利用含锌粉尘和铁鳞中锌和铁制备合成Ni-Zn铁氧体

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

以电炉粉尘(EAFD)中提取的Zn^(2+)、铁鳞中提取的Fe^(3+)和六水合氯化镍(NiCl_(2)·6H_(2)O)为原料,采用水热法直接制备合成尖晶石型Ni-ZnFe_(2)O_(4)。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Zn^(2+)提取率以及HCl浓度对铁鳞中Fe^(3+)浸出率的影响,然后分析了Ni-ZnFe_(2)O_(4)合成条件对其磁性能的影响。结果表明,当NaOH与EAFD质量比为1∶1,焙烧温度为450℃,焙烧时间为1 h时,电炉粉尘中锌的提取率为88.77%;当HCl浓度为1.75 mol/L时,铁鳞中Fe^(3+)浸出率为96.89%。当EAFD中提取的Zn^(2+)、铁鳞中提取的Fe^(3+)和NiCl_(2)·6H_(2)O的摩尔比控制为1∶20∶9时,可以成功制备尖晶石型Ni-ZnFe_(2)O_(4),并且对合成的Ni-ZnFe_(2)O_(4)进行热处理之后可以显著提高其磁性能,当热处理温度从150℃提高到450℃时,尖晶石型Ni-ZnFe_(2)O_(4)的饱和磁感应强度从13.35 (A·m^(2))/kg增长到40.06 (A·m^(2))/kg。

Spinel Ni-ZnFe_(2)O_(4) was synthesized directly by hydrothermal method using Zn^(2+) extracted from EAFD, Fe^(3+) extracted from iron scale and nickel chloride hexahydrate(NiCl_(2)·6 H_(2)O) as raw materials. The effects of roasting temperature, NaOH/EAFD mass ratio and roasting time on the extraction rate of Zn^(2+) from EAF dust and the concentration of HCl on the leaching rate of Fe^(3+) from iron scales were discussed, respectively. Then, the influences of synthesis conditions on the magnetic properties of prepared Ni-ZnFe_(2)O_(4) 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 1 h. When the concentration of HCl was 1.75 mol/L, the dissolution rate of Fe^(3+) from iron scales is 96.89%. Meanwhile, spinel Ni-ZnFe_(2)O_(4) could be synthesized successfully when the mole ratio of Zn^(2+) extracted from EAFD and Fe^(3+) extracted from iron scale to NiCl_(2)·6 H_(2)O is controlled at 1∶20∶9. Moreover, the magnetic properties of synthesized Ni-ZnFe_(2)O_(4) 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-ZnFe_(2)O_(4) increases from 13.35(A·m^(2))/kg to 40.06(A·m^(2))/kg.