Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Utilizing fused bath
Patent
1997-09-18
1999-03-16
Valentine, Donald R.
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Utilizing fused bath
C25C 306
Patent
active
058824995
ABSTRACT:
The process according to the invention solves the problem of the individual thermal regulation of electrolytic pots. It involves acting on the temperature of the pot by means of the setpoint resistance Ro which is modulated so as to correct the temperature both by anticipation and by reversed feedback. On the one hand, correction by anticipation, known as "a priori" correction allows for known, quantified disturbances and allows their effect on the temperature of the pot to be compensated in advance. On the other hand, reversed feedback correction, known as "a posteriori" correction, involves determining, from direct measurement at regular time intervals of the temperature of the electrolytic bath, a mean temperature corrected as a function of periodic operating procedures and allows the variations and deviations from the setpoint temperature to be compensated. The corrections are made by regular adjustment of a positive or negative so-called additional resistance value which is added to the setpoint resistance Ro of the pot. Correction reversed feedback preferably acts in such a way that, if the corrected mean temperature of the bath is lower than the setpoint temperature, this additional resistance is consequently increased, if the corrected mean temperature of the bath is falling, this additional resistance is also consequently increased, if this corrected mean temperature is higher than the set point temperature, this additional resistance is consequently reduced and if this corrected mean temperature is rising, this additional resistance is also consequently reduced.
REFERENCES:
patent: 3632488 (1972-01-01), Decker et al.
patent: 4333803 (1982-06-01), Seger
Database WPI, Section Ch, Week 8617, Derwent Publications Ltd., London, GB; Oct. 7, 1985.
Bonnardel Olivier
Homsi Pierre
Aluminium Pechiney
Valentine Donald R.
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