Dissolution mechanism of fluorine in aqueous solution from fluorine containing synthetic slag

The behavior of dissolution of fluorine from the fluorine containing synthetic slag was clarified by the shaking test under various experimental conditions. The fluorine containing minerals were cuspidine, fluorapatite and fluorite. The amount of fluorine dissolved from the slag increased with an increasing of the concentration of fluorine in the slag and an decreasing of the size of slag particles. The amount of fluorine dissolved from the slag could be estimated from the size distribution of slag particle and the concentration of slag for the shaking test. The amount of fluorine dissolved from the slag decreased with an increasing of the basicity of slag and the concentration of alumina. The amount of fluorine from the slag increased with increasing the cooling rate during solidification because the slag became amorphous. The dissolution of fluorine from the slag was controlled by the mass transfer in the liquid layer which was formed near the surface of slag.