What kinds of iron ores are there? What is the color grid of ore?

Magnetite 1 is an oxidized iron ore, mainly composed of Fe3O4, which is a compound of Fe2O3 and FeO. Dark gray, with a specific gravity of about 5. 15, containing Fe72.4%% Fe and 27.6% O, which is magnetic.

Hematite is also an oxidized iron ore, the main component is Fe2O3, which is dark red, with a specific gravity of about 5.26, containing 70% Fe and 30% O, and is the most important iron ore.

Limonite This is an ore containing iron hydroxide. It is the floorboard of two different structures, goethite HFEO 2 and lepidolite FeO(OH). Someone wrote the chemical formula of its main component as MFE2O 3. NH2O, khaki or brown, contains about 62% iron, about 27% oxygen, H2O 1 1%, and its specific gravity is about 3.6.

Siderite is a kind of ore containing iron carbonate, the main component of which is FeCO3, with a bluish gray color and a specific gravity of about 3.8. Most of these ores contain a lot of calcium and magnesium salts. Because carbonate will absorb a lot of heat and release carbon dioxide at the high temperature of about 800 ~ 900℃, we usually roast this ore before adding it to the blast furnace.

5 silicate iron This iron ore is a kind of double salt, which has no certain chemical formula and its composition varies greatly. It is generally dark green, with a specific gravity of about 3.8 and a low iron content. This is an inferior iron ore.

6 Iron sulfide contains iron disulfide, only 46.6% iron and 53.4% sulfur .. It is grayish yellow, and its specific gravity is about 4.95 ~ 5. 10. Because this kind of ore often contains many other precious metals such as copper, nickel, zinc, gold and silver, it is often used as raw materials for other metal smelting industries. Because it contains a lot of sulfur, it is often used to extract sulfur, but iron has become a by-product, so it can't be called iron ore.