关键词: 筒式磁选机, 螺旋溜槽, 细筛, 磁选柱

Abstract: In order to make efficient use of a lean magnetite resource in Anshan area，aiming at the problems of large middle return，low separation efficiency and high operation cost for the original separation process，a magnetic-gravity combined separation process is proposed，which uses one-stage grinding and one-stage magnetic separation，one-stage magnetic separation concentrate via spiral chute gravity separa⁃ tion to obtain qualified concentrate，spiral chute gravity separation tailings secondary classification，two�stage grinding-magnetic separation，two-stage magnetic separation concentrate fine screening and grading， under-size as qualified concentrate，the over-size via magnetic separation column cleaning，first-stage magnetic separation tailings，second-stage magnetic separation tailings，magnetic separation column tail⁃ ings combined into total tailings. The iron grade of the final concentrate was 66.35%，the recovery rate was 79.88%，and the tailings grade was 10.41%. The laboratory test results show that the magnetic-gravity sepa⁃ ration process can obtain some qualified gravity concentrate in advance under the condition of coarse grind⁃ ing，and throw out some qualified tailings，reduce the load of the second stage mill，improve the processing capacity of the beneficiation equipment，simplify the process flow，reduce the cost of beneficiation，and im⁃ prove the economic benefit，which can provide technical reference for the efficient separation of similar lean magnetite.

Key words: drum magnetic separator, spiral chute, fine screen, magnetic separation column