以赤泥为原料合成聚合氯化铝铁复合絮凝剂及其应用

介绍了用炼铝废弃物赤泥制备聚合氯化铝铁絮凝剂（PAFC）的基本工艺.研究了液固比、反应温度、反应时间对赤泥溶出率的影响,确定了最佳溶出条件为反应液固比3.5∶1、温度85℃、时间1.5 h;制备聚合氯化铝铁絮凝剂的最佳工艺条件为铝铁摩尔比1∶1,温度60℃,反应时间1.0 h.通过对该产品进行混凝试验,得出当PAFC投加量为0.80 mL.L-1,沉降时间为30 min,pH在6～7之间时,浊度、色度、COD的最大去除率分别达到69%、85%、70%.

Preparation and Application of Polymeric Aluminum Ferric Chloride with Red Mud

The research focused on a new technology of preparing a new complex wastewater coagulant,polymeric aluminum ferric chloride(PAFC),with red mud from aluminum-making factory.Extraction efficiency of iron and aluminum oxides from red mud was affected by the liquid-solid ratio,reaction temperature and immersed time,which were 3.5∶1,80 ℃,1.5 h,respectively.According to some experiments,the optimum conditions of synthesizing PAFC were summed up,the Al/Fe molar ratio,temperature,reaction time were 1∶1,60 ℃,1.0 h,respectively.Some flocculation experiments showed that the produced complex coagulant was proven to be effective in removing turbidity,chroma and COD in wastewater.Under the conditions of PAFC 0.80 mL·L-1,sedimentation time 30 min,pH 6~7,the high efficiency of removing turbidity,chroma,COD can reach to 69 %,85 %,70 %,respectively.