METHOD FOR RECOVERING LARGE-PARTICLE CALCIUM FLUORIDE FROM FLUORINE-CONTAINING WASTEWATER

A method for recovering large-particle calcium fluoride from fluorine-containing wastewater. The method comprises: subjecting fluorine-containing acidic wastewater to an impurity removal treatment to obtain pure fluorine-containing wastewater; activating a seed crystal containing calcium fluoride to obtain an activated seed crystal; adding the activated seed crystal to the pure fluorine-containing wastewater, adding a calcium-containing regulator according to a preset calcium-fluorine ratio, and then adding a crystal growth promoter according to a preset mass ratio to obtain a reaction solution; and adjusting the pH of the reaction solution at a preset reaction temperature, stirring the reaction solution, and subjecting same to sedimentation, filtration and drying to obtain large-particle calcium fluoride, wherein the adding amount of the activated seed crystal is 5-10 times the concentration of fluorine ions in the pure fluorine-containing wastewater. L'invention concerne une méthode de récupération de fluor