Abstract:

Aluminum foil pickling waste as raw material is used to prepare polyaluminum ferric sulfate(PAFS) by acid dissolution-alkalization -hydrolysis ripening process. The structure of the product is characterized by XRD and SEM, and the wastewater purification experiment is carried out. The results show that the prepared PAFS product is an amorphous and polycrystalline mineral mixture, when the concentration of acid is 9 mol/L, the ratio of n(Fe³⁺) and n(Al³⁺) is 4:1, the reaction temperature is 110℃, the reaction time is 4.5 hours, the alkalinity is 0.6, hydrolysis temperature is 70℃, hydrolysis time is 4 h, curing temperature is 50℃, and curing time 8 h. The results of wastewater purification show that the removal rate of the turbidity is equivalent to that by the existing purifier of polyferric sulfate (PFS), and the COD removal rate and settling time are better than those by the PAC and PFS.

Key words: waste acid, polymeric aluminum ferric sulfate, purifier, turbidity removal

摘要：

以铝箔酸洗废液为原料，通过酸溶-碱化-水解熟化工序制备聚合硫酸铁铝（PAFS）。用XRD、SEM对产品结构进行表征，并进行净水实验。实验结果表明，在酸浓度为9 mol/L、n（Fe³⁺）：n（Al³⁺）为4：1、反应温度为110℃、反应时间为4.5 h、碱化度0.6、水解温度为70℃、水解时间4 h、熟化温度为50℃、熟化时间8 h的条件下，制备的聚合硫酸铁铝液体产品呈无定型、多晶体矿混合聚合物结构。污水净化结果表明，除浊率与现有聚合硫酸铁（PFS）的效果相当，COD去除率及沉降时间优于现有聚合氯化铝及PFS。

关键词: 废酸, 聚合硫酸铁铝, 净水剂, 除浊

CLC Number: 

• X703