How are the grades of iron ore mills located?
The above given only general standards, each manufacturer may have different requirements for some specific parameters, especially the size, also because of the need of ore blending, may need some non conventional iron ore.
Iron ore used for ironmaking (formerly called blast furnace ore)Ore into the furnace block requirements: generally 8 ~ 40mm.With iron ore ironmaking, according to slagging components pH can be divided into:Alkaline ore (CaO+MgO) / (SiO2+Al2O3) > 1.2;Self fluxing ore (CaO+MgO) / (SiO2+Al2O3) =0.8 ~ 1.2;Semi self fluxing ore (CaO+MgO) / (SiO2+Al2O3) =0.5 ~ 0.8;Acid ore (CaO+MgO) / (SiO2+Al2O3) < 0.5.The Bessemer iron ore raw steel is less than or equal to 0.03% PBasic open hearth steelmaking iron ore raw P = 0.03% ~ 0.18%The alkaline side blown converter steelmaking iron ore raw P = 0.2% ~ 0.8%Thomas iron ore P = 0.8% ~ 1.2%The ordinary cast iron ore raw P = 0.05% ~ 0.15%High phosphorus cast iron ore raw P = 0.15% ~ 0.6%
With the iron ore steel (formerly open hearth ore)Requirements for lump size of ore into furnace:With iron ore 50 ~ 250 mm open hearth;Iron ore for electric furnace 50~100 mm;Iron ore for converter 10~50 mm.The quality of ore used directly for steelmaking (for magnetite, hematite, brown iron ore).
