High solids content titanium dioxide suspension

Details High solids content titanium dioxide suspension High solids content titanium dioxide suspension

C - Chemistry, Metallurgy

01

G

C01G 23/053 (2006.01) C09C 1/36 (2006.01)

Patent

CA 2101042

A finely divided chloride process titanium dioxide prepared without the use of a dispersing agent. The slurry is dewatered via filtration, and the resulting filter cake is made flowable with an anionic dispersing agent. In order to attain a filter cake with very high solids content, the slurry should contain no, or only very few, multivalent anions. The conditions regarding the content of multivalent anions of the slurry are achieved by selection of suitable dechlorinating agents, especially hydrogen peroxide. The filter cake is thixotropic and is made flowable by the fact that it is put into the "diluted" dispersing agent, especially into a part of the titanium dioxide suspension to which the required quantity of dispersing agent has previously been added. Titanium dioxide suspensions with solids content of approximately 78% are thereby obtained and are of particular use in the paper industry.

Divulgation d'un dioxyde de titane traité au chlore finement divisé préparé sans agent de dispersion. La boue liquide est essorée par filtration, et le gâteau de boues résultant est fluidifié au moyen d'un agent de dispersion anionique. Afin d'obtenir un gâteau de boues très riche en solides, la boue liquide ne devrait pas contenir d'anions polyvalents ou n'en contenir que très peu. Les conditions relatives à la teneur de la boue liquide en anions polyvalents sont atteintes par sélection d'agents de déchloration adéquats, en particulier de peroxyde d'hydrogène. Le gâteau de boues est thixotrope et est fluidifié par le fait qu'il est placé dans l'agent de dispersion «dilué», en particulier dans une partie de la suspension de dioxyde de titane à laquelle la quantité requise de l'agent de dispersion a été ajoutée. On obtient alors des suspensions de dioxyde de titane qui contiennent environ 78 % de solides et qui ont une utilisation particulière dans l'industrie papetière.

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