Synthetic clay for ceramics and process for preparing the same

Details Synthetic clay for ceramics and process for preparing the same Synthetic clay for ceramics and process for preparing the same

C - Chemistry, Metallurgy

04

B

C04B 33/00 (2006.01) C04B 33/04 (2006.01) C04B 33/24 (2006.01) C04B 35/00 (2006.01)

Patent

CA 2201937

Clay constitutes the three major elements of pottery and porcelain together with silica stone and feldspar. In recent years, however, a good clay having a high plasticity and a low impurity level is being exhausted. The invention provides a synthetic clay rich in water retention and the amount of watery coating formed and possessing plasticity and properties equal or superior to natural clay and a process for preparing the same. The synthetic clay comprises 30 to 65 % by weight of amorphous silica, 30 to 65 % by weight of alumina trihydrate, and 2 to 20 % by weight of at least one of sepiolite, palygorskite, and bentonite. It may be in the form of a slurry, a hydrous clay prepared by dehydrating a slurried synthetic clay, or a mass or dry powder prepared by dehydrating a slurried synthetic clay and drying the dehydrated clay.

L'argile constitue l'un des trois principaux constituants des poteries et de la porcelaine, ainsi que la silice et le feldspath. Mais depuis quelques années les gisements d'argile de qualité sont épuisés. L'invention à trait à une argile synthétique à fort pouvoir de rétention d'eau et de suintement d'eau et offrant une plasticité et des propriétés équivalentes ou supérieures à celle de l'argile naturelle, et à son procédé de fabrication. L'argile synthétique contient en poids: de 30 à 65 % de silice amorphe, de 30 à 65 % de trihydrate d'alumine, de 2 à 20 % de sépiolite, de palygorskite et de bentonite. Elle peut se présenter sous forme de coulis, d'argile hydratée obtenue par déshydratation partielle d'un coulis d'argile synthétique, ou d'argile massive ou en poudre obtenue à partir d'argile hydratée desséchée.

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