G - Physics – 01 – N
Patent
G - Physics
01
N
349/37, 204/49.6
G01N 29/02 (2006.01) C25C 3/20 (2006.01) G01H 13/00 (2006.01) G01N 29/036 (2006.01)
Patent
CA 1203614
ABSTRACT This invention teaches a control to be used in smelting aluminum by the electrolysis breakdown of alumina (AL2O3) in a molten electrolyte heated to approximately 950-1000°C. The invention provides a sonic resonator and control that can accurately detect the resonant frequency of the resonator in the molten electrolyte. The resonator preferably is made with tubular side wall 1/4 of the sonic wavelength, or is a quarter wave resonator. A wave generator inputs a single having a range of frequencies that includes the resonant frequency, so that a peak resonant output at the resonant frequency can be detected on an oscilloscope or like detector. This instantaneous resonant frequency is then checked against an accurate data base correlating the resonant frequencies of the resonator in the electrolyte at specific alumina concentrations normally experiences throughout the electrolysis cycle. The electrolysis cycle can thus be controlled and recharged at any predetermined low alumina concentration greater than where the anode effect phase of the cycle normally might begin.
436932
Meredith & Finlayson
United States Of America (government Of The) United States Depar
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