania slag to increase the leachability of impurities from the slag comprising the steps of:sizing the titania slag to a particle size from 75 to 850 &mgr;m, wherein the titania slag is produced from beach sand ilmenite; oxidizing the sized slag particles in an oxidizing atmosphere at a temperature from about 700Â° C. to below about 900Â° C. for at least 30 minutes; allowing an anatase phase to stabilize in the slag during the oxidation, allowing the iron present in the slag to concentrate at the exposed surfaces of the slag particles, allowing a major portion of the iron in the Fe(II) state to convert to the Fe(III) state, and allowing the titanium in the Ti(III) state to be converted to the Ti(IV) state; and reducing the oxidized slag in a reducing atmosphere from about 700Â° C. to about 950Â° C. for at least 5 minutes to convert a major portion of the iron in the Fe(III) state to the Fe(II) state.