尾矿中铁分离工艺及纳米Fe_3O_4磁性颗粒的制备

Separation Process of Iron from Tailings and Preparation of Nanosized Magnetic Fe_3O_4 Powder

通过酸性浸出的方法从尾矿中分离出高纯度铁,并以此为原料采用还原—化学共沉淀法制备了Fe_3O_4纳米颗粒。经过TEM等手段的表征,结果表明颗粒平均粒径为10 nm左右,且粒径分布均匀。实验研究了从尾矿中获得高纯度铁的工艺条件,并分析了工艺因素的影响机制。用振动样品磁强计室温下测量粉末样品的磁性能,磁滞回线表明所制备的样品具有超顺磁性。

Iron is separated from tailings by acidic leaching method, and nanosized magnetic Fe3O4 powder is prepared using a reduction-coprecipitation method. TEM image shows that average particles size of the Fe3O4 is about 10nm and exhibit a uniformly distribution. The process conditions in which high-purity iron can be obtained is studied, and the affecting mechanism of these factors is analyzed. Magnetic properties of the sample are measured by vibrating sample magnetometer. The magnetic hysteresis loop shows that the sample has superparamagetism