铁精粉制备α-Fe_(2)O_(3)纳米粒子及其机理  

Preparation and Mechanism ofα-Fe_(2)O_(3) Nanoparticles by Using Iron Concentrate Powder

作　　者：李婷 裴文利 陈婉晴[3] 佟冰 LI Ting;PEI Wen-li;CHEN Wan-qing;TONG Bing(School of Material Science&Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory for Anisotropy and Texture of Materials Ministry of Education,Northeastern University,Shenyang 110819,China;Fushun Hanking Aoniu Mining Co.,Ltd.,Fushun 113125,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819 [3]抚顺罕王傲牛矿业股份有限公司,辽宁抚顺113125

出　　处：《东北大学学报（自然科学版）》2023年第2期206-214,共9页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(52071070,51871045);中央高校基本科研业务费专项资金资助项目(N2017003,N2102004).

摘　　要：采用商业磁铁矿铁精粉(Fe_(3)O_(4)),设计了提纯和制备工艺,成功制备出质量分数为99.5%以上、分散性良好的α-Fe_(2)O_(3)纳米粒子,对其提纯、制备工艺及机理进行了深入研究.结果表明:w NaOH对除硅效果影响显著,当w NaOH为39%时,可使原料矿粉中w SiO 2由1.11%降至0.032%,得到较纯铁精粉;随烧结温度的升高,α-Fe_(2)O_(3)颗粒的结晶度、形貌特征及磁性能随之发生变化;当烧结温度为670℃时,α-Fe_(2)O_(3)颗粒综合性能最佳,颗粒结晶度较高、分散性较好,具有亚铁磁性;通过对氢氧化铁沉淀物加热搅拌时间的控制,可有效调控α-Fe_(2)O_(3)的晶粒尺寸;当搅拌时间为60 min时,获得分散性好、平均粒径仅为35.3 nm的α-Fe_(2)O_(3)纳米粒子.Using commercial magnetite iron powder(Fe_(3)O_(4)),a purification and preparation process was designed,andα-Fe_(2)O_(3) nanoparticles with a mass fraction of more than 99.5%and good dispersibility were successfully prepared.The purification,preparation process and mechanism were studied in detail.The results show that:w NaOH has a significant impact on the effect of silicon removal,when w NaOH is 39%,the w SiO 2 in the raw ore powder can be reduced from 1.11%to 0.032%to get more pure iron fine powder.With the increase of the sintering temperature,the crystallization,appearance characteristics and magnetic properties ofα-Fe_(2)O_(3) particles have changed.When the sintering temperature is 670℃,the comprehensive performance ofα-Fe_(2)O_(3) particles is the best,including higher particle crystallinity,good dispersibility and ferrimagnetic properties.By controlling the heating and stirring time of the hydroxide sediment,the grain size of theα-Fe_(2)O_(3) can be effectively regulated.When the stirring time is 60 min,theα-Fe_(2)O_(3) with a high-quality dispersability and a average particle size of only 35.3 nm is obtained.

关 键 词：α-Fe_(2)O_(3) 铁精粉 纳米颗粒 晶粒尺寸 分散性 

分 类 号：TM273[一般工业技术—材料科学与工程]