Method for preparing precipitated silica containing aluminium

Details Method for preparing precipitated silica containing aluminium Method for preparing precipitated silica containing aluminium

C - Chemistry, Metallurgy

01

B

C01B 33/193 (2006.01)

Patent

CA 2432561

The invention concerns a method for preparing precipitated silica comprising reaction of a silicate with an acidifying agent whereby is obtained a precipitated silica suspension, then separating and drying said suspension. The invention is characterised in that said method comprises the following process: adding to the reaction medium at least a compound A of aluminium; then adding to the reaction medium an acidifying agent, said separation comprising filtration and disintegration of the cake derived from said filtration, said disintegration being preferably carried out in the presence of at least a compound B of aluminium. The thus prepared silica precipitates are particularly well adapted for use as reinforcing elastomer filler.

La présente invention a pour objet un procédé de préparation de silice précipitée du type comprenant la réaction d'un silicate avec un agent acidifiant ce par quoi l'on obtient une suspension de silice précipitée, puis la séparation et le séchage de cette suspension, caractérisé en ce que ledit procédé comprend l'opération suivante: on ajoute au milieu réactionnel au moins un composé A de l'aluminium, puis on ajoute au milieu réactionnel un agent acidifiant, ladite séparation comportant une filtration et un délitage du gâteau issu de cette filtration, ledit délitage étant de préférence effectué en présence d'au moins un composé B de l'aluminium. Les silices ainsi préparées sont particulièrement bien adaptées à une utilisation comme charge renforçante pour les élastomètres.

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