C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
222/9
C25C 3/14 (2006.01) B01J 4/02 (2006.01) B65G 53/22 (2006.01)
Patent
CA 1309987
Abstract A pneumatic dosimeter for exact dosage of pulverulent mate- rials, for instance for supplying aluminium oxide and fluo- ride to an aluminium electrolysis cell, comprises a vessel (1) with an upper chamber (2) which at the bottom is pro- vided with a fluidizing device in the form of a fluidizing canvas (3) with an underlying chamber which is connected to an air source via a pipe line (5). The vessel is provided with an inlet (6) for the supply of pulverulent material from a supply tank or hopper (7) to the upper chamber (2) and an outlet opening for dischanging the chamber (2). At least one fluidizing channel or pipe (9) is provided between the supply tank (7) and the vessel (1), which channel is provided with a fluidizing wall or fluidizing canvas (10) which is connected to an air supply source through a pipe line (12). The filling and emptying of the chamber (2) is carried out by means of solenoid valves (13,14) which are provided on the pipe line (5) for the vessel (1) and the pipe line (12) for the channel (9) respectively and which are governed by means of a PLS governor or a processor such that air is supplied to the channel (g) and the vessel (1) according to a preferred time and frequency programme.
579560
Fetherstonhaugh & Co.
Norsk Hydro A.s
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