硫铁矿烧渣水热-热解法制备纳米Fe_3O_4

Preparation of nano-Fe_3O_4 from pyrite cinders by hydrothermal-thermolysis method

利用硫铁矿烧渣制取纳米Fe3O4可使废渣变废为宝,消除环境污染。采用不同方法处理硫铁矿烧渣,以获取的浸取液为原料,采用三乙醇胺水热-热解法制备纳米四氧化三铁(Fe3O4)。考察了不同浸取液、浸取液浓度、三乙醇胺体积分数、反应温度和反应时间对产物物相和形貌的影响。用X射线衍射仪、透射电镜、激光粒度仪及Zeta电位仪对产物进行了表征。结果表明,浸取液中Fe2(SO4)3浓度为0.08 mol/L、三乙醇胺体积分数为42.8%时,在200℃下反应2 h制备的Fe3O4呈球形,粒度为20～60 nm。研究结果为综合利用了硫铁矿烧渣提供了一种新的途径。

The preparation of nano-Fe3O4using pyrite cinder can turn waste into wealth,and eliminate environmental pollution at the same time.Nano-Fe3O4 was prepared by the hydrothermal-thermolysis method in the presence of triethanolamine using the leachate from leaching pyrite cinders with different acids.The effects of leaching concentration of acids,concentrations of the leachate and triethanolamine,reaction temperature and time were discussed.The structure and morphology of the prepared nano-Fe3O4were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,laser particle size and Zeta potential analyzer.The results showed that nano-spherical Fe3O4 with particle size of 20—60 nm could be prepared by reaction for 2h at 200℃ with Fe2（SO4）3 concentration of the leachate 0.08 mol/L and concentration of triethanolamine 42.8%（V/V）.The experiment provided a method for comprehensive utilization of pyrite cinder.