聚合硅酸硫酸铁铝混凝剂的制备表征与混凝性能  

Preparation and characterization of poly-aluminiumferric silicate sulfate coagulant and its coagulation property

作　　者：张开仕[1] 曾凤春[2] 谭超[1] 朱登磊[1] 

机构地区：[1]宜宾学院化学与化工学院,四川宜宾644000 [2]四川理工学院化学与制药工程学院,四川自贡643000

出　　处：《化工学报》2013年第8期3070-3075,共6页CIESC Journal

基　　金：四川省重点科技发展计划项目(2012JYZ008);四川省教育厅自然科学基金项目(2010ZA064)~~

摘　　要：引言聚合硅酸硫酸铁铝（PAFSS）是近十年来发展起来的一种新型无机高分子混凝剂,它不但综合了聚铝、聚铁和聚硅酸混凝剂的多重优点,还克服了聚铝处理后水样残余铝浓度高、聚铁残余色度大和聚硅酸稳定性差的缺点,在废水的处理过程中可同时发生电中和、吸附架桥和网捕等多种功能,产生比单一聚铁、聚铝和聚硅酸更好的混凝效果,因而得到了国内外研究人员的广泛关注。如文献[1-4]以硅酸钠、硫酸铝和硫酸铁为原料,通过硅酸钠的酸化得到聚硅酸（PSA）,A new type of inorganic polymer coagulant,poly-aluminum ferric silicate sulfate（PAFSS）,was prepared by alkali leaching,acidic leaching,oxidation,and polymerization.Fly ash,crap iron and waste sulfuric acid were utilized as raw materials.The structure,morphology and coagulation property of the sample were characterized by XRD,TEM,microelectrophoresis,ultrafiltration and coagulation experiments.The results showed that the multi-core PAFSS sample,which possessed larger amounts of Al—O—Si and Fe—O—Si,was synthesized from the interaction between Fe3＋,Al3＋,their hydrating polymers,SO2-4 and poly-silicic acid.The polymer displayed branch-like structure with higher polymerization degree,and larger molecular weight.The coagulation property of samples was excellent when the Si/（Fe＋Al）ratio was equal to 0.06—0.10.pH adaptability was much better than that of commercial polymerized ferric sulfate（PFS）,polymerized aluminum chloride（PAC）and poly-aluminum ferric sulfate（PAFS）.

关 键 词：粉煤灰 废硫酸 聚合硅酸硫酸铁铝 混凝性能 

分 类 号：X78[环境科学与工程—环境工程]