Abstract: To exploit and utilize a micro-fine magnetite ore from Qinghai, beneficiation tests were made on it. The results show that adoption of single magnetic separation can not obtain an iron concentrate grade of over 60% even if the ore is ground to 95%-500 mesh. The combined process of magnetic separation and reverse flotation can obtain an iron concentrate grading 60.11% at a recovery of 60.20%at a final grinding size of 80% -400 mesh, and an iron concentrate grading 67.42% at a recovery of 56.92% at a final grinding size of 95% -400 mesh.

Key words: Micro-fine magnetite ore, Magnetic separation, Reverse flotation