Abstract:
A method and means for feeding of material in fluidised state, by means of a silo (1 ) with at least one fluidisable element (3) inside the silo (1 ), in the bottom thereof, where said element, when activated, being able to transport material towards one first outlet and further to a fluidised conveyer (11 ) for controlled dosage via one second outlet (9). The material fed to the first outlet is received by a feeding reservoir formed as a substantially vertical part (5) preferably a cone, that converges downwards onto said conveyor (11 ). Above the reservoir there is arranged one roof (6) that makes the pressure in the material in the reservoir independent of the silo's filling rate.
Abstract:
A method and a station for mixing bulk solid material, in particular for mixing at least two materials (A, B) where at least one of these materials (A) has a broad particle size distribution. The material (A) is homogenized in a first mixer (5a, 5b) before being mixed together with material (B) in a second mixer (7). The material (A) is homogenized in a gravimetric mixer (5a, 5b) with plural chambers and which is discharged in accordance to the mass flow principle. The materials (A) and (B) are preferably mixed in a gravimetric mixer (7) with plural chambers and is further discharged in accordance to the mass flow principle. The material (A) is substantially crushed bath material. The material (B) is primary and/or secondary alumina that mixed with (A) will be used as recycled anode cover material (ACM).
Abstract:
An electrolysis cell producing metals needs to add an accurate amount of feed stock (like alumina) to the cell, and as an effect of the reaction taking place in the cell, one needs to extract the product (like aluminium) and remove any waste product (like HF and CO 2 ). In order to cool the cell properly and to ensure collection of all the effluents from the cell, which is not gas tight, a normal suction is about 100-150 times more ambient air than gas volume produced by the cell. The present invention relates to the principles of how one can extract a more CO 2 - concentrated flue gas from the cell than is standard procedure in the aluminium industry today, by means of distributed pot suction (DPS) devices. In one embodiment the DPS can be integrated with a feeder having a breaker bar for feeding raw material to the cell. Heat energy can be extracted from the hot flue gas.
Abstract:
A method and an equipment for separating solids from a gas flow, in particular separation of a gas-solids mixture deriving from a process plant, such as a pneumatic transport system. The equipment has a main chamber with an inlet section for the mixture and a first outlet for removal of solids form the main chamber. The first outlet is arranged in the bottom part of the main chamber and the main chamber is further having a second outlet for removal of separated gas flow. An annular slit is arranged in the upper part of said main chamber. The second outlet is arranged above said slit. The equipment can advantageously be used in an electrolysis plant for the production of aluminium.
Abstract:
The present invention concerns a method and a device for separating and extracting fractions in a material flow of a material consisting of particles of different fractions. The device comprises a closed conduit (7) with an inlet end and an outlet end through which the material is transported. 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. In use the present invention has proved to be particularly well suited to continuous separation of dust from a fluidisable mass where there is a need for high capacity.