弱磁性赤铁矿表面磁化研究

Study on Surface Magnetization of Weak Magnetic Hematite

通过调整矿浆pH值,添加铁离子,合成Fe_3O_4,使其吸附在赤铁矿表面,从而使赤铁矿表面磁化。进行了Fe^(2+)和Fe^(3+)离子的用量、两种离子的比值等条件试验。结果表明,在60℃时,磁化效果最好,当亚铁离子浓度0. 021 mol/L,氨水浓度1. 0 mol/L,恒温搅拌8 min,赤铁矿的磁选回收率由70. 86%提高到83. 39%。通过扫描电子显微镜等检测手段,发现有Fe_3O_4晶粒在赤铁矿表面生成,使赤铁矿磁化,通过XPS分析证明赤铁矿表面有粒子Fe_3O_4生成。

Synthesis of Fe3O4 through adjustment of ore pulp’s pH value,addition of iron ion,to make iron ion adsorbed on the surface of hematite,so that the surface magnetization of hematite can be realized. The condition experiment for dosage and ratio of Fe^2+ and Fe^3+ion is carried out. The results show,the magnetization effect is the best when the temperature is 60℃,the ferrous ion concentration is 0.021mol/L,the ammonia concentration is 1.0mol/L,thermostatic mixing for 8 min,the magnetic separation recovery rate of hematite is increased from 70. 86% to 83.39%. It is found that there is Fe3O4 grain generated on the surface of hematite through scanning electron microscope and the other measuring manners,which make the hematite magnetization,and it is proved that there is Fe3O4 particle generated on the surface of hematite through XPS analysis.