Chemistry: electrical and wave energy – Processes and products
Patent
1985-10-03
1988-08-16
Tung, T.
Chemistry: electrical and wave energy
Processes and products
204 67, 204400, 204435, G01N 2746
Patent
active
047642572
ABSTRACT:
A stable reference electrode for use in monitoring and controlling the process of electrolytic reduction of a metal. In the case of Hall cell reduction of aluminum, the reference electrode comprises a pool of molten aluminum and a solution of molten cryolite, Na.sub.3 AlF.sub.6, wherein the electrical connection to the molten aluminum does not contact the highly corrosive molten salt solution. This is accomplished by altering the density of either the aluminum (decreasing the density) or the electrolyte (increasing the density) so that the aluminum floats on top of the molten salt solution.
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"Aluminum/Cryolite Reference Electrodes for Use in Cryolite-Based Melts", John W. Burgman et al, J. Electrochem. Soc.: Electrochemical Science and Technology, pp. 496-500, Mar. 1986.
"Handbook of Chemistry & Physics", 55th ed., pp. B-63 & B-138.
Massachusetts Institute of Technology
Tung T.
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