De-icing composition and method for making same

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 3/18 (2006.01)

Patent

CA 2232013

This composition consists of a coated composition (14) of solid ice melting agents, abrasives and absorbents. The coated composition (14) employs a coating of calcium chloride. The method of making the composition, also part of the invention, includes placing a solid ice melting agent such as urea, potassium chloride, sodium chloride and abrasives such as sand, gravel, cinders, and absorbents (i.e. calcined diatomaceous earth) into a mechanical stirring device; and spraying a measured amount of adhering solution on to the medium. This adhering solution (12) may be made up, but not limited to, plain water, solutions of organic or inorganic solids with ice melting properties, etc. To this mixture is added a measured amount of powdered non-fully hydrated calcium chloride as a solid coatant. The non-fully hydrated calcium chloride by hydration forms a coating around the ice melt base. The resultant mixture is discharged from the mixer, screened and packaged.

Cette composition est constituée d'un agent de revêtement (14) appliqué sur des agents solides permettant la fusion de la glace, des abrasifs et des absorbants. L'agent de revêtement (14) est le chlorure de calcium. Le procédé pour réaliser la composition, également partie de l'invention, consiste à introduire un agent solide permettant de fondre la glace tel que l'urée, le chlorure de potassium, le chlorure de sodium et des abrasifs tels que le sable, le gravier, les cendres et des absorbants (terre de diatomées calcinée) dans un mélangeur mécanique; et à pulvériser une quantité mesurée de solution adhérente sur cette préparation. Cette solution adhérente (12) peut être réalisée, entre autres, avec de l'eau ordinaire, des solutions de matières solides organiques et minérales capables de fondre la glace, etc. A ce mélange, on ajoute une quantité mesurée de chlorure de calcium en poudre incomplètement hydraté, en tant qu'agent de revêtement solide. Le chlorure de calcium incomplètement hydraté forme par hydratation un revêtement autour de la base pour fondre la glace. Le mélange résultant est évacué du mélangeur, tamisé et conditionné.

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