CHEN Chang1, 2, 3, LI Yang1, 2, 3, GAN Wenliang1, FENG Hao1,HE Huanyu1, 2, 3,NI Hongwei1, 2, 3
Abstract: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 NiZnFe2O4 increases from 13.35(A·m2)/kg to 40.06(A·m2)/kg.