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Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminium

A control method and technology for powdery materials, which are applied in the field of dry electrolysis to produce aluminum, and can solve problems such as sensitivity to voltage fluctuations in electrolytic cells

Inactive Publication Date: 2006-11-15
PECHINEY ALUMINUM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that it is sensitive to voltage fluctuations in the electrolytic cell, especially when there is an anode effect

Method used

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  • Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminium
  • Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminium
  • Method and system for controlling addition of powdery materials to the bath of an electrolysis cell for the production of aluminium

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Embodiment Construction

[0027] [27] As in figure 1 As shown above, an electrolytic cell 1 for producing aluminum by dry electrolysis, that is, molten salt electrolysis, includes: a tank 12, an anode 2 and powdery material supply devices 20,30. The anode 2 , usually a prebaked anode made of carbonaceous material, is supported by a rod 3 on an anode beam 9 . The electrolytic cell 12 includes a metal shell 8, usually steel, inner liners 13, 14 and a cathode assembly 5-15. The cathode assembly 5-15 includes a connecting rod 15, called a cathode rod, on which are fixed electrical conductors 16, 17 for delivering electrolysis current Io. The liners 13, 14 and the cathode assembly 5-15 form a crucible inside the tank (12), which is adapted to contain the electrolyte 7 and a layer 6 of liquid aluminum when the cell is in operation.

[0028] [28] A plurality of electrolytic cells are generally arranged in a line and are electrically connected together in series by means of connecting conductors 16,17. The ...

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Abstract

The invention relates to a method for controlling the provision of powdery materials to an electrolysis cell used to produce aluminium by fused-salt electrolysis and provided with at least one distributor for powdery materials and at least one piercing device (30) comprising an actuator (31) and a hammer chipper (33) wherein at least one opening is formed in the crust of the solidified bath with the aid of the piercing device and the powdery material is introduced via at least one opening according to a normal supply method wherein, at a given moment to, an electric signal is generated in order to cause the hammer chipper to descend with the aid of the actuator (31) and the moment t, when the hammer chipper assumes a given low position, is measured, the value of at least one operational indicator for supply F is calculated from the value of the value to and the value obtained for moment t, abnormal or normal operation is determined from at least one operational criterion and the value of the operational indicator(s); if operation is not deemed to be abnormal, the normal supply procedure is maintained; if the operation is deemed to be abnormal, at least one corrective procedure (regularization, normalization) is initiated in order to bring the supply of powdery material into line with normal operation. The inventive method can be automated easily and enables operation of the supply to be monitored even during anode effects.

Description

technical field [0001] [01] The present invention relates to the production of aluminum by dry electrolysis according to the Hall-Héroult method. The invention particularly relates to the control of adding powdery materials to the electrolyte of the electrolytic cell. Background technique [0002] [02] The operation of electrolytic cells that produce aluminum by dry electrolysis of alumina dissolved in a cryolite-based electrolyte results in permanent changes in the composition of the electrolyte. On the one hand the alumina is consumed due to the electrolysis reaction, and on the other hand the amount and composition of the electrolyte gradually changes due to secondary mechanisms such as the absorption of cryolite components by the walls of the electrolytic cell, or due to the anode effect Decomposition of fluoride components. Therefore, alumina and electrolyte compounds such as cryolite (Na 3 AlF 6 ) or aluminum fluoride (AlF 3 ) in order to stabilize the operating p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/14C25C3/20
CPCC25C3/14
Inventor 克洛德·李特尔伯努瓦·舒尔蒙特
Owner PECHINEY ALUMINUM
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