Red iron ore is the most common, and it is made for the biggest ball of iron ore in the iron-containing materials. Due to its different genesis, hematite has coarse-grained, meso-crystalline structures (such as specularite), fine-grained or earthy (such as earthy hematite). Its chemical formula is Fe 2 O 3 , and the theoretical iron content is 70%. Press crystallographic point of view, belongs to hematite Corundum, predominantly of the hexagonal lattice, and a variety of different mixing crystalline forms, crystalline forms such as flaky mica. Some hematite is weathered from magnetite, so it often retains a cubic shape.
Hematite has a density of 4.8 to 5.3 g/cm 3 and a different hardness. The hardness of the crystalline hematite is 5.5-6, and the hardness of the soil and powder is very low. The crystalline hematite appearance is steel grey or iron black. Generally, hematite is easier to reduce and break than magnetite.
The mined iron ore produced is 40%~60% iron, and the iron content is more than 52%~54%; the fine ore with particle size less than 5~8mm is used as sintering raw material. If the iron content is less than 52% or contains harmful impurities, it must be subjected to beneficiation treatment, generally by re-election method, magnetization roasting-magnetic separation method, flotation method or joint process industry to obtain high-grade hematite concentrate as Ball raw material.
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