源于镀铝锌渣的复合铝锌铁混凝剂的制备及混凝特征  

Preparation and coagulation behavior of poly-Al-Zn-Fe coagulant from galvanized-aluminum-slag

作　　者：付英 张继超[1] 王衍争[1] 苏漫漫 蔡珊珊[1] 于衍真[1] 谭娟[1] 

机构地区：[1]济南大学土木建筑学院,山东济南250022

出　　处：《中国石油大学学报（自然科学版）》2014年第1期161-166,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：山东省优秀中青年科学家奖励基金项目(SBS1112);山东省教育厅高等学校优秀骨干教师国际合作培养项目(2009);国家自然科学基金项目(51178207)

摘　　要：以镀铝锌渣(GAS)为原料,采用"混合酸浸及加碱聚合"两段法合成复合铝锌铁(PAZF)混凝剂,同时采用紫外可见分光光度计(UV)及扫描电镜(SEM)研究其制备过程的微观表现,然后与聚合氯化铝(PAC)对比研究其对染料废水的混凝特征。结果表明:酸浸及聚合的较佳时间分别为3和5 h;酸浸取物主要为锌、铝、铁的盐类及3种金属的硫酸氯化盐类;聚合形成了与金属盐类完全不同、具有不同吸收波长、种类较多的聚合类物质,且其结构随聚合时间的延长不断调整;随SEM放大倍数的增加,PAZF表面形貌发生很大变化,PAC基本无变化;放大4000倍时PAZF表现为一种表面积较大、较为匀称的褶皱式微观结构,放大8 000倍时呈现为较为匀称的网状菜花头式微观结构;PAZF应对水质变化的投药量范围宽于PAC,且去除浊度及有机物的最佳pH范围比较吻合,而PAC去除两者的最佳pH范围不同;PAZF具有的混凝特征取决于其独特的微观表现。Poly-Al-Zn-Fe （PAZF） coagulant was prepared by a two-stage method of leaching with mixed acid and polymeri-zing with alkali using galvanized-aluminum-slag （GAS）. Its micro-properties during preparation were conducted using UV-visspectrophotometer （UV） and scanning electron microscopy （SEM）. Coagulation behavior of PAZF was tested by Jar tests intreating a simulated dyeing wastewater compared with that of poly-aluminum-chloride （PAC）. The results show that the opti-mal leaching time and polymerizing time are 3 and 5 hours, respectively. The acid leaching substances mainly contain zinc,aluminum and iron salts and polymers of these three metals of chloride-sulfate. Many types of polymeric substances with dif-ferent absorption wavelengths were formed while their copolymer structures with characteristic absorption-peak of aluminum,zinc and iron were adjusted continuously with the increase of polymerizing time. The surface morphology of PAZF changed alot at different magnification times, while PAC changed a little. PAZF appeared to have a kind of uniform pleated structurehaving larger surface area at 4 000 magnification times. However, it has a series of cauliflower head structure with some plea-ted ditch having different width and depth at magnification of 8 000 times. PAZF dosage range showing excellent coagulationefficiency in treating complicated qualities of water samples was wider than PAC. It had a consistent optimal pH range for re-moval of turbidity and organic matters compared with PAC showing different pH ranges. The distinctive coagulation behaviorof PAZF was determined by its special micro-properties.

关 键 词：镀铝锌渣 复合铝锌铁 微观表现 混凝特征 

分 类 号：TQ153.19[化学工程—电化学工业]