Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. WO2007103391 - PROCEDE CONCENTRE D'ALUMINOSILICATES A ECHANGE IONIQUE ET UTILISATION POUR L'ADSORPTION DE PHOSPHATE ET D'OXYANION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A method of adsorbing phosphorous-containing or oxyanion pollutants onto an ion-exchanged aluminosilicate comprising contacting said pollutants with the ion-exchanged aluminosilicate, wherein the aluminosilicate has been ion-exchanged by intimately mixing the aluminosilicate with water having a dissolved complexing element contained therein, wherein the water content is in the range of about 15% to about 50% by weight, based on the total weight of aluminosilicate and water, and wherein the complexing element is selected from the group consisting of lanthanides, Group IB, IIB, IIIB, IVB, VIII, and mixtures thereof.

2. The method of claim 1, wherein the complexing element is selected from the group consisting of Group IB, IIB, VIII, and mixtures thereof.

3. The method claim 2, wherein the complexing element is selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), and mixtures thereof.

4. The method of claim 1, wherein the complexing element is present in contact with the aluminosilicate during ion-exchange in an amount no more than about 10% in excess of the ion-exchange capacity of the aluminosilicate.

5. The method of claim 1, wherein the aluminosilicate is selected from the group consisting of montmorillonite, smectite, beidelite, nontronite, saponite, bentonite, attapulgite, sepiolite, hectorite, vermiculite, palygorskite, zeolite and mixtures thereof.

6. The method of claim 4, wherein the aluminosilicate is acid-activated by treatment with an acid selected from the group consisting of HCl, HNO3, H2SO4, H3PO4 and mixtures thereof.

7. The method of claim 1, wherein the complexing element is dissolved from a water-soluble salt of the complexing element.

8. The method of claim 7, wherein the water-soluble salt is a chloride salt, a nitrate salt, or a mixture of chloride and nitrate salts of the complexing element.

9. A method as claimed in claim 1 wherein the ion-exchanged aluminosilicate is applied as a dry powder, as pellets, as a granular material, or as a wet slurry to the surface of a water body.

10. A method as claimed in claim 1, wherein the ion-exchanged aluminosilicate is applied directly to a surface of bottom sediments of a water body.

11. A method as claimed in claim 1, wherein the ion-exchanged aluminosilicate is applied directly to a surface of a water body.

12. A method as claimed in claim 1 , wherein the ion-exchanged aluminosilicate is applied beneath a surface of a water body and above a surface of bottom sediments of the water body.

13. A method as claimed in claim 1 wherein the ion-exchanged aluminosilicate is injected into bottom sediments of a water body.

14. A method as claimed in claim 1 wherein the ion-exchanged aluminosilicate forms a capping layer over the surface of bottom sediments of the water body.

15. A method as claimed in claim 14 wherein the capping layer has thickness between 0.1 mm and 50 mm.

16. A method as claimed in claim 1 wherein the ion-exchanged aluminosilicate is sandwiched between geotextile layers.

17. A method as claimed in claim 1, wherein the aluminosilicate has a cation exchange capacity (CEC) of greater than about 30 milliequivalents per 100 grams (Meq/100 g)-

18. A method as claimed in claim 17 wherein the aluminosilicate has a cation exchange capacity (CEC) of greater than about 70 meq/100 g.

19. A method as claimed in claim 1, wherein the water content is in the range of 20 - 40% by weight during ion-exchange.

20. A method as claimed in claim 19, wherein the water content is in the range of 5 - 35% by weight during ion-exchange.

21. A method as claimed in claim 20, wherein the water content is in the range of 30 - 35% by weight during ion-exchange.

22. A method as claimed in claim 1, wherein intimate mixing during ion-exchange is achieved in an apparatus selected from the group consisting of an extruder, a pug mill, a pin mixer, and a mixer extruder.

23. A method as claimed in claim 1, wherein the weight ratio of the weight of the compound dissolved to provide the dissolved complexing element to the weight of the aluminosilicate, during ion-exchange, is less than 1.0.

24. A method as claimed in claim 23, wherein the weight ratio of the weight of complexing compound dissolved in water to the weight of the aluminosilicate, during ion-exchange, is less than 0.5.

25. A method as claimed in claim 24, wherein the weight ratio of the weight of complexing compound dissolved in water to the weight of the aluminosilicate, during ion-exchange, is less than 0.1.

26. A method as claimed in claim 25, wherein the weight ratio of the weight of complexing compound dissolved in water to the weight of the aluminosilicate, during ion-exchange, is in the range of 0.02 to 0.06.