氧化铅脱除硫酸锌液中的氟

Fluoride Removal from Zinc Sulfate Solution with Lead Oxide

在模拟的合成硫酸锌溶液中,采用氧化铅作为除氟剂,研究了反应温度、溶液初始氟浓度、杂质镁离子及氯离子对除氟过程的影响。结果显示,反应温度及氯离子对除氟效率有较大影响,且初始氟浓度越高,氧化铅单位除氟量越高。当反应温度为80℃、锌浓度120 g/L、初始氟离子浓度250 mg/L时,溶液的除氟率最高,达到76%以上。采用企业的锌电解液对氧化铅除氟的适用性进行了验证,表明氧化铅也具有较好的除氟效果。在实际溶液的初始氟浓度为200 mg/L、锌浓度160 g/L时,120 min后,氟离子浓度降至95 mg/L,除氟率高于50%。在一段反应时间内,氟离子浓度随时间变化具有较好的线性关系。

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.