电炉粉尘预处理对其合成Ni-Zn铁氧体性能的影响

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

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。

Spinel ferrite such as MFe2 O4(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)Fe2 O4 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 NiCl2·6 H2 O is added to synthesize(NiZn)Fe2 O4 directly.The influence of pretreating EAFD with different contents of NaOH solution and the addition of NiCl2·6 H2 O with different contents on the magnetic property of obtained(Ni-Zn)Fe2 O4 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 0 mol/L to 10 mol/L.Meanwhile,the saturation magnetization of the prepared(Ni-Zn)Fe2 O4 increases from 19.5 A·m2/kg to 32.3 A·m2/kg.In addition,with the mass ratio of pretreatment furnace dust to NiCl2·6 H2 O decreased from 1∶0.7 to 1∶0.9,the saturation magnetic induction intensity of the synthesized sample increased from 28.4 A·m2/kg to 32.3 A·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.