Ground calcined alumina for input in a precursor composition...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/02 (2006.01) C01F 7/44 (2006.01) C04B 35/632 (2006.01) C09C 1/40 (2006.01)

Patent

CA 2463566

The invention concerns an additive-containing ground calcined alumina used as constituent of a refractory material precursor characterized in that it comprises an organofunctional silane, the organic function being typically an epoxy function, an alkyl function, an alcohol function or a diol function. Preferably said organofunctional silane is an oxyranyl-alkyl-silane, of chemical formula C¿9?H¿20?O¿5?Si. Said additive-containing alumina can be obtained by adding said organofunctional silane during grinding to take advantage of its anti-caking properties, the intimate and homogeneous mixture being obtained as a result of grinding. It may also result from a post-grinding mixing.

L'invention concerne une alumine calcinée broyée additivée utilisée comme composant d'un précurseur de matériau réfractaire caractérisée en ce qu'elle comporte un silane organofonctionnel, la fonction organique étant typiquement une fonctin époxy, une fonction alkyl, une fonction alcool ou une fonction diol. De préférence ledit silane organofonctionnel est un oxyranyl-alkyl- silane, de formule chimique C9H20O5Si. Cette alumine additivée peut être obtenue en ajoutant ledit silane organofonctionnel au cours du broyage pour bénéficier de ses propriétés anti-mottantes, le mélange intime et homogène étant obtenu grâce au broyage. Elle peut également résulter d'un mélange après broyage.

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