Method and device for measuring the temperature and the level of

Details Method and device for measuring the temperature and the level of Method and device for measuring the temperature and the level of

1995-12-11

2000-05-23

Williams, Hezron

Thermal measuring and testing

Temperature measurement

Of molten metal

374142, 204 67, 73292, 73304R, G01K 1300, G01F 2324, C25C 314

Patent

active

060658673

ABSTRACT:
A method for measuring temperature and electrolyte level of a molten electrolysis bath in a cell for production of aluminum by electrolysis of alumina includes the steps of: (a) piercing the crust of a solidified bath with a crust breaker and immersing into the electrolyte, an extremity of a temperature probe to a sufficient depth until an initial temperature reading of at least 850.degree. C. is measured, then maintaining the immersion of the probe, in said electrolyte for a length of time which is less than the time taken to establish the thermal equilibrium of the probe in the electrolyte, (b) withdrawing the probe and determining a temperature of the electrolyte by extrapolation of the temperature values measured by the probe, (c) measurement of the level of electrolyte in the cell by moving the lower extremity of the probe into contact with the electrolyte while recording potential signals between the cathodic substrate and the probe, and recording position signals corresponding to the position of the probe, and (d) determining the level of the electrolyte by comparison of recorded potential and position signals.

REFERENCES:
patent: 3625842 (1971-12-01), Bristol
patent: 3629079 (1971-12-01), Bristol
patent: 3660256 (1972-05-01), Lippitt et al.
patent: 4124465 (1978-11-01), Schmidt-Hatting et al.
patent: 4563255 (1986-01-01), Heinzmann et al.
patent: 4857157 (1989-08-01), Sulmont et al.
Chemical Abstracts, vol. 97, No. 14, Oct. 4, 1982, Abstract No. 117484, G.A. Dudarev, "Monitoring the Processing State of an Aluminium Electrolytic Cell by Immersing a Metallic Probe into an Electrolyte Melt".
Database WPI, Derwent Publications Ltd., London, GB, AN 87-020961, "Aluminium Redn. Cell Electrolyte Temp. Monitoring-By Simultaneously Measuring Cell Voltage and Current in Given Frequency Range to Apply Formula with Regression Coefficients", Jun. 7, 1986.

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