Abstract:In this paper, the content of fluorine in fluorspar was determined by alkaline fusion-distillation-titration method, and the content of CaF2 was calculated. The fluorspar sample is first dissolved by sodium carbonate, then separated by sulfuric acid steam distillation. The fluoride content is determined by titration of thorium nitrate solution with sodium alizarin sulfonate as indicator, then CaF2 calculated. The fluorine form in fluorspar was determined by XRD, and through the test of the using amount of sodium carbonate and sulfuric acid solution, the distillation temperature and time differences, the suitable experimental conditions were determined. The accuracy and precision of this method were also verified by using national standard samples. The RSD of alkaline fusion-distillation-titration method of all samples are less than 0.5%, indicating the method is accurate and reliable, which is worth promoting.