PROCESSING AQUEOUS TITANIUM CHLORIDE SOLUTIONS TO ULTRAFINE TITANIUM DIOXIDE

摘要

The invention provides a process for producing ultrafine titanium dioxide from a titanium chloride solution comprising: a. adding a chemical control agent to the titanium chloride solution to form a feed solution; b. hydrolyzing the feed solution to form titanium oxide particles by spray drying at a temperature above the boiling point of the solution and up to 350.degree.C; c. calcining the hydrolyzed product to form titanium dioxide; and, d. milling the calcined product to liberate nano-sized particles. The invention also provides a process for producing ultrafine titanium dioxide having a particle size less than about 100 nanometer from an aqueous titanium chloride solution comprising: a. adding a chemical control agent to the titanium chloride solution to form a feed solution; b. hydrolyzing the feed solution to form titanium oxide particles in a controlled temperature, evaporation process at a temperature higher than the boiling point of the solution but lower than the calcination temperature of the product; c. calcining the hydrolyzed product to form titanium dioxide; and, d. milling the calcined product to liberate elemental nano-sized particles.