Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Involving measuring – analyzing – or testing during synthesis
Patent
1999-03-23
2000-10-03
Bell, Bruce F.
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Involving measuring, analyzing, or testing during synthesis
C25C 320
Patent
active
061268097
ABSTRACT:
A method is described for controlling the supply of aluminium oxide to electrolysis cells for the production of aluminium in which the control is based on measurement of the electrical resistance between the electrodes of the electrolytic furnace and in which the value of this resistance is registered at fixed intervals of time. On the basis of the resistance values registered, at a given time an angle can be calculated between two lines, where one line is formed on the basis of values registered after said time and the other line is formed on the basis of values registered before said time. A curve can be generated on the basis of the angle. By comparison with periods of underfeeding and overfeeding, it is possible to obtain information on the oxide concentration in the electrolysis bath of the cell.
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Bell Bruce F.
Norsk Hydro ASA
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