聚合硅酸硫酸铁铝混凝剂的制备研究  

Study on preparation of poly aluminium ferric silica sulfate coagulant

作　　者：曾凤春[1] 

机构地区：[1]四川理工学院化学与制药工程学院,自贡643000

出　　处：《四川大学学报（自然科学版）》2010年第6期1381-1387,共7页Journal of Sichuan University(Natural Science Edition)

摘　　要：以粉煤灰、废硫酸、废铁屑等工业废弃物为原料,通过酸溶、碱溶、氧化和聚合过程,制备出了新型无机高分子混凝剂—聚合硅酸硫酸铁铝(PAFSS),用XRD进行表征,并研究了浸取阶段(碱溶和酸溶)对粉煤灰中硅、铁、铝溶出率的影响因素和制备阶段对PAFSS混凝性能的影响因素,测试了PAFSS的混凝性能和最优形态分布.实验结果表明,当浸取阶段温度90℃、液固比(体积比)3.0、时间3h、浸取液浓度5mol·L^(-1)和制备阶段硅酸聚合pH2.0、硫酸总量与硫酸亚铁摩尔比0.37、Si/Fe+Al摩尔比0.10时,所制PAFSS为Al^(3+)、Fe^(3+)、SO_4^(2-)和聚硅酸相互作用形成的无定形高聚物,其最优形态Fe_b和Al_b含量高,pH值适用范围宽,混凝性能明显优于市售聚合硫酸铁(PFS)、聚合氯化铝(PAC)和聚合硫酸铁铝(PFAS)混凝剂.Using fly ash, crap iron and waste sulfuric acid as raw materials, poly aluminium ferric silica sulfate（PAFSS）, which is a new type of inorganic polymer coagulant, was prepared by acid dissolution, alkali dissolution, oxidation and polymerization. The structure of PAFSS was characterized by XRD. The factors, which influenced the dissolution rate of Fe, AI and Si in fly ash and coagulation properties of PAFSS, were investigated. The species distributions and coagulation properties of PAFSS were studied. The results showed that the prepared PAFSS is an amorphous polymer, which was synthesized by the co-polymerizations of Al3＋ , Fe3＋ , SO24- and poly silicic acid under the optimal conditions, and the best species content of Feb and Alb in PAFSS was obviously higher, the coagulation properties and the pH adaptability of PAFSS were significantly better than those of commercial polymerized ferric sulfate （PFS）, polymerized aluminum chloride（PAC） and poly-ferric aluminum sulfate（PFAS）. The optimal conditions were found as follows, reaction temperature is 90℃, reaction time is 3 h, liquid solid ratio is 3.0, immersion concentration is 5 mol ·L-1 , poly silicic acid pH is 2 in the immersing stage, the molar ratio of H2SO4/FeSO4 is 0.37, the molar ratio of Si / Fe＋Al is 0.10.

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]