Preparation of Nanosized Magnetism Fe3O4 Powders by Reduction Co-precipitation Method
The soluble metallic ions were extracted from tin polymetallic sulfide orebody in wet chemical method. Hydrogen peroxide was poured into the leach liquor to oxidize Fe2+ to Fe3+. Addition of stronger ammonia water was needed to adjust pH to make the complete precipitation of Fe3+. The as-obtained deposition of iron trihydroxide was dissolved in enough acid. NaHSO3·7H2O were used as reducing agent to adjust the molar ratio of Fe2+ and Fe3+. NaOH solution and C12H25OSO3Na were chosen as precipitating agent and surface active agent, respectively. Nanosized Fe3O4 particles were obtained by reduction co-precipitation of Fe2+ and Fe3+. The properties of samples were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), vibrating sample magnetometer (VSM) and specific area test. The XRD results indicated that pure phase Fe3O4 was formed. The TEM results exhibited that Fe3O4 particles were spheric shape and its average grain size was about 21nm. The IR spectrum showed that the particles were coated effectively by surface active agent. The magnetic hysteresis loop implied that samples had superparamagnetism and their saturation magnetization reached 37.34 A·m2kg.
Nanosized Fe3O4 powders iron separation reduction co-precipitation
王缓 徐利华 邸云萍 张菡
北京科技大学材料学院无机非金属系 100083
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）