Optimization of magnetic separation process for iron recovery from steel slag

• Published in: Journal of iron and steel research, international Vol. 24; no. 2; pp. 165 - 170
• Main Authors: Lan, Yuan-pei, Liu, Qing-cai, Meng, Fei, Niu, De-liang, Zhao, Heng
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.02.2017; Springer Singapore
• Subjects: Abrasion; Applied and Technical Physics; Engineering; Iron recovery; Machines; Magnetic separation; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Physical Chemistry; Processes; Recovery efficiency; Steel slag; 分离过程; 回收效率; 回收率; 工艺优化; 晶粒尺寸分布; 磁选; 磁铁; 钢渣处理; Iron recovery; Abrasion; Recovery efficiency; Magnetic separation; Steel slag
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(17)30023-7

To improve the efficiency of iron recovery from steel slag and reduce the wear-and-tear on facilities, a new method was proposed by adding a secondary screen sizer to the magnetic separation process according to grain size distribution of magnetic iron （M-Fe） in the slag. The final recycling efficiency was evaluated by calculating the percentage of recycled M-Fe to the maximum amount of M-Fe that could be recovered. Three types of slags, namely basic oxygen furnace slag, desul- furization slag, and iron ladle slag, were studied, and the results showed that the optimized re- covery efficieneies were 93.20%, 92. 48%, and 85.82% respectively, and the recycling efficien eies were improved by 9.58%, 7.11%, and 6.24% respectively. Furthermore, the abrasion between the mill equipment and the remaining slags was significantly reduced owing to the efficient recovery of larger M-Fe particles. In addition, the using amount of grinding balls was reduced by 0. 46 kg when every 1 t steel slag was processed.