Light expanded clay aggregates for phosphorus removal

Details Light expanded clay aggregates for phosphorus removal Light expanded clay aggregates for phosphorus removal

B - Operations, Transporting

01

J

B01J 20/12 (2006.01) C02F 1/28 (2006.01) C02F 1/52 (2006.01) C02F 1/58 (2006.01) C02F 3/32 (2006.01)

Patent

CA 2267159

Sintered light expanded clay aggregates are described that are prepared by expanding and firing a clay-based material, and where the finished aggregates have a diameter of up to about 32 mm, for use as filtration medium for purifying water, wherein carbonates of calcium and/or magnesium are added to the clay as flux material prior to expansion and firing. Uses of the expanded clay aggregates for removing phosphorous by utilising the clay aggregates are also described, as well as a method for removing phosphorus by using the clay aggregates.

Agrégats légers frittés en argile expansée qui sont préparés par expansion et cuisson d'une matière à base d'argile. Les agrégats finis ont un diamètre allant jusqu'à 32 mm et sont utilisés comme milieu de filtrage pour purifier de l'eau. Des carbonates de calcium et/ou de magnésium sont ajoutés à l'argile en tant que matériaux de flux avant l'expansion et la cuisson. La présente invention concerne également les utilisations desdits agrégats d'argile expansée pour éliminer le phosphore, ainsi qu'un procédé d'élimination du phosphore à l'aide de ces agrégats.

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