以硝酸钴和硝酸铁为主要原料,采用化学共沉淀法制备CoFe2O4纳米磁性微粒,然后将其与膨胀石墨复合制得CoFe2O4载量不同的磁性膨胀石墨.用X射线衍射(XRD)、透射电镜(TEM)、震动样品磁强计(VSM)、扫描电镜(SEM)对CoFe2O4纳米磁性微粒和磁性膨胀石墨进行了表征.并研究了CoFe2O4载量不同的磁性膨胀石墨对不同油类的饱和吸油量、对水和油的竞争吸附比、不同吸附时间和环境温度对饱和吸油量的影响、磁分离回收及离心法再生吸附后的磁性膨胀石墨.结果表明,合成的CoFe2O4结晶度高,晶粒度约为13nm.CoFe2O4载量越低、油品粘度越高,磁性膨胀石墨的饱和吸油量越大；油品粘度越大,油、水竞争吸附时水含量越低；磁性膨胀石墨10s即可达到饱和吸油量的80％,90s后达到饱和吸附；CoFe2O4载量为35％时,磁回收率为99.2％,且再生离心转速为3000r/min时再生吸油量达到较大值.
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