Zirconia in fine powder form, zirconia hydroxycarbonate and...

C - Chemistry – Metallurgy – 01 – G

Patent

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C01G 25/02 (2006.01) C01G 25/00 (2006.01)

Patent

CA 2418016

The invention concerns a zirconia in fine powder form, a zirconia hydroxycarbonate and their methods of preparation. The zirconia has a chlorine content of more than 300 ppm and a sulphur content of more than 30 ppm and is in the form of a powder consisting of medium-size agglomerates of at least 1.5 µm capable of being broken down into medium-size aggregates ranging between 0.1 µm and 0.6 µm. The zirconia hydroxycarbonate has the same chlorine and sulphur contents and is capable of resulting, after calcination, in a zirconia having the above-mentioned characteristics. The inventive zirconia can be used in particular in the manufacture of condensers of oxygen probes or for preparing catalysts.

La présente invention concerne une zircone sous forme de poudre fine, un hydroxycarbonate de zirconium et leurs procédés de préparation. La zircone a une teneur en chlore d'au plus 300 ppm et en soufre d'au plus 30ppm et elle se présente sous la forme d'une poudre constituée soit d'agglomérats de taille moyenne d'au plus 1,5µm désagglomérables en agrégats de taille moyenne comprise entre 0,1µm et 0,6µm. L'hydroxycarbonate de zirconium présente les mêmes teneurs en chlore et en soufre et il est susceptible de conduire, après calcination, à une zircone présentant les caractéristiques données ci- dessus. La zircone de l'invention peut être utilisée notamment dans la fabrication de condensateurs ou de sondes à oxygène ou encore dans la préparation de catalyseurs.

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