Used for processing laboratory identification of fine-grained disseminated hematite, false hematite, limonite and siderite stone etc.. Some rare metal ore processing. The magnetic effect of large area, large capacity. The toothed plate for magnetic media, magnetic field intensity and magnetic field gradient. The low-grade iron ore experiments very effective. Choose good don't index. The manganese ore, beach placer, wolframite, tin, glass sand and phosphate ore selection of experiment, the effect is good, high index.