Fluoride is one of the main components of cryolite and plays a decisive role in its chemical properties. Excessive fluorine content can lead to excessive free fluorine or low valence fluorine in cryolite, affecting its stability and solubility; If the fluorine content is too low, it will lead to excessive non fluoride impurities in the cryolite, affecting its melting aid effect and electrolyte composition. Therefore, accurate determination of fluoride content helps to understand the chemical composition and properties of cryolite.