There are mainly iron ore, coking coal, coke, power coal, rebar, wire rod, plate, ferrosilicon and manganese silicon.
Black five categories: coking coal, coke, thermal coal, iron ore and rebar.
black metal
Definition:
Ferrous metal materials are the general name of iron, chromium and manganese in industry. It also includes these three metals, especially alloy ferrous metal steel and steel. The opposite of ferrous metal is nonferrous metal. In fact, pure iron and chromium are silvery white, and manganese is silvery gray. Because the surface of steel is usually covered with a layer of black ferroferric oxide, manganese and chromium are mainly used to smelt black alloy steel. This is why it is "wrongly classified" as a black metal.
The classification of ferrous metals is also meaningful, because these three metals are the main raw materials for smelting steel, which occupies an extremely important position in the national economy and is also an important symbol to measure a country's national strength. The output of ferrous metals accounts for about 95% of the world's total metal output.
Mining terminology:
The names ferrous metal and nonferrous metal often make people misunderstand that ferrous metal must be black, but it is not. There are only five kinds of ferrous metals: iron, manganese, chromium, vanadium and titanium. And none of them are black! Pure iron is silvery white; Chromium is silvery white; Manganese is grayish white. Because the surface of iron often rusts, it is covered with a mixture of black ferroferric oxide and brown iron oxide, which looks black. So people call it "black metal". Usually referred to as "ferrous metallurgy industry", it mainly refers to the steel industry. Because the most common alloy steels are manganese steel and chromium steel, people regard manganese and chromium as "ferrous metals".
Except for iron, manganese, chromium, vanadium and titanium, all other metals are non-ferrous metals.
In nonferrous metals, there are various classification methods. For example, in terms of specific gravity, aluminum, magnesium, lithium, sodium, potassium and so on. Those whose specific gravity is less than 4.5 are called "light metals", while copper, zinc, nickel, mercury, tin, lead and so on. If the specific gravity is greater than 4.5, it is called "heavy metal". Gold, silver, platinum, osmium and iridium are more expensive and are called "precious metals"; Radium, uranium, thorium, polonium and technetium are radioactive and are called "radioactive metals"; There are also niobium, tantalum, zirconium, lutetium, gold, radium, hafnium and uranium.