Appeal No. 1998-2248
Application No. 08/552,407
APPENDIX
1. In a process for the production of titanium dioxide
by chlorination of titanium-containing ore in a fluidized bed
chlorination reactor which includes discharging from the
reactor a mixture comprising metal chlorides and other material
including unreacted titanium dioxide (Ti0 ) and silica (Si0 )2 2
from the ore, and coke, the improvement comprising;
(a) cooling the mixture to form a solid mixture
containing solid particles of
condensed metal chlorides and
titanium dioxide, coke and silica,
(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) and then without any further classification step
returning the recovered titanium dioxide-rich
fraction to the chlorination reactor in a stream
with chlorine-containing gas.
9. In a process for the production of titanium dioxide
by chlorination of titanium-containing ore in a fluidized bed
chlorination reactor which includes discharging from the
reactor a mixture comprising metal chlorides and other
material including unreacted titanium dioxide (Ti0 ) and
2
silica (Si0 ) from the ore, and coke, the improvement
2
comprising;
(a) cooling the mixture to form a solid mixture
containing solid particles of condensed metal
chlorides and titanium dioxide, coke and
silica,
12
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