FREMGANGSMAATE OG ANORDNING FOR ELEKTROKJEMISK MAALING AV KONSENTRASJONEN AV OXIDIONER I ET BAD BASERT PAA SMELTEDE HALOGENIDER.

摘要

The invention relates to a process and a device for measuring subject-matter of the concentration of oxide ions dissolved in a bath based on molten halides. / p & & p & the method is based on a impedancemetry a low current and a low overvoltage, between an electrode points, a reference electrode and an electrode against - / p & & p & will determine the value real zr of the impedance for two frequencies: a low zr (b) 15 - 25 hz, a high zr (h) 10 - 100 khz, the inverse of the concentration of oxide ions is a linear function of the difference between zr (b) and zr (h). / p & & p & the method has a high precision in the low fields of ion concentration of oxide. / p & & p & application to the continuous metering of the alumina in the electrolysis tanks for the production of aluminium.