利用含锌粉尘和铁鳞中锌和铁制备合成Ni-Zn铁氧体

以电炉粉尘(EAFD)中提取的Zn2+、铁鳞中提取的Fe3+和六水合氯化镍(NiCl2·6 H2 O)为原料,采用水热法直接制备合成尖晶石型Ni-ZnFe2 O4.首先探讨了焙烧温度、NaOH与EAFD质量比和焙烧时间对电炉粉尘中Zn2+提取率以及HCl浓度对铁鳞中Fe3+浸出率的影响,然后分析了Ni-ZnFe2 O4...

Synthesis of Ni-Zn ferrite from zinc in Zn-contain dust and iron in scale

Spinel Ni-ZnFe2O4 was synthesized directly by hydrothermal method using Zn2+ extracted from EAFD, Fe3+ extracted from iron scale and nickel chloride hexahydrate (NiCl2·6H2O ) as raw materials. The effects of roasting temperature, NaOH/EAFD mass ratio and roasting time on the extraction rate of Zn2+ from EAF dust and the concentration of HCl on the leaching rate of Fe3+ from iron scales were discussed, respectively. Then, the influences of synthesis conditions on the magnetic properties of prepared Ni-ZnFe2O4 were investigated. The results show that the extraction rate of zinc from EADF is 88.77% when the mass ratio of NaOH to electric furnace dust is 1∶1, the roasting temperature is 450℃, and the roasting time is 1h. When the concentration of HCl was 1.75mol/L, the dissolution rate of Fe3+ from iron scales is 96.89%. Meanwhile, spinel Ni-ZnFe2O4 could be synthesized successfully when the mole ratio of Zn2+ extracted from EAFD and Fe3+ extracted from iron scale to NiCl2·6H2O is controlled at 1∶20∶9. Moreover, the magnetic properties of synthesized Ni-ZnFe2O4 could be improved significantly after heat treatment. When the heat treatment temperature is increased from 150℃ to 450℃, the saturated magnetic induction intensity of prepared spinel Ni ZnFe2O4 increases from 13.35（A·m2）/kg to 40.06（A·m2）/kg.