Method of processing mica

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/40 (2006.01)

Patent

CA 2582111

Disclosed are methods of processing mica, compositions resulting from these methods, and paints comprising the mica. One method relates to a method of processing mica comprising dry attrition grinding a micaceous material to produce a micaceous product having a particle size distribution such that at least about 60% by weight of the micaceous product passes through a 325 mesh screen. The dry grinding can be performed with at least one non-mica grinding media, such as a ceramic ball mill. The methods described herein can use mica from the Spruce Pine Mining District of North Carolina. The methods can allow the use of micaceous materials having a wide range of grit content with minimal adverse effect on the brightness.

L'invention concerne des procédés de traitement du mica, des compositions obtenues par ces procédés et des peintures contenant ce mica. Un de ces procédés est un procédé de traitement du mica, consistant à broyer à sec par attrition une matière micacée pour obtenir un produit micacé présentant une distribution granulométrique telle qu'au moins environ 60 % en poids du produit micacé passe à travers un tamis à maille 325. Le broyage à sec peut être effectué à l'aide d'au moins un corps broyant non micacé, tel qu'un broyeur à boulets en céramique. Les procédés décrits ici peuvent utiliser le mica du district minier de Spruce Pine en Caroline du Nord. Ces procédés peuvent permettre l'utilisation de matières micacées présentant une large gamme de teneur en grains avec un effet négatif minimal sur la brillance.

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