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The Cell Lining Replacement
The voltage of the cells is monitored to ensure that the
cells are operating properly. When the voltage in a cell cannot
be maintained at a certain level or within a specified range, it
generally indicates that something is wrong with the cell lining.
In this circumstance, if all other attempts to restore the proper
operation of the cell fail, the cell will be bypassed and removed
from service to have its lining replaced.
When a cell ceases to operate properly and a sample of the
molten aluminum shows an iron content above a certain level, it
is most likely that the cell lining has eroded to expose the
steel collector bars or the shell. At this point, the lining is
burned or eroded to the point where a substantial number of the
cathode blocks are no longer recognizable. If the lining is not
replaced in this circumstance, the cell eventually will rupture
and molten metal will spill onto the floor.
The following materials make up the cell lining: Cathode
blocks made of carbon,3 steel collector bars, refractory brick
made of silicate material, castable refractory, steel plate,
3Cathode blocks make up the bulk of the cell lining. For
instance, each LCD cell requires 8 blocks that are 60 inches by
18 inches by 14 inches, 2 blocks that are 60 inches by 15 inches
by 14 inches, 1 block that is 60 inches by 17 inches by 14
inches, 2 blocks that are 30 inches by 18 inches by 14 inches,
and 2 blocks that are 30 inches by 17 inches by 14 inches.
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Last modified: May 25, 2011