Silica-calcium carbonate composite particle

C - Chemistry – Metallurgy – 01 – F

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C01F 11/18 (2006.01) D21H 17/67 (2006.01) D21H 17/68 (2006.01) D21H 19/40 (2006.01)

Patent

CA 2400128

Silica-calcium carbonate composite particles, characterized in that they are produced by a method wherein, in a carbonation step of forming calcium carbonate, typically a step of introducing a mixed gas of carbon dioxide and air into a calcium hydroxide slurry with stirring to carry out a carbonization reaction, a synthetic silica such as colloidal silica is added in a period after the start of the carbonization and before carbonization percentage reaches 95 %, the mixed gas is continuously introduced thereafter to continue the carbonization, and the carbonization is stopped when the pH of the slurry reaches 7; a paper having said particles filled therein; and the above method. Said composite particles have both of the characteristics inherent in a synthetic silica and in calcium carbonate, without detriment to the characteristics.

L'invention concerne des particules composites de carbonate de silice-calcium, produites selon un procédé dans lequel, lors de l'étape de carbonation comprenant la formation de carbonate de calcium, généralement une étape consistant à introduire un mélange gazeux de dioxyde de carbone et d'air dans une suspension épaisse à base d'hydroxyde de calcium avec brassage afin de mettre en oeuvre une réaction de carbonation, de la silice synthétique, telle que de la silice colloïdale, est ajoutée après le début de la carbonation et avant que le pourcentage de carbonation n'atteigne 95 %. Le mélange gazeux est introduit de façon continue par la suite afin de poursuivre la carbonation, et la carbonation est stoppée lorsque le pH de la suspension épaisse atteint la valeur de 7. L'invention concerne également un papier renfermant ces particules. Ces particules composites possèdent les deux caractéristiques inhérentes à la silice synthétique et au carbonate de calcium, sans nuire à ces caractéristiques.

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