METHODS AND SYSTEMS FOR AUTOMATIC SEPARATION OF FLUORINE AND CHLORINE

Abstract

The invention relates to a method for the self-separation of fluorine and chlorine, comprising the following steps: 1) obtaining a saturated chlorine solution: adding chlorine to fluorine-chlorine wastewater to increase the concentration of chloride ions in the fluorine-chlorine wastewater until the chloride ions are supersaturated, and crystallizing and precipitating all fluoride ions and some chloride ions in the wastewater to obtain fluorine-chlorine mixed crystals, the liquid phase being a saturated chlorine solution; 2) obtaining chloride crystals: crystallizing the saturated chlorine solution obtained in step 1) to obtain chloride crystals; and 3) obtaining fluoride crystals by separation: dissolving the fluorine-chlorine mixed crystals obtained in step 1) to obtain a fluorine-chlorine mixed solution, and with repeated dissolution and addition of ilonia, obtaining ilonia crystals by separation. The invention also relates to a system for the self-separation of fluorine and chlorine.Methods and systems for separating fluorine and chlorine can reduce the use of auxiliary additives and effectively and accurately separate the elemental fluorine from the elemental chlorine, thereby improving the treatment quality and purity of fluorine-chlorine wastewater.