Aluminum flouride purity test by different techniques

Abstract

The purity test is one of the key parameter for aluminum fluoride material used in aluminum smelting process. Aluminum fluoride is added to the reduction cell to react with alumina impurities such as CaO and Na2O and to generate more alumina (Al2O3) and cryolite to the reduction cell. Good quality of AlF3, usually having purity between 89 to 93%, has to be measured accurately, through a quick and safe method. This study provides several solutions for measuring the AlF3 purity by instrumental methods such as NMR, XRF dilution, SEM and XRF standard as an alternative for the wet chemical methods. This approach is applicable also for Al2O3/ AlF3 mixed samples.