Expanded perlite annealing process

C - Chemistry – Metallurgy – 03 – B

Patent

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Details

C03B 25/00 (2006.01) B28B 1/093 (2006.01) B28B 1/50 (2006.01) B28B 11/24 (2006.01) C03C 12/00 (2006.01) C04B 38/08 (2006.01) C01B 31/12 (2006.01)

Patent

CA 2671672

This invention is directed to a method of reducing the water demand of expanded perlite that includes obtaining a vibrating screen supported at an angle and placing expanded perlite on the vibrating screen. The expanded perlite is moved over the screen past toward a burner at a rate that heats the expanded perlite to a temperature sufficient to anneal it. The expanded perlite is then moved away from the burner and allowed to cool. Another embodiment of this invention is directed to a method of making a gypsum product. The method includes annealing perlite by the method described above, then preparing a slurry of calcium sulfate hemihydrate, additives, water and the annealed perlite. The slurry is formed into the shape of the gypsum product and allowed to set. This process is particularly useful in making gypsum panels and acoustical panels that benefit from the use of lightweight materials.

Cette invention concerne un procédé de réduction de la demande en eau de la perlite expansée qui comprend l'obtention d'un écran de vibration soutenu à un angle et le placement de la perlite expansée sur l'écran de vibration. La perlite expansée est déplacée sur l'écran au-delà d'un brûleur à une vitesse qui chauffe la perlite expansée à une température suffisante pour la recuire. La perlite expansée est ensuite retirée du brûleur et laissée refroidir. Un autre mode de réalisation de l'invention concerne un procédé de préparation d'un produit à base de gypse. Le procédé comprend le recuit de la perlite par le procédé décrit ci-dessus, puis la préparation d'une suspension d'hémihydrate de sulfate de calcium, d'additifs, d'eau et de la perlite recuite. La suspension est mise en forme sous la forme du produit à base de gypse et est laissée durcir. Ce procédé est particulièrement utile pour préparer des plaques de plâtre et des panneaux acoustiques qui tirent profit de l'utilisation de matériaux légers.

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