Abstract: It is an important mean for plants to decrease costs and increase efficiency by pre dry separation before grinding when dealing with lean magnetite ore.A new type dry separator for pre-separation of lean magnetite，hang magnetic dry separator was researched and developed by Anshan Jin Yufeng Beneficiation Technology Co.，Ltd.facing the problems of the gradually lean magnetite resources，and “concentrate are not really enriched and tailings cannot be discarded” when using conventional magnetic pulley for pre separation.On the basis of introduction about basic structure and working principle of hang magnetic dry separator，using two kinds lean magnetite ore as research object，and with hang magnetic dry separator and magnetic pulley as sorting equipment respectively，contrast experiments of dry pre-separation efficiency were conducted.Applications of hang magnetic dry separator in three mines were introduced.Both research and pilot experiments indicated that:hang dry separator has better iron recovery efficiency，can discard tailing more thoroughly，and tailings have lower content of magnetic iron.Thus，hang magnetic dry separator is a new high efficiency dry pre-separation device.

Key words: Lean magnetite ore, Prediscarding by magnetic separation, Hang magnetic dry separator, Magnetic pulley