C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 23/053 (2006.01) C01B 13/34 (2006.01) C09C 1/36 (2006.01)
Patent
CA 2375623
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°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.
L'invention concerne un procédé hydrométallurgique, permettant de produire des solutions contenant des nanoparticules ou des particules ultra-fines de titane, en particulier des solutions de chlorure de titane. Ce procédé est mis en oeuvre par évaporation totale de la solution, au-dessus du point d'ébullition de ladite solution, et en-dessous de la température permettant une croissance cristalline significative. Il est possible d'ajouter des additifs de régulation chimique de façon à réguler la taille particulaire. Des particules élémentaires de nano-taille sont formées après calcination. Le dioxyde de titane est broyé de façon à libérer des particules élémentaires, et à produire du TiO2 de nano-taille de qualité élevée, à répartition de taille particulaire étroite.
Duyvesteyn Willem P. C.
Prochazka Jan
Sabacky Bruce James
Spitler Timothy Malcome
Altair Nanomaterials Inc.
Smart & Biggar
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