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1. WO2004094677 - PROCEDE DE TRAITEMENT DE DECHETS PRODUITS DANS UN PROCESSUS METALLURGIQUE

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

[ EN ]

PATENT CLAIMS

1. A method to improve the filterability of the first fine-grained waste material generated in a metallurgical industry, characterized in that before filtration at least one other fine-grained waste material is added to the first waste material, which has a particle size that is either larger than the particle size of the first waste material, and/or that the particle shape clearly differs from that of the first waste material, and/or that its surface charge is of the opposite sign to the first waste material, and that the materials remain stable in the same kind of conditions.

2. A method according to claim 1 , characterized in that the first waste material is an iron precipitate generated during the fabrication of zinc.

3. A method according to claim 1 or 2, characterized in that the first waste material is jarosite precipitate.

4. A method according to claim 1 or 2, characterized in that the first waste material is goethite precipitate.

5. A method according to claim 1 or 2, characterized in that the first waste material is hematite precipitate.

6. A method according to one of the above claims 1 - 5, characterized in that the second waste material is gypsum precipitate.

7. A method according to one of the above claims 1 - 6, characterized in that the amount of the second waste material to be added is 5 — 50 % of the amount of the first.

8. A method according to one of the above claims 2 - 6, characterized in that the amount of second waste material to be added is 10 - 30 % of the amount of the first.

9. A method according to one of the above claims 1 - 5, characterized in that the particle size of the first waste material is in the region of less than 30 μm.

10. A method according to one of the above claims 1 or 6 - 9, characterized in that the particle size of the second waste material to be added is at least twice as large as the particle size of the first waste material.

11. A method according to claim 1 , characterized in that the first waste material is hydroxide precipitate.

12. A method according to claim 1 and 11 , characterized in that the second waste material is gypsum precipitate.

13. A method according to claim 1 , characterized in that the particle shape of one waste material is spherical and the other needle- shaped.