Abstract: The process of low intensity magnetic separation-high intensity magnetic separation-gravity separation was adopted to treat the low-grade mixing iron ore of Xinjiang Provicne, by which the iron concentrate grade reached 65%, but the recovery was only about 50%. Therefore, in order to improve the recovery, the beneficiation tests were carried out by the process of dry pre-concentration, low intensity magnetic separation-high intensity magnetic separation-reverse flotation. The test results showed that about 20% of the waste rocks were removed by the dry pre-concentration firstly. Then, the final concentrate graded at 65.25% with the recovery rate of 69.28%, which is higher by about 19% than that of on-site production.

Key words: Low-grade mixing iron ore, Dry concentration, Magnetic separation, Reverse flotation