Alcoa STARprobe™

摘要

Alcoa STARprobe™ is a probe device/system used to measurerncryolitic bath properties including Superheat, Temperature,rnAlumina concentration, and cryolite Ratio (acidity), STAR, allrntogether in real time for active pot control. The proprietaryrnmeasurement principle is based on differential thermal analysisrn(DTA). This paper shows the fundamentals of operation alongrnwith the correlation of all the analysis with the accepted methodsrnof XRD and pyrotitration for acidity, thermocouples for BathrnTemperature and LECO and XRF analysis for alumina. Therntiming of the measurement will be shown to be equal to therntraditional methods and the reliability (including reusable use ofrnthe probes) will also be described.