Experimental study of dry preconcentration on ultralow-grade magnetite ores

The content of total iron is 14.64% and the magnetic iron only accounts for 47.88% of the total iron in an ultralow-grade iron mine inHebei,but its reserves is great.Magnetite is the main valuable mineral.The yield of the tailings reaches 68.32% by dry preconcentrationwith magnetic pulley,and the magnetic iron content of the tailings is 0.58%,whichthe recovery of the magnetic iron is above 90%.The interfusion of the wall rock will affect the recovery of the magnetic iron.The investigation provides the technical support for the reasonable exploitation of the ultralow-grade iron ores.