PROCEDE DE PREPARATION DE CONCENTRES DE DIOXYDE DE TITANE A PARTIR DE MATIERES ILMENITIFERES

摘要

In the production of a titanium dioxide concentrate from an ilmenite-containing material the ilmenite-containing material is pretreated at about 600 DEG to 900 DEG C. with its Fe(II) : Fe(III) ratio in the range of about 5 : 1 to 1 : 18. An oxidizing atmosphere may be used to bring such ratio within the desired range and further heating may be effected in an inert atmosphere. The ratio may be monitored by measuring the magnetic properties or the X-ray lattice constants during pretreatment and discontinuing such treatment when the magnetic properties or lattice constants reach predetermined values.