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浙江大学学报(工学版)
J4  2009, Vol. 43 Issue (09): 1714-1718    DOI: 10.3785/j.issn.1008-973X.
    
Synthesis of ferrite from marine manganese nodules
HAN Chen-hua1,ZHANG Ping-ping1, CHENG Ji-peng 2,YE Ying1
（1. Department of Earth Science, Zhejiang University, Hangzhou 310027, China; 2. Department of Materials
Science and Engineering, Zhejiang University, Hangzhou 310027, China）
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Abstract  

The pre-processed deep sea manganese nodules were calcined at 1 000 ℃ for 5 h with various mass fraction of NaOH as flux-assistant, such as 0, 10%, 15% and 20%. Then a kind of soft-magnet was synthesized. The fineness and magnetic performance of the product enhances with increasing the mass fraction of NaOH whereas it apparently weakens in the case that the mass fraction of NaOH is over 15%. X-ray diffraction （XRD） and scanning electron microscope (SEM) show that the major phase in the products is manganese ferrite with spinel-type structure. Flux-assistant can restrain the formation of manganosite and increase the amount of ferrite. Energy dispersive X-ray spectroscopy (EDS) reveals that the products are abundant in elements of Mn and Fe and the ration between Mn and Fe is near 3∶1. Magnetic hysteresis and magnetic susceptibility results display that the synthesized manganese ferrite has excellent magnetic susceptibility performance and reaches easily saturation magnetization state.

CLC:  TQ 013.1  
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Cite this article:

HAN Chen-Hua, ZHANG Beng-Ping, CHENG Ji-Feng, et al. Synthesis of ferrite from marine manganese nodules. J4, 2009, 43(09): 1714-1718.

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http://www.zjujournals.com/eng/ 10.3785/j.issn.1008-973X.     OR     http://www.zjujournals.com/eng/Y2009/V43/I09/1714


用大洋锰结核直接制备铁氧体的研究

大洋锰结核进行预处理后,分别与质量分数为0、10%、15%及20%的NaOH助熔剂混合,在1 000 ℃下煅烧5 h,合成软磁铁氧体材料.产物的磁化率随助熔剂的质量分数的增加而升高,当助熔剂的质量分数超过15% 时样品的磁化率明显降低. X射线衍射(XRD)和扫描电镜(SEM)表明,锻烧所得的软磁性材料为具有尖晶石结构的铁酸锰,助熔剂可以抑制方锰矿的形成,提高铁酸锰的产率.能量分散谱仪（EDS）显示产物中有大量的锰、铁元素,其比值接近于3∶1.磁滞回线和磁化率分析数据说明,合成的铁酸锰具有良好的磁化率和易饱和磁化性.

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