Abstract:In synthetic zinc sulfate solution, applying lead oxide as agent of fluoride removal, effects of reaction temperature, initial fluoride concentration, ions of magnesium and chlorine on defluorination process were studied. The results show that temperature and chlorine ion have a great influence on efficiency of fluoride removal. The higher the initial fluorine concentration is, the higher the amount of fluorine removed by the unit weight of lead oxide is. When temperature is 80 ℃, zinc concentration is 120 g/L, and initial fluoride concentration is 250 mg/L, the highest fluorine removal rate of the solution is 76% above. The applicability of lead oxide used for fluoride removal was verified by zinc electrolyte of the enterprise, and the results indicate that lead oxide also has a good effect on fluoride removal. When initial fluoride concentration is 200 mg/L and zinc concentration is 160 g/L, the fluorine ion concentration drops to 95 mg/L after 120 min, and fluoride removal rate is 50% above. The fluorine ion concentration has a good linear relationship varied with time during a period of reaction time.