电炉粉尘预处理对其合成Ni-Zn铁氧体性能的影响

摘要：尖晶石型铁氧体MFe2O4（M=Ni、Zn、Mn和Mg等）由于其良好的稳定性和优越的磁电性能，在磁电领域受到广泛应用。以电炉粉尘为原料，先利用NaOH溶液对电炉粉尘进行预处理，然后加入不同含量的NiCl2·6H2O，通过水热方法直接合成具有尖晶石结构的Ni-Zn铁氧体（(Ni,Zn)Fe2O4），最后详细探讨了不同浓度的NaOH预处理除硅和配入不同量NiCl2·6H2O对合成(Ni,Zn)Fe2O4磁性能的变化规律。结果表明，当NaOH浓度从0增加到10mol/L时，预处理后电炉粉尘中SiO2质量分数从6.85%降低到1.49%，合成的Ni-Zn铁氧体的饱和磁感应强度从19.5A·m2/kg升高到32.3A·m2/kg；而预处理后电炉粉尘与NiCl2·6H2O的质量比从1∶0.7降低到1∶0.9时，所得样品的饱和磁感应强度从28.4A·m2/kg增长到32.3A·m2/kg。该工艺不仅简化了电炉粉尘的处理工艺流程，而且实现了其高附加值利用。

Effect of pretreatment on magnetic property of synthesized Ni-Zn ferrite from electric arc furnace dust

Spinel ferrite such as MFe2O4 (M：Ni, Zn, Mn and Mg etc.) has great application in the fields of magnetic and electric due to its good stability and excellent magnetic/electric properties. (Ni,Zn)Fe2O4 spinel ferrite was synthesized by hydrothermal method using electric furnace arc dust (EAFD) as raw material. Firstly, NaOH solution is used to treat EAFD to remove Si. Then, different contents of NiCl2·6H2O is added to synthesize (Ni,Zn)Fe2O4 directly. The influence of pretreating EAFD with different contents of NaOH solution and the addition of NiCl2·6H2O with different contents on the magnetic property of obtained (Ni,Zn)Fe2O4 are investigated systematically. It is indicated that the mass fraction of SiO2 in EAFD decreases from 685 mass% to 1.49 mass% when the concentration of NaOH increases from 0mol/L to 10mol/L. Meanwhile, the saturation magnetization of the prepared (Ni-Zn)Fe2O4 increases from 19.5A·m2/kg to 32.3A·m2/kg. In addition, with the mass ratio of pretreatment furnace dust to NiCl2·6H2O decreased from 1∶0.7 to 1∶0.9, the saturation magnetic induction intensity of the synthesized sample increased from 28.4A·m2/kg to 32.3A·m2/kg. It is not only simplified the process of recovery valuable elements in EAFD, but also convert metallurgical solid waste into high value added materials directly.