【摘要】 研究了冶炼烟气制酸过程产生的洗涤污酸浓缩除氟的效果和回用到湿法炼锌系统的可行性,通过模拟污酸和工业污酸浓缩试验,分析了污酸脱氟效果。浓缩过程中,当污酸中硫酸浓度低于40%时,气相中的氟浓度低于液相,污酸中的氟浓度增加;当污酸中硫酸浓度高于40%时,污酸中氟的挥发性增加,氟浓度开始逐渐降低;当污酸中硫酸浓度大于45.59%,污酸中氟的浓度急剧降低,污酸浓度超过81.67%时,污酸中氟的脱除率高于99.17%,氟含量降低到237.45mg/L。更多还原

【Abstract】 Effect of defluorination from waste acid during acid-making of metallurgical off-gas by concentration method and feasibility of recycling of waste acid for zinc hydrometallurgy were studied.Defluorination affect was analyzed by comparing experiment of simulated waste acid and industrial waste acid.Fluoride concentration in gas phase is lower than that in liquid phase when concentration of sulfuric acid in waste acid is 40% below,which shows increase of fluoride concentration in waste acid.When concentration of sulfuric acid in waste acid is 40% above,volatility of fluoride in waste acid rises,and fluoride concentration drops.Fluoride concentration in waste acid drops drastically when concentration of sulfuric acid in waste acid is higher than 45.59%.Removal rate of fluoride in waste water is 99.17%above with fluorine content of 237.45 mg/L when concentration of sulfuric acid in waste acid is higher than81.67%.更多还原