Swiss Aluminium Ltd.

Erwin Arnold

Hans Friedli

Edwin Gut

Gottfried Maugweiler

Josef Zengaffinen

A device for accurately controlled feeding of a fine-grained, free-running particulate material from a silo into a reactor vessel, in particular alumina from a day's supply silo to a break in the crust on an aluminium fused salt electrolytic cell, comprises essentially a vertical feed pipe which is situated below the silo and features upper and a lower closing flaps both of which are in the form of segments of a cylinder. The feed pipe mounted on the funnel shaped lower part of the silo features an outlet funnel which joins up with an outlet pipe.

Device for accurately controlled feeding of a fine-grained, free-running

Device and method for breaking open the solidified crust of electrolyte on an electrolytic cell, in particular a cell for producing aluminum. At least one projection is provided on the lower part of the shaft of a chisel used on a crust breaker. After breaking through the crust, the chisel is lowered further at least until the lowest projection or projections reaches the lower half of the crust.

Method of using a chisel for a crust breaking facility

The invention relates to a chisel alignment unit for a facility for breaking the crust of solidified electrolyte on an electrolytic cell, in particular on a cell for producing aluminum. A mechanically stable alignment box extends from the under side of the chisel in its non-working position to the piston rod. The chisel features at least one vertical alignment surface which is in contact with at least one alignment roll mounted on the alignment box by means of roller bearings. A wiper for removing electrolyte from the chisel is mounted below the alignment rolls and extends over the full width of the alignment surface or surfaces.

Chisel alignment unit for a crust breaking facility

The invention relates to a storage bunker for a facility which breaks open the solidified crust on an electrolytic cell. The bunker is subdivided into a large container for alumina and a small container for additives. Below the containers are provided a closing-off plate, a dosing facility and a common outlet pipe leading to the break in the crust. When additives are required, these can be fed directly to the small container via the pipe line for supplying alumina. These are then fed to the cell in measured amounts, if desired, mixed with alumina.

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Venthone, Switzerland

Erwin Arnold