| 摘要 |
1. A method for separating and extracting fractions in a material flow of a material consisting of particles of different fractions, characterised in that the material is put in a fluidised state by means of at least one fluidisation element (13) located beneath the material and the finer fractions of the material are overfluidised and expelled by means of an extraction device (9) located above the material, the material is conveyed through a closed conduit (7) comprising a separation chamber (17) and an inlet, characterized in that the material is conveyed through a gap between the inlet and the chamber, which provides for hydrostatic feeding and even distribution of the material to the separation chamber. 2. The method in accordance with claim 1, characterised in that the material consists of alumina and/or other equivalent fluidisable materials. 3. A method in accordance with claim 1, characterised in that the material consists of fluoride. 4. The method in accordance with claim 1, characterised in that the finer fractions which are expelled consist of particles of up to 50 micrometres. 5. A device for separating and extracting fractions in a material flow of a material consisting of particles of different fractions, characterised in that it comprises a closed conduit (7) with an inlet end and an outlet end through which the material is transported, and where a separation chamber (17) is mounted between the inlet end and the outlet end, the separation chamber comprises at least one fluidisation element (13) at the base of the chamber and an extraction device (9) located in the upper part of the chamber, characterized in that, the distribution chamber (6) comprises a vertical partition (16) which ends above the base (10) of the distribution chamber so that a gap (18) is formed through which the material is conveyed into the separator chamber (17). 6. The device in accordance with claim 5, characterised in that the base (10) of the distribution chamber (6) is located lower than the base (11) of the separation chamber (17) so that a threshold (19) is formed between them. 7. The device in accordance with claim 5, characterised in that the extraction device (9) is designed with a gap-shaped aperture (20) which extends downwards and into the separation chamber (17).
|
