Apparatus for determination of aluminium oxide content of...

G - Physics – 01 – N

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G01N 27/58 (1985.01)

Patent

CA 1230923

ABSTRACT An apparatus for determination of aluminium oxide content of the cryolite melt in aluminium electrolysis cells includes an oxygen ion conducting solid electrolite containing oxygen galvanic cell equipped with a reference electrode of given oxygen potential arranged in a zirconium oxide tube closed on one end and with a measuring electrode covered with aluminium. The reference elec- trode is a cryolite melt supersaturated with Al2O3. The aluminium coating of the measuring electrode is the aluminium melt in the cell into which the conductor of the electrode protrudes. The conductor of the measuring electrode has a boron nitride protective coating.

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