Behavior of Fluorine Dissolution from Hot Metal Pretreatment Slag

Abstract

Based on the results for the time dependence of F, Ca, Si and Al amount dissolved from hot metal pretreatment slags, the behavior of fluorine dissolution has been examined. It was found that the amount of fluorine dissolved from hot metal pretreatment slag depends on CaO/SiO₂ mass ratio and fluorine content in slag. This trend is obvious in the case of synthetic slags. Fluorine ion in solution is incorporated into CaO-SiO₂-H₂O and CaO-SiO₂-Al₂O₃-H₂O gels during the formation of these gels. Therefore, it was found difficult to estimate the amount of fluorine in solution from the amount of F-containing mineral phases and slag compositions.