Appeal No. 1998-2248
Application No. 08/552,407
(b) suspending the solid mixture in an aqueous
suspension,
(c) classifying the solids particles of the aqueous
suspension in a hydrocyclone or hydrocyclones
connected in parallel to create two recovered
fractions one of which is titanium dioxide-rich but
which still contains some quantity of silica and coke;
(d) grinding the recovered titanium dioxide-rich
fraction so that at least about SO % of the
particles of the fraction are smaller than 0.1 mm, and
(e) and then without any farther classification step
returning the ground recovered titanium dioxide-
rich fraction to the chlorination reactor.
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