Abstract: Aiming at the problem of deteriorating ore characteristics of a concentrator in Anshan， based on the analysis of ore properties，the optimization test of beneficiation process flow was carried out. The results show that the iron grade of the ore is 28.11%. After crushing by high pressure grinding roll， the crushed product is subjected to wet combined pre-concentration process. With the magnetic induction intensity of low intensity magnetic separation is 250 mT，and the magnetic induction intensity of high in⁃ tensity magnetic separation is 1 000 mT，the pre-concentration concentrates with iron grade of 34.04% can be obtained，and the amount of primary grinding is reduced by 21.76%. At the same time，the iron grade of abandoned coarse tailings is 6.79%. The pre-selected concentrate was subjected to a combined process of grinding-magnetic separation-coarse and fine classification-gravity separation-flotation，a high�quality concentrate product with iron grade of 67.83% and metal recovery of 74.35% was obtained，and the comprehensive tailings grade was 10.42%.

Key words: high pressure ginding roller, low intensity magnetic and high intensity magnetic combined preconcentration, magnetic-gravity-flotation combined process