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Control for Aluminum Production and Other Processing Industries
book

Control for Aluminum Production and Other Processing Industries

by Mark P. Taylor, John J. Chen, Brent Richmond Young
October 2013
Intermediate to advanced content levelIntermediate to advanced
252 pages
8h 17m
English
CRC Press
Content preview from Control for Aluminum Production and Other Processing Industries
70 Control for Aluminum Production
TABLE5.1 (Continued)
Common Process Disturbances, Signs, and Responses in Smelting Potlines
Issue/
Mechanism Possible Causes Earliest Signs
Triggers—Stop
Now
Consequences of
Loss of Control
Response to Avoid
the Event
Response (Damage
Limitation)
Low Superheat
(6°C or less)
High metal
height, or shifts
to higher metal
Low bath, hard
crust at anode set.
Swings in
T/AlF3%,
highalumina
feed (cusum)
Not holding bath
level, despite
additions.
Anode ‘bath’
spikes or
deforms
High instability and
power input, with
pots at high
superheat
Detect T/AlF3%
abnormality,
increase power,
reduce metal level.
Reduce alumina
feed ...
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Publisher Resources

ISBN: 9781466514690