Deposits of comparatively lower grade iron ore that remain relatively untouched or bypassed, are now most important because of increase in consumer demands. Deposits of comparatively low grade specular hematite amenable to beneficiation by flotation have produced concentrates superior in grade to direct shipping ores.
Mineral Processing Experiment Research of Low Grade Magnetite ... Nie Yimiao, Niu Fusheng, Shao Fengjun. Experiment study on the beneficiation of a difficult ground magnetite ore. Mining Processing Equipment, 9(2010)101105. ... Study on Process Concentrating of a Certain Low Grade Hematite Ore .