Who knows what the melting points of hematite and limonite are?
Hematite hematite is anhydrous iron oxide ore, its chemical formula is Fe2O3, the theory of iron content of the ore 70%. often form huge deposits in nature, from the burial and exploitation, it is the main ore industrial production.Hematite iron content is generally 50% ~ 60%, containing harmful impurities, sulfur and phosphorus less, reduction is better than magnetite, therefore, hematite is a relatively good raw material for iron smelting
Limonite limonite is hydrous ferric oxide ore is generated by the other ore after weathering, the most widely distributed in nature, but the large amount of buried deposits is rare. Its chemical formula is nFe2O3mH2O (n=1 ~ 3, m=1 ~ 4). Limonite is actually composed of goethite (Fe2O3H2O), water goethite (2Fe2O3H2O) and iron oxide containing different water of crystallization and the mixture of argillaceous substances. The vast majority of limonite minerals containing iron exists in the form of 2Fe2O3H2O.
Hematite has primary, there are wild, magnetite hematite after oxidation regeneration after the loss of magnetic, but still retains the crystal shape of magnetite martite, in martite often contain some residual magnetite weathering products. Sometimes also contain some hematite hematite, such as limonite (2Fe2O33H2O).Hematite has semi metallic luster, crystalline hardness is 5.6, earthy hematite is very low hardness, no cleavage, relative density 4.5.3, only weakly magnetic, gangue silicate
General brown iron ore is 37% ~ 55%, sometimes higher phosphorus. Absorbent limonite is very strong, generally absorbed a lot of water, remove the free water and crystal water in or into the blast furnace after heating, thus increasing the ore porosity, which greatly improves the ore reduction. The reduction ratio of limonite of hematite and magnetite are better. At the same time, the removal of water corresponding increase iron ores.Because it is a mixture of melting point is not OK. The melting point of iron is 1534 degrees to 1200 degrees, iron general enough.
