粉煤灰制备混凝剂及其砸黄河水的处理效果

以粉煤灰和铁泥为原料、加入一定量NaCl作助溶剂室温下制备粉煤灰混凝剂，考察酸灰比与酸浓度对Fe3＋、Al“溶出率及混凝剂对黄河水处理效果的影响。结果表明，Fe3＋、A13＋的最佳溶出条件为酸灰比3mL／g、HCl浓度4mol／L，此时Fe“溶出率为28．1％，浓度为11．81g／L；A13＋溶出率为5．2％，浓度为1．86g／L。粉煤灰混凝剂对黄河水的处理效果在投加量2．38mL／L、沉降时间30min、pH6．2～7．5时最佳，对浊度、ss和COD。。平均去除率分别为89．7％、83．6％和62．3％，优于传统市售混凝剂PAC和Fc，Fe3＋、AI3＋同时存在有利于各自优势的发挥从而提高混凝效果。

Preparation of coagulant from fly ash and its application in Yellow River water treatment

Coagulant was prepared with fly ash and iron mud, adding a certain amount of NaC1 as cosolvent at room temperature. Effect of ratio of HC1 to fly ash and HC1 concentration on Fe3 ＋ and A13 ＋ dissolution rate and coagulation performance on Yellow River water were investigated. The result showed that the optimal dissolution conditions of Fe3. and A13 ＋ were HC1 to fly ash ratio of 3 mL/g and HC1 concentration of 4 mol/L. At the same time, Fe3 ＋ concentration was 11.81 g/L with dissolution rate of 28.1%. A]3 ＋ concentration was 1.86 g/L with dissolution rate of 5.2%. Furthermore, the optimal coagulation effect to Yellow River water was attained at dosage of 2.38 mL/L, sedimentation time of 30 min, pH 6.2 - 7.5, and the removal efficiency of turbidity, SS and CODMn could reach about 89.7% , 83.6% and 62.3% , respectively, so the water treatment effect of coagulant here is better than that of PAC and FC from market. AS co-exist of Fe3＋ and A13＋ can better play their respective advantages, the coagulation effect can be enhanced.