磁性膨润土的制备及其性能研究  

Study on and Preparation and Properties of Magnetic Bentonite

作　　者：赵晓东[1] 冯启明[1] 王维清[1] 

机构地区：[1]西南科技大学固体废弃物处理与资源化省部共建教育部重点实验室,四川绵阳621010

出　　处：《非金属矿》2010年第2期15-17,20,共4页Non-Metallic Mines

基　　金：国家自然科学基金资助项目(项目编号:50804039)

摘　　要：采用共沉淀法制备Fe3O4磁流体,用硅烷偶联剂改性膨润土,用磁流体与膨润土以及改性膨润土复合制备一系列不同Fe3O4载量的磁性膨润土,并对其进行了X射线衍射、透射电子显微镜、扫描电子显微镜、X射线能谱仪、振动样品磁强计等表征分析,测定了样品的磁分离回收率及对Cu2+、Zn2+、Cd2+的交换吸附量。结果表明,Fe3O4微粒赋存于膨润土表面而形成磁性集合体,改性磁性膨润土具有良好的超顺磁性,对Cu2+、Zn2+、Cd2+的交换吸附性能与其所含膨润土相当,但随Fe3O4载量增加而降低。Fe3O4载量为25%时,其饱和磁化强度、剩余磁化强度分别为13.344A.m2/kg和0.365 A.m2/kg,改性前膨润土与改性后磁性膨润土磁分离回收率分别为50.3%和90.1%。The magnetic influence of Fe3O4 was prepared by coprecipitation method, the bentonite was modified with silane coupling agent, and the magnetic bentonite and magnetic modified bentonite were prepared with different loadings of Fe3O4, then the products were characterized by X-ray diffraction, scanning electronic microscopy, transmission electron microscopy, energy dispersive spectrometer and vibration sample magnetometer. The magnetic recovery rate and saturation exchange-adsorption capacity to Cu^2＋, Zn^2＋, Cd^2＋ of the products were also measured. The results show that Fe3O4 particles occur on the surface of bentonite particles and form magnetic aggregation. The magnetic modified bentonite shows well characteristic of superpara magnetism, and its exchange-adsorption capacity to Cu^2＋, Zn^2＋ and Cd^2＋ is approximate with bentonite, but decreases slightly along with the loadings of Fe304 increasing. When the loadings of Fe3O4 are 25%, the saturation magnetic induction and remanence magnetization of magnetic bentonite are 13.344 and 0.365 A·m^2/kg respectively, the magnetic recovery rate of bentonite and modified bontonite are 50.3% and 90.1% respectively.

关 键 词：磁性膨润土 磁性能 磁分离回收率 交换吸附量 

分 类 号：TD985[矿业工程—选矿] O482.54[一般工业技术—材料科学与工程]