关键词: 磁选预富集, 初级预富集, 初级预富集精矿细磨, 再富集, 悬浮磁化焙烧

Abstract: The iron grade of ANSTEEL eastern tailings is 10.64%， and the FeO content is 2.71%. Iron minerals are mainly in the form of hematite and a small amount of magnetite， and the iron minerals are finely disseminated and dissociation degree is relatively lower， which is difficult to obtain high quality iron concentrate in conventional beneficiation process. In order to solve the problem of development and utilization of the secondary resources， beneficiation test was conducted on a representative sample. The results show that using the primary pre-enrichment process by low intensity magnetic clinder rough concentrate-vertical ring high gradient high intensity magnetic separation process， the tailings yield rate is up to 49.48%， and the primary pre-enriched concentrate is obtained with iron grade of 16.24% and iron recovery rate of 78.54%. The primary pre-enriched concentrate with the grinding fineness of -0.043 mm accounted for 90%， and vertical ring low intensity magnetic rough concentration-vertical ring magnetic scavenging process to obtain the iron grade of 32.08% and iron recovery of 62.68% pre-enriched concentrate. The primary pre-enrichment process by low intensity magnetic separation 1 and vertical ring high gradient high intensity magnetic separation 1 and the primary pre-enrichment concentrate is ground finely and re-enriched using the low intensity magnetic separation 2 and vertical ring high gradient high intensity magnetic separation. The magnetic pre-enriched concentrate with iron grade of 32.08% and iron recovery of 62.68% can be obtained， and the tailing yield is 79.21%. This method effectively reduces the processing capacity of the subsequent roasting and deep selection system， thereby effectively reducing the subsequent production costs and providing technical support for the efficient utilization of secondary iron ore resources.

Key words: Magnetic pre-concentration, Primary pre-enrichment process, Fine grinding of primary pre-enriched concentrate, Re-enrichment, Suspension magnetic roasting