Abstract: Suspension-type dry separator is a new type of dry pre-concentration equipment for magnetic iron ore self-developed by Dalian Haiqiao Science and Technology Co.，Ltd..It is adopted to make industrial tests on the dry tailings removal for the super lean magnetite of Chengde Baiquan iron ore.The results showed that compared with the CTG800×1400 magnetic pulley traditionally used in Baiquan Iron Mine, this equipment made tailings removal rate increased from 5.20% to 20.24%, ore grade for grinding increased from 0.50% to 1.12%, the content of magnetic iron in tailings decreased from 1.16% to 0.75%.Economic benefit analysis showed that 16 500 t more iron concentrate was produced each year by using this equipment, and the corresponding production value was increased by 16.5 million yuan a year according to the current price.

Key words: Ultra-low-grade magnetite, Suspension dry separator, Pre-concentration for tailings removal