• 综合利用 •

### 拜耳法高铁赤泥直接还原制备海绵铁的研究

1. 中南大学
• 出版日期:2009-03-14 发布日期:2012-01-30

### Study on the Sponge Iron Preparation by Direct Reduction of High Iron Red Mud by Bayer Process

Huang Zhucheng，Cai Lingbo，Zhang Yuanbo，Yang Yongbin，Jiang Tao

1. Central South University
• Online:2009-03-14 Published:2012-01-30

Abstract: The process of coal-based direct reduction-magnetic separation for producing sponge iron from ferric red mud can realize effective iron enrichment.In the reduction process, the generation of 2FeO·SiO2 and FeO·Al2O3 can hinder the reduction of the iron oxides in red mud.Pre-roasting can promote the reduction of red mud, but in the presence of additives, the effect of pre-roasting will not be so evident.When used as additives in the reduction process, Na2CO3 will produce basic oxides that can react with acidic oxides, and CaF2 can reduce the melting point and viscosity of compound generated through solid phase reaction, thus improving the reduction conditions.When 3% Na2CO3 and 3%CaF2 are added, at a reduction temperature of 1 150 ℃ and a reduction time of 3 h, sponge iron can be produced with a metallization rate of 92.79%, an iron grade of 89.57% and an iron recovery of 91.15%.