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以活性炭为还原剂及以氩气为保护气,采用微波碳热还原的方法,将弱磁性的Fe2O3还原成强磁性的Fe3O4,并研究焙烧温度、保温时间以及SiO2粉末的加入对其还原焙烧成分及磁化效果的影响规律.结果表明:在配碳量一定的条件下,焙烧温度是微波碳热还原的关键因素,随着温度的升高,还原产物中Fe3O4的含量发生有规律的变化;650℃、保温5 min的条件下经微波还原后生成了纯Fe3O4粉末,其磁化率和还原度分别达到理论值2.33和11.11%;含SiO2的Fe2O3粉末在750℃以上进行微波还原,会生成大量的硅酸亚铁和氧化亚铁,导致Fe3O4含量降低,恶化还原焙烧指标,所以微波磁化焙烧的最佳温度应在570~650℃.
Using activated carbon as reductant and argon as shielding gas, the weak magnetic Fe2O3 was reduced to ferromagnetic Fe3O4 by microwave carbothermal reduction method. The effects of calcination temperature, holding time and addition of SiO2 powder on its reduction calcination composition And the magnetization effect.The results show that the calcination temperature is a key factor for the carbothermal reduction of the microwave under the condition of a certain amount of carbon content and the content of Fe3O4 in the reduced product changes regularly with the increase of the temperature. ℃, and kept for 5 min, the pure Fe3O4 powder was formed after microwave reduction. The magnetic susceptibility and the reduction ratio reached 2.33 and 11.11% respectively. When the SiO2-containing Fe2O3 powder was microwave-reduced above 750 ℃, a large amount of Ferrous silicate and ferrous oxide, resulting in reduced Fe3O4 content, reducing the reduction of roasting indicators, so the optimum microwave magnetization roasting temperature should be 570 ~ 650 ℃.