铁硅摩尔比对聚合硅酸铁的聚合机制及混凝效果的影响  

Effect of Fe/Si Molar Ratio on the Polymerization Mechanism and Coagulation Efficiency of Polymeric Ferric Silicate

作　　者：杨萍[1,2,3] 迟姚玲[1] 蒋进元[2,3] 李志丽[2,4] 丁福臣[1] 易玉峰[1] 

机构地区：[1]北京石油化工学院,北京102617 [2]中国环境科学研究院,北京100012 [3]环境基准与风险评估国家重点实验室,北京100012 [4]河北工程大学能源与环境工程学院,河北邯郸056038

出　　处：《当代化工》2016年第12期2717-2720,共4页Contemporary Chemical Industry

基　　金：国家水体污染控制与治理科技重大专项;项目号:2012ZX07201-005;辽河等流域水污染减排技术验证评估(ETV)与应用示范课题;项目号:2014ZX07504003-004

摘　　要：通过硅酸钠与硫酸亚铁聚合得到的无机高分子混凝剂聚合硅酸铁,用Fe-Ferron逐时络合比色法、Si-Mo逐时络合比色法测定了聚合硅酸铁中硅铁的形态,考察了熟化时间、Fe/Si摩尔比对硅铁的形态分布及转化规律的影响。结果表明:随着时间的延长Fea逐渐向Fec转化且过程比较缓慢,而硅的形态转化则呈现不同规律;Fe/Si摩尔比不同硅铁间成键方式亦有区别。絮凝实验表明适宜的硅铁比及投加量是协同电中和、吸附架桥以及絮凝卷扫的关系发挥混凝效能的关键。Inorganic polymer coagulant polymeric ferric silicate was obtained by polymerization of sodium silicate and ferrous sulfate, the species distribution and transformation of iron and silicon in polymeric ferric silicate were studied by means of Fe-Ferron and Si-Mo complexion timed spectrophotometry. The influence of the aging time, Fe/Si molar ratio was investigated. The experimental results show that： with the increasing of aging time, the species of iron in polymeric ferric silicate changes from lower polymer to higher polymer and the process is relatively slow. The morphological transformation of silicon shows different rules; when the molar ratio of Fe/Si is different, ferrosilicon bonding mode is different. Flocculation experiments show that suitable Fe/Si molar ratio and dosage are the key of playing flocculability efficiency by coordination of collaborative charge neutralization, bridging adsorption and flocculation volume sweep relations.

关 键 词：聚合硅酸铁 硅铁形态 Fe/Si摩尔比 混凝 

分 类 号：X522[环境科学与工程—环境工程]